fscanf won't work twice? - c

I'm just trying to get fscanf to read all the characters in a file, along with all the words, but whenever I try to run a whileloop on the file I opened twice it doesn't seem to work? It only seems to be able to use fscanfon a file one time. I found a work around where I can scan the same file twice except I need to open the file a 2nd time for this to work. How can I use fscanf on the same instance of a file twice?
/*Description: Program will open a file named Story.txt
then counts the number of words and characters
and prints them out */
int main(){
char word[225]; // will be used to hold words (array of chars)
char c; // will be used to hold chars
int wordCount = 0; // will be used to hold the number of words in the file
int charCount = 0; // will be used to hold the number of chars in the file
FILE* wordFile = fopen("Story.txt","r"); // opens the file Story.txt for counting words
printf("Words: "); // indicates that the following outout will be the words of the file
while(fscanf(wordFile,"%s",&word)==1){ // a loop to scan the file for all the words in it until the end of the file
printf(" %s ",word); // prints out the word in the given cycle
wordCount = wordCount + 1; // keeps count of the words the loop has scanned up till now
}
fclose(wordFile); // closes wordFile and frees the memory
FILE* charFile = fopen("Story.txt","r"); // opens file Story.txt for counting chars
printf("\n\nChars: "); // indicates the following output will be the chars of the file
while(fscanf(charFile,"%c",&c)==1){ // a loop to scan the file for all the chars in it until the end fot he file
if(c!=' '){ // will check if the char is a space, if it is it will not count it
printf(" %c ",c); // prints out the char for the given cycle
charCount = charCount + 1; // keeps count of the chars the loop has scanned up till now
}
}
fclose(charFile); // closes charFile and frees the memory
printf("\n\nWord count: %d and Char count: %d",wordCount,charCount-1); // prints out the word count and char count
return 0;
}
As you can see i have to create two instances of the file or else it will not work. The first instance is called wordFile and the 2nd instance is called charFile. Here's the thing though: Both loops work, it's just that I can't use them on the same file twice. How can I make it so that I will only need to open one instance of the file and then use it to count both the words and the chars in it?
Things I tried: adding the space as suggested here didn't work: C: Multiple scanf's, when I enter in a value for one scanf it skips the second scanf (i searched fscanf but scanf is all that came up so i went off of that).
Another work around that I found strange: if i use wordFilein the 2nd while loop to search for chars it works, the only problem is I have to declare fclose(wordFile); right before it's used in the while loop. I thought fclosewas suppose to close the file and make it unusable? Anyways that worked but what I really want is to use use one instance of the file to read all the chars and strings in it.

Do something like below - the lazy way of course
char word[225];
char c;
int wordCount = 0;
int charCount = 0;
FILE* wordFile = fopen("Story.txt","r");
printf("Words: ");
while(fscanf(wordFile,"%s",word)==1){ // word gives the address not &word
wordCount = wordCount + 1;
}
printf("%d\n",wordCount);
fseek(wordFile,0,SEEK_SET); // setting the file pointer to point to the beginning of file
printf("Chars: ");
while(fscanf(wordFile,"%c",&c)==1){
if(c!=' '&& c!='\n' && c!='\t'){
charCount = charCount + 1;
}
}
printf("%d\n",charCount);
fclose(wordFile); // Closing the file once for all
return 0;

fscanf(wordFile,"%s",&word);
The variable "word" is the pointer to the first element of your array (string), so here you are scanning the address not the value. You should rather use:
fscanf(wordFile,"%s",word);

Related

Duplication in file handling output in C program [duplicate]

