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I want to give input as line number and get output as the corresponding text for that line number in a text file.
Sample text file:
Hi this is Stefen
Hi How are you
Example input:
Enter the line number:2
Expected Output:
Hi How are you
My program is:
#include <stdio.h>
#include <stdlib.h>
int main() {
FILE *fp;
fp = fopen("sample.txt", "r");
if (fp == NULL) {
perror("Unable to open the file\n");
exit(1);
}
char buf[256];
while (fgets(buf, sizeof(buf), fp) != NULL) {
printf("%s\n", buf);
print("~~~~\n");
}
fclose(fp);
return 0;
}
Output I got:(The entire file with the separator ~~~~ below each line)
Hi this is Stefen
~~~~
Hi How are you
~~~~
Can anyone please tell me how to do this?
As pmg suggests, would you please try the following:
#include <stdio.h>
#include <stdlib.h>
#define INFILE "sample.txt"
int main()
{
FILE *fp;
char buf[BUFSIZ];
int count = 0, n;
fp = fopen(INFILE, "r");
if (fp == NULL) {
perror(INFILE);
exit(1);
}
printf("Enter the line number: ");
fgets(buf, sizeof buf, stdin);
n = (int)strtol(buf, (char **)NULL, 10);
while (fgets(buf, sizeof buf , fp) != NULL){
if (++count == n) {
printf("%s", buf);
break;
}
}
fclose(fp);
return EXIT_SUCCESS;
}
Best to use a second file
check if you're at \n that means new line and increment a variable like "line"
printf(" \n Enter line number of the line to be deleted:");
scanf("%d", &delete_line);
//open new file in write mode
ptr2 = fopen("c:\\CTEMP\\newfile.txt", "w");
if(ptr2==NULL)
printf("second error opening newfile");
while (!feof(ptr1))
{
ch = fgetc(ptr1);
if (ch == '\n')
{
temp++;
}
//except the line to be deleted
if (temp != delete_line)
{
//copy all lines in file newfile.c
fputc(ch, ptr2);
}
}
fclose(ptr1);
fclose(ptr2);
"detele_line" variable is for the user to inter.
The easiest way is using array to save the lines, then print the certain line.
#include <stdio.h>
#define M 10010
#define N 256
char buf[M][N];
int main(){
FILE *file;
char fileName[50] = "sample.txt";
file = fopen(fileName, "r");
if(file == NULL)
return 1;
int n = 0;
while(fgets(buf[n], N, file) != NULL){
n++;
}
fclose(file);
int i, x;
printf("Example input:\nEnter the line number:");
scanf("%d", &x);
printf("Expected Output:\n%s", buf[x-1]);
return 0;
}
** Updated 26/10 -> First of all thank you all for you help, I am getting closer now, I need more work and studying but I really appreciate you are helping me a lot :-)
Still don't know why the first "rain" word in the input.txt file is not getting the positive output from strcmp, and from the cmd I can see the "<" bracket don't appear except for the LAST line which is the line that works.
Also checked the highlighted response from Removing trailing newline character from fgets() input
and even if I change the code to the following:
while( fgets (line, sizeof line, fp)!=NULL ) {
/* remove \n from at the end of the str buffer*/
char * pos;
/*
if ((pos = strchr(line, '\n')) != NULL)
*pos = '\0';
*/
line[strcspn(line, "\n")] = 0;
I get the same result as if I use the if block instead. Maybe I'm getting extra \0 which might be the case. Anyone has a link where I can read about the delimiters I just used, or a nice reference of a debugger, etc. ... which I will have a look as soon as I come here? Thank you so much in advance!
read5.c version: Now from that input.txt file, it had an extra space on the last "rain" word, I removed the space, and it was able to find and get that last word compare as a true result, running in the strcmp if block. but that was the only string that was a true positive result from that if block.
on the cmd I can see:
$./read5 input.txt rain output.txt sun
>Maria
>rain
>manel
>Bla bla
<rain>
Found it! rain
On the output.txt it becomes:
Maria
rain
manel
Bla bla
sun
read5.c
#include <stdio.h>
#include <string.h>
/**
* Compile program:
* gcc read3.c -o read3
*
*/
int main (int argc, char **argv) {
FILE *fp, *fo;
char *compare, *replace;
char line[246];
if (argc <= 4){
printf(">Missing arguments on the command line.\n");
printf(">Be sure you run the program as\n\"./read3 input.txt compare outout.txt replace\"\n\n");
}
/* opening file for reading */
fp = fopen(argv[1] , "r");
if(fp == NULL){
perror("Error opening input file");
return 1;
}
compare = argv[2];
fo = fopen(argv[3], "w");
if(fo == NULL){
perror("Error opening output file");
return 1; //TODO check if: return 1 because it was expected, right?
}
replace = argv[4];
/*
printf(); made to test version 2
//printf("We are going to compare %s\n", compare);
//printf("We are going to replace it with %s\n", replace);
*/
while( fgets (line, sizeof line, fp)!=NULL ) {
/* remove \n from at the end of the str buffer*/
char * pos;
if ((pos = strchr(line, '\n')) != NULL)
*pos = '\0';
/* print str enclosed in <> so we can see what str actually contains */
//printf("Inside the loop, got the string: %s\n", line);
//printing the strings with defined delimiters
printf("<%s>\n", line);
if(strcmp(compare, line) == 0){
printf("Found it! %s \n", line);
fprintf(fo, "%s\n", replace);
}
else{
fprintf(fo, "%s\n", line);
}
}
fclose(fp);
fclose(fo);
return 0;
}
First question with no edits: 25/10
I need to make a program that is run like this:
./read2 input.txt rain output.txt sun
It reads the input.txt, searches for rain string and if finds it, replaces it with sun string and outputs all the text from input.txt with the replacements to the output.txt.