This question already has answers here:
Why is “while( !feof(file) )” always wrong?
(5 answers)
Closed 2 years ago.
I have this code that reads in values from a .txt file and returns the strings ending in ed.
It compiles and runs, but I can't figure out why it returns the last word twice. I thought it was the FEOF statement. Any hints or clues?
The program is supposed to prompt the user for the name of a text file (if the file does not exist, display an error message and re-prompt), this works.
Read in a series of strings from the text file and store these in an array of strings, dynamically allocating memory for each element, this works.
Loop through the populated string array and find elements that end with the characters "ed".
Display on-screen a list of only those strings that end with "ed", works but duplicates the last word.
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define SIZES_1 20 // preprpcessor directive for size of the filename array
#define SIZES_2 500 // preprocessor directive for size of the word array
// the file name needs to be a constant so that it is not changed
int readInData (const char *fileName, char* array[] ); // function protype with arguments making pointer to char that is a constant called filename,
// with pointer to an char array
// function main
int main(void){
char fileName[SIZES_1];
char *array[SIZES_2];
int i; // loop counter variable
int length; // length of current string
int N; //Size of filled array
int userPrompt=0; // used for signaling if file can be read correctly , default value is set to zero
// while loop to be used to as a signal with userPrompt to keep prompting user fro filename Prompt the user for the name of a text file
//(if the file does not exist, display an error message and re-prompt)
while (userPrompt==0){
puts("Please Input the Text file name (Max 20 characters): ");
scanf("%s", fileName);
if (-1 == (N = readInData(fileName,array))){// perform error check and if non pass to function
printf("File error try again.\n");
userPrompt=0; // keeps signal flag at 0
}
else
{
userPrompt=1;// sets flag to 1 and loop is exited
}
}// end of signal while loop
printf("\n the Following Strings end with ed: \n ");
// loop through
for (i = 0; i <= N; i++){
length = strlen(&array[i][0]); // strlen is used to f9ind the length of the string, address of array is used after trial error, array is a pointer start at i index 0
// compare and
if (strcmp(&array[i][length -2], "ed")==0){// compare the value at memory location and if last 2 letters are set return value to 0 then it is equal
printf("%s\n", &array[i][0]);// print the value at memory location
}
}
//free((array)); //deallocate memory from function malloc got error mesages until i used the double brackets
return 0;
}
int readInData (const char *fileName, char* array[] ){
char lineLth[SIZES_2];
int i =0;
int length;
// array for line length at 500 using defied size above.
FILE * cfPtr; // pointer to file stream called cfPtrlist
cfPtr = fopen(fileName,"r");// open file passed as argument to function to read only
if(!cfPtr) // i encapsulated in a bracket here and it threw an error
return -1; // return an error message to locate where the problem is i am useing this to see if file opening is still a problem
while (!feof(cfPtr)){ // while end of file signal is not reached
fscanf(cfPtr,"%s",lineLth);// scan in each line
length = strlen(lineLth);// find the length of the line ie the word
array[i] = (char*)malloc(length+1); //use +1 to allocate memory effectivly
strcpy(array[i], lineLth); // copy the string in the line ltth and pass
++i; // increment counter
}
fclose(cfPtr); // close file
return i;// return value
}
You output lineLth whether or not the call to fscanf succeeds. You need to process data only if you were successfully able to read data in. You can't use feof to predict whether or not a future operation will succeed. It's a status-reporting function that tells you about what worked in the past, not a prediction operation that tells you what will work in the future.

How to reverse text in a file in C?

I'm try to get my text to be read back to front and to be printed in the reverse order in that file, but my for loop doesn't seem to working. Also my while loop is counting 999 characters even though it should be 800 and something (can't remember exactly), I think it might be because there is an empty line between the two paragraphs but then again there are no characters there.
Here is my code for the two loops -:
/*Reversing the file*/
char please;
char work[800];
int r, count, characters3;
characters3 = 0;
count = 0;
r = 0;
fgets(work, 800, outputfile);
while (work[count] != NULL)
{
characters3++;
count++;
}
printf("The number of characters to be copied is-: %d", characters3);
for (characters3; characters3 >= 0; characters3--)
{
please = work[characters3];
work[r] = please;
r++;
}
fprintf(outputfile, "%s", work);
/*Closing all the file streams*/
fclose(firstfile);
fclose(secondfile);
fclose(outputfile);
/*Message to direct the user to where the files are*/
printf("\n Merged the first and second files into the output file
and reversed it! \n Check the outputfile text inside the Debug folder!");
There are a couple of huge conceptual flaws in your code.
The very first one is that you state that it "doesn't seem to [be] working" without saying why you think so. Just running your code reveals what the problem is: you do not get any output at all.
Here is why. You reverse your string, and so the terminating zero comes at the start of the new string. You then print that string – and it ends immediately at the first character.
Fix this by decreasing the start of the loop in characters3.
Next, why not print a few intermediate results? That way you can see what's happening.
string: [This is a test.
]
The number of characters to be copied is-: 15
result: [
.tset aa test.
]
Hey look, there seems to be a problem with the carriage return (it ends up at the start of the line), which is exactly what should happen – after all, it is part of the string – but more likely not what you intend to do.
Apart from that, you can clearly see that the reversing itself is not correct!
The problem now is that you are reading and writing from the same string:
please = work[characters3];
work[r] = please;
You write the character at the end into position #0, decrease the end and increase the start, and repeat until done. So, the second half of reading/writing starts copying the end characters back from the start into the end half again!
Two possible fixes: 1. read from one string and write to a new one, or 2. adjust the loop so it stops copying after 'half' is done (since you are doing two swaps per iteration, you only need to loop half the number of characters).
You also need to think more about what swapping means. As it is, your code overwrites a character in the string. To correctly swap two characters, you need to save one first in a temporary variable.
void reverse (FILE *f)
{
char please, why;
char work[800];
int r, count, characters3;
characters3 = 0;
count = 0;
r = 0;
fgets(work, 800, f);
printf ("string: [%s]\n", work);
while (work[count] != 0)
{
characters3++;
count++;
}
characters3--; /* do not count last zero */
characters3--; /* do not count the return */
printf("The number of characters to be copied is-: %d\n", characters3);
for (characters3; characters3 >= (count>>1); characters3--)
{
please = work[characters3];
why = work[r];
work[r] = please;
work[characters3] = why;
r++;
}
printf ("result: [%s]\n", work);
}
As a final note: you do not need to 'manually' count the number of characters, there is a function for that. All that's needed instead of the count loop is this;
characters3 = strlen(work);
Here's a complete and heavily commented function that will take in a filename to an existing file, open it, then reverse the file character-by-character. Several improvements/extensions could include:
Add an argument to adjust the maximum buffer size allowed.
Dynamically increase the buffer size as the input file exceeds the original memory.
Add a strategy for recovering the original contents if something goes wrong when writing the reversed characters back to the file.
// naming convention of l_ for local variable and p_ for pointers
// Returns 1 on success and 0 on failure
int reverse_file(char *filename) {
FILE *p_file = NULL;
// r+ enables read & write, preserves contents, starts pointer p_file at beginning of file, and will not create a
// new file if one doesn't exist. Consider a nested fopen(filename, "w+") if creation of a new file is desired.
p_file = fopen(filename, "r+");
// Exit with failure value if file was not opened successfully
if(p_file == NULL) {
perror("reverse_file() failed to open file.");
fclose(p_file);
return 0;
}
// Assumes entire file contents can be held in volatile memory using a buffer of size l_buffer_size * sizeof(char)
uint32_t l_buffer_size = 1024;
char l_buffer[l_buffer_size]; // buffer type is char to match fgetc() return type of int
// Cursor for moving within the l_buffer
int64_t l_buffer_cursor = 0;
// Temporary storage for current char from file
// fgetc() returns the character read as an unsigned char cast to an int or EOF on end of file or error.
int l_temp;
for (l_buffer_cursor = 0; (l_temp = fgetc(p_file)) != EOF; ++l_buffer_cursor) {
// Store the current char into our buffer in the original order from the file
l_buffer[l_buffer_cursor] = (char)l_temp; // explicitly typecast l_temp back down to signed char
// Verify our assumption that the file can completely fit in volatile memory <= l_buffer_size * sizeof(char)
// is still valid. Return an error otherwise.
if (l_buffer_cursor >= l_buffer_size) {
fprintf(stderr, "reverse_file() in memory buffer size of %u char exceeded. %s is too large.\n",
l_buffer_size, filename);
fclose(p_file);
return 0;
}
}
// At the conclusion of the for loop, l_buffer contains a copy of the file in memory and l_buffer_cursor points
// to the index 1 past the final char read in from the file. Thus, ensure the final char in the file is a
// terminating symbol and decrement l_buffer_cursor by 1 before proceeding.
fputc('\0', p_file);
--l_buffer_cursor;
// To reverse the file contents, reset the p_file cursor to the beginning of the file then write data to the file by
// reading from l_buffer in reverse order by decrementing l_buffer_cursor.
// NOTE: A less verbose/safe alternative to fseek is: rewind(p_file);
if ( fseek(p_file, 0, SEEK_SET) != 0 ) {
return 0;
}
for (l_temp = 0; l_buffer_cursor >= 0; --l_buffer_cursor) {
l_temp = fputc(l_buffer[l_buffer_cursor], p_file); // write buffered char to the file, advance f_open pointer
if (l_temp == EOF) {
fprintf(stderr, "reverse_file() failed to write %c at index %lu back to the file %s.\n",
l_buffer[l_buffer_cursor], l_buffer_cursor, filename);
}
}
fclose(p_file);
return 1;
}

How to read in the last word in a text file and into another text file in C?

SO i'm supposed to write a block of code that opens a file called "words" and writes the last word in the file to a file called "lastword". This is what I have so far:
FILE *f;
FILE *fp;
char string1[100];
f = fopen("words","w");
fp=fopen("lastword", "w");
fscanf(f,
fclose(fp)
fclose(f);
The problem here is that I don't know how to read in the last word of the text file. How would I know which word is the last word?
This is similar to what the tail tool does, you seek to a certain offset from the end of the file and read the block there, then search backwards, once you meet a whitespace or a new line, you can print the word from there, that is the last word. The basic code looks like this:
char string[1024];
char *last;
f = fopen("words","r");
fseek(f, SEEK_END, 1024);
size_t nread = fread(string, 1, sizeof string, f);
for (int I = 0; I < nread; I++) {
if (isspace(string[nread - 1 - I])) {
last = string[nread - I];
}
}
fprintf(fp, "%s", last);
If the word boundary is not find the first block, you continue to read the second last block and search in it, and the third, until your find it, then print all the characters after than position.
There are plenty of ways to do this.
Easy way
One easy approach would be to to loop on reading words:
f = fopen("words.txt","r"); // attention !! open in "r" mode !!
...
int rc;
do {
rc=fscanf(f, "%99s", string1); // attempt to read
} while (rc==1 && !feof(f)); // while it's successfull.
... // here string1 contains the last successfull string read
However this takes a word as any combination of characters separated by space. Note the use of the with filed in the scanf() format to make sure that there will be no buffer overflow.
More exact way
Building on previous attempt, if you want a stricter definition of words, you can just replace the call to scanf() with a function of your own:
rc=read_word(f, string1, 100);
The function would be something like:
int read_word(FILE *fp, char *s, int szmax) {
int started=0, c;
while ((c=fgetc(fp))!=EOF && szmax>1) {
if (isalpha(c)) { // copy only alphabetic chars to sring
started=1;
*s++=c;
szmax--;
}
else if (started) // first char after the alphabetics
break; // will end the word.
}
if (started)
*s=0; // if we have found a word, we end it.
return started;
}

How would I compare a string (entered by the user) to the first word of a line in a file?

I am really struggling to understand how character arrays work in C. This seems like something that should be really simple, but I do not know what function to use, or how to use it.
I want the user to enter a string, and I want to iterate through a text file, comparing this string to the first word of each line in the file.
By "word" here, I mean substring that consists of characters that aren't blanks.
Help is greatly appreciated!
Edit:
To be more clear, I want to take a single input and search for it in a database of the form of a text file. I know that if it is in the database, it will be the first word of a line, since that is how to database is formatted. I suppose I COULD iterate through every single word of the database, but this seems less efficient.
After finding the input in the database, I need to access the two words that follow it (on the same line) to achieve the program's ultimate goal (which is computational in nature)
Here is some code that will do what you are asking. I think it will help you understand how string functions work a little better. Note - I did not make many assumptions about how well conditioned the input and text file are, so there is a fair bit of code for removing whitespace from the input, and for checking that the match is truly "the first word", and not "the first part of the first word". So this code will not match the input "hello" to the line "helloworld 123 234" but it will match to "hello world 123 234". Note also that it is currently case sensitive.
#include <stdio.h>
#include <string.h>
int main(void) {
char buf[100]; // declare space for the input string
FILE *fp; // pointer to the text file
char fileBuf[256]; // space to keep a line from the file
int ii, ll;
printf("give a word to check:\n");
fgets(buf, 100, stdin); // fgets prevents you reading in a string longer than buffer
printf("you entered: %s\n", buf); // check we read correctly
// see (for debug) if there are any odd characters:
printf("In hex, that is ");
ll = strlen(buf);
for(ii = 0; ii < ll; ii++) printf("%2X ", buf[ii]);
printf("\n");
// probably see a carriage return - depends on OS. Get rid of it!
// note I could have used the result that ii is strlen(but) but
// that makes the code harder to understand
for(ii = strlen(buf) - 1; ii >=0; ii--) {
if (isspace(buf[ii])) buf[ii]='\0';
}
// open the file:
if((fp=fopen("myFile.txt", "r"))==NULL) {
printf("cannot open file!\n");
return 0;
}
while( fgets(fileBuf, 256, fp) ) { // read in one line at a time until eof
printf("line read: %s", fileBuf); // show we read it correctly
// find whitespace: we need to keep only the first word.
ii = 0;
while(!isspace(fileBuf[ii]) && ii < 255) ii++;
// now compare input string with first word from input file:
if (strlen(buf)==ii && strstr(fileBuf, buf) == fileBuf) {
printf("found a matching line: %s\n", fileBuf);
break;
}
}
// when you get here, fileBuf will contain the line you are interested in
// the second and third word of the line are what you are really after.
}
Your recent update states that the file is really a database, in which you are looking for a word. This is very important.
If you have enough memory to hold the whole database, you should do just that (read the whole database and arrange it for efficient searching), so you should probably not ask about searching in a file.
Good database designs involve data structures like trie and hash table. But for a start, you could use the most basic improvement of the database - holding the words in alphabetical order (use the somewhat tricky qsort function to achieve that).
struct Database
{
size_t count;
struct Entry // not sure about C syntax here; I usually code in C++; sorry
{
char *word;
char *explanation;
} *entries;
};
char *find_explanation_of_word(struct Database* db, char *word)
{
for (size_t i = 0; i < db->count; i++)
{
int result = strcmp(db->entries[i].word, word);
if (result == 0)
return db->entries[i].explanation;
else if (result > 0)
break; // if the database is sorted, this means word is not found
}
return NULL; // not found
}
If your database is too big to hold in memory, you should use a trie that holds just the beginnings of the words in the database; for each beginning of a word, have a file offset at which to start scanning the file.
char* find_explanation_in_file(FILE *f, long offset, char *word)
{
fseek(f, offset, SEEK_SET);
char line[100]; // 100 should be greater than max line in file
while (line, sizeof(line), f)
{
char *word_in_file = strtok(line, " ");
char *explanation = strtok(NULL, "");
int result = strcmp(word_in_file, word);
if (result == 0)
return explanation;
else if (result > 0)
break;
}
return NULL; // not found
}
I think what you need is fseek().
1) Pre-process the database file as follows. Find out the positions of all the '\n' (carriage returns), and store them in array, say a, so that you know that ith line starts at a[i]th character from the beginning of the file.
2) fseek() is a library function in stdio.h, and works as given here. So, when you need to process an input string, just start from the start of the file, and check the first word, only at the stored positions in the array a. To do that:
fseek(inFile , a[i] , SEEK_SET);
and then
fscanf(inFile, "%s %s %s", yourFirstWordHere, secondWord, thirdWord);
for checking the ith line.
Or, more efficiently, you could use:
fseek ( inFile , a[i]-a[i-1] , SEEK_CURR )
Explanation: What fseek() does is, it sets the read/write position indicator associated with the file at the desired position. So, if you know at which point you need to read or write, you can just go there and read directly or write directly. This way, you won't need to read whole lines just to get first three words.

Char array must be bigger than necessary

Let's say I'm reading in numbers from a text file. The text file consists of one-hundred fifty digit numbers (those are separate, there are 100 instances of 50 digit numbers).
I wanted to save each number as a row of a 2D array. To do this, I declared an array
char input[99][50] //50 columns to utilize the newlines in the text file
But it wouldn't read in the entire text file, even though, it seemed to me, it was the right size. It read in through the 99th number. For the 100th line, it printed a newline then a bunch of garbage symbols, etc. Please see the following:
#include <stdio.h>
#include <stdlib.h>
int main(void)
{
//Set up the use of the input text file
FILE * ifp;
ifp = fopen("input.txt", "r");
//Declare variables
char input[100][50]; //Array to hold the input numbers
int i, j; //Variables to work with loops
//Begin by reading in the input file as characters,
//otherwise fscanf will take each entire line as
//a single number
for (i = 0; i <= 99; i++)
{
printf("%d)", i);
for (j = 0; j <= 50; j++)
{
fscanf(ifp, "%c", &input[i][j]);
printf("%c", input[i][j]);
}
}
system("pause");
return 0;
}
This will print it correctly. The thing that seems weird to me, is that it doesn't actually need to use that extra row that solves the problem...fscanf still only functions for the same range as before (0-99).
So...why does the array need to be [100]x[50]? Why does [99]x[50] cause so many issues?
Also, I added a newline to the last line of the text file because if I didn't, instead of a newline it printed an apostrophe ' to the screen at the end of the last line. Is this the symbol for some sort of end of file character?
Thanks in advance!
By the way, if you're interested in compiling this and seeing it happen, here's the text file input.txt:
37107287533902102798797998220837590246510135740250
46376937677490009712648124896970078050417018260538
74324986199524741059474233309513058123726617309629
91942213363574161572522430563301811072406154908250
23067588207539346171171980310421047513778063246676
89261670696623633820136378418383684178734361726757
28112879812849979408065481931592621691275889832738
44274228917432520321923589422876796487670272189318
47451445736001306439091167216856844588711603153276
70386486105843025439939619828917593665686757934951
62176457141856560629502157223196586755079324193331
64906352462741904929101432445813822663347944758178
92575867718337217661963751590579239728245598838407
58203565325359399008402633568948830189458628227828
80181199384826282014278194139940567587151170094390
35398664372827112653829987240784473053190104293586
86515506006295864861532075273371959191420517255829
71693888707715466499115593487603532921714970056938
54370070576826684624621495650076471787294438377604
53282654108756828443191190634694037855217779295145
36123272525000296071075082563815656710885258350721
45876576172410976447339110607218265236877223636045
17423706905851860660448207621209813287860733969412
81142660418086830619328460811191061556940512689692
51934325451728388641918047049293215058642563049483
62467221648435076201727918039944693004732956340691
15732444386908125794514089057706229429197107928209
55037687525678773091862540744969844508330393682126
18336384825330154686196124348767681297534375946515
80386287592878490201521685554828717201219257766954
78182833757993103614740356856449095527097864797581
16726320100436897842553539920931837441497806860984
48403098129077791799088218795327364475675590848030
87086987551392711854517078544161852424320693150332
59959406895756536782107074926966537676326235447210
69793950679652694742597709739166693763042633987085
41052684708299085211399427365734116182760315001271
65378607361501080857009149939512557028198746004375
35829035317434717326932123578154982629742552737307
94953759765105305946966067683156574377167401875275
88902802571733229619176668713819931811048770190271
25267680276078003013678680992525463401061632866526
36270218540497705585629946580636237993140746255962
24074486908231174977792365466257246923322810917141
91430288197103288597806669760892938638285025333403
34413065578016127815921815005561868836468420090470
23053081172816430487623791969842487255036638784583
11487696932154902810424020138335124462181441773470
63783299490636259666498587618221225225512486764533
67720186971698544312419572409913959008952310058822
95548255300263520781532296796249481641953868218774
76085327132285723110424803456124867697064507995236
37774242535411291684276865538926205024910326572967
23701913275725675285653248258265463092207058596522
29798860272258331913126375147341994889534765745501
18495701454879288984856827726077713721403798879715
38298203783031473527721580348144513491373226651381
34829543829199918180278916522431027392251122869539
40957953066405232632538044100059654939159879593635
29746152185502371307642255121183693803580388584903
41698116222072977186158236678424689157993532961922
62467957194401269043877107275048102390895523597457
23189706772547915061505504953922979530901129967519
86188088225875314529584099251203829009407770775672
11306739708304724483816533873502340845647058077308
82959174767140363198008187129011875491310547126581
97623331044818386269515456334926366572897563400500
42846280183517070527831839425882145521227251250327
55121603546981200581762165212827652751691296897789
32238195734329339946437501907836945765883352399886
75506164965184775180738168837861091527357929701337
62177842752192623401942399639168044983993173312731
32924185707147349566916674687634660915035914677504
99518671430235219628894890102423325116913619626622
73267460800591547471830798392868535206946944540724
76841822524674417161514036427982273348055556214818
97142617910342598647204516893989422179826088076852
87783646182799346313767754307809363333018982642090
10848802521674670883215120185883543223812876952786
71329612474782464538636993009049310363619763878039
62184073572399794223406235393808339651327408011116
66627891981488087797941876876144230030984490851411
60661826293682836764744779239180335110989069790714
85786944089552990653640447425576083659976645795096
66024396409905389607120198219976047599490197230297
64913982680032973156037120041377903785566085089252
16730939319872750275468906903707539413042652315011
94809377245048795150954100921645863754710598436791
78639167021187492431995700641917969777599028300699
15368713711936614952811305876380278410754449733078
40789923115535562561142322423255033685442488917353
44889911501440648020369068063960672322193204149535
41503128880339536053299340368006977710650566631954
81234880673210146739058568557934581403627822703280
82616570773948327592232845941706525094512325230608
22918802058777319719839450180888072429661980811197
77158542502016545090413245809786882778948721859617
72107838435069186155435662884062257473692284509516
20849603980134001723930671666823555245252804609722
53503534226472524250874054075591789781264330331690
So...why does the array need to be [100]x[50]? Why does [99]x[50]
cause so many issues?
100 is the size you allocate, the indices go from 0 to 99 (99 + 1 = 100 ).
When you only allocate 99 you're missing the last line.
Since you're using a C string to handle the fifty digits, you have to get 1 extra char to terminate the string.
char input[100][51];
for (int i = 0; i != 100; ++i) /* 100 entries */
{
/* read your 50 digits normally here */
input[i][50] = '\0'; /* remember to terminate the string */
}

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