But with the code that I have so far, the strcmp is not comparing the strings I want, maybe it has the extra space that I get on the command line, I don't know... for now what is doing is copying everything from input.txt to output.txt... It's running the else block always...
Read2.c:
#include <stdio.h>
#include <string.h>
int main(int argc, char **argv) {
FILE *fp, *fo;
char str[60];
//char* token;
/* opening file for reading */
fp = fopen(argv[1], "r");
char *compare = argv[2];
fo = fopen(argv[3], "w+");
char *replace = argv[4];
if (fp == NULL) {
perror("Error opening file");
return(-1);
}
//printf("We are going to compare %s\n", compare);
//printf("We are going to replace it with %s\n", replace);
while (fgets(str, 60, fp) != NULL) {
/* writing content to stdout */
//Take the \n out
//token = strtok(str, "\n");
printf("Inside the loop, got the string: %s\n", str);
if (strcmp(compare, str) == 0) {
//puts(str);
printf("Found it! %s \n", str);
fprintf(fo, "%s", replace);
} else {
fprintf(fo, "%s", str);
}
}
fclose(fp);
return(0);
}
input.txt:
Maria
rain
manel
Bla bla
rain
Ouput.txt becomes exactly as input.txt and before it was empty, so the code is working, except the if block that tests with strcmp.
The problem is the \n at the end of the str buffer. fgets adds the \n at end end of the line it reads, you need to get rid of it before comparing.
This is what you need:
while (fgets(str, 60, fp) != NULL) {
/* remove \n from at the end of the str buffer*/
char *pos;
if ((pos = strchr(str, '\n')) != NULL)
*pos = '\0';
/* print str enclosed in <> so we can see what str actually contains */
printf("Inside the loop, got the string: <%s>\n", str);
if (strcmp(compare, str) == 0) {
printf("Found it! %s\n", str);
fprintf(fo, "%s\n", replace);
}
else {
fprintf(fo, "%s\n", str);
}
}
Look at the comments in the code for explanations.
read.c
#include <stdio.h>
#include <string.h>
/**
* How to compile program:
* gcc read.c -o read
*
* How to run the program:
* .> ./read input.txt rainy output.txt sunny
* (On Windows MinGW compiler, simply:
* .> read input.txt rainy output.txt sunny - without ./)
*
*/
int main (int argc, char **argv) {
FILE *fp, *fo;
char *compare, *replace;
char line[246];
if (argc <= 4){
printf(">Missing arguments on the command line.\n");
printf(">Be sure you run the program as\n\"./read input.txt compare outout.txt replace\"\n\n");
}
/* Opening files for reading */
fp = fopen(argv[1] , "r");
if(fp == NULL){
perror("Error opening input file");
return 1;
}
compare = argv[2];
fo = fopen(argv[3], "w");
if(fo == NULL){
perror("Error opening output file");
return 1;
}
replace = argv[4];
while( fgets (line, (sizeof line), fp)!=NULL ) {
line[strcspn(line, "\n")] = 0;
if(strcmp(compare, line) == 0){
printf("Found it! %s \n", line);
fprintf(fo, "%s\n", replace);
}
else{
fprintf(fo, "%s\n", line);
}
}
fclose(fp);
fclose(fo);
return 0;
}
/*
Important info
strcspn ::
Locate first occurrence of character in string,
after locating the first occurrence of \n, replaces it by 0.
Sources::
https://stackoverflow.com/questions/2693776/removing-trailing-newline-character-from-fgets-input/28462221#28462221
Used to debug:
.>printf("1st: Reads input.txt, removes '\\n' from fgets, and prints it \n");
.>printf("2nd: Compares each line with 'rainy' \n");
.>printf("<%s>\n", line);
*/
input.txt
cloudy
rainy
chilly
rainy
rainy
Your approach fails because the lines read from the input file contain a trailing newline '\n' that makes the comparison return non zero.
You can strip the newline before comparing with the search string.
Note that there are other problems:
you should verify that enough command line arguments have been passed by testing argc > 4.
there is no need to open the output file in update mode "w+", "w" is simpler and better.
60 bytes is a bit small for the line array, limiting the longest line handled correctly to 58 bytes.
Here is an improved version:
#include <stdio.h>
#include <string.h>
int main(int argc, char **argv) {
FILE *fp, *fo;
char *compare, *replace;
char line[256];
if (argc <= 4) {
printf("missing command line arguments\n");
return 1;
}
fp = fopen(argv[1], "r");
if (fp == NULL) {
perror("Error opening input file");
return 1;
}
compare = argv[2];
fo = fopen(argv[3], "w");
if (fo == NULL) {
perror("Error opening output file");
return 1;
}
replace = argv[4];
while (fgets(line, sizeof line, fp) != NULL) {
line[strcspn(line, "\n")] = '\0';
if (strcmp(line, compare) == 0) {
printf("fount it!);
fprintf(fo, "%s\n", replace);
} else {
fprintf(fo, "%s\n", line);
}
}
fclose(fp);
fclose(fo);
return 0;
}
Note that long lines will be broken into chunks that fit in the line array, so there may be false positives with the above naive approach.
You can remove this limitation completely with this inner loop:
int c;
int pos = 0;
int cmplen = strlen(compare);
for (;;) {
c = getc(fp);
if (c == '\n' || c == EOF) {
if (pos == cmplen) {
fprintf(fo, "%s", replace);
} else
if (pos > 0) {
fprintf(fo, "%*s", pos, compare);
}
pos = 0;
if (c == EOF)
break;
} else {
if (pos >= 0) {
if (compare[pos] == (char)c) {
pos++;
continue;
}
if (pos > 0) {
fprintf(fo, "%*s", pos, compare);
}
pos = -1;
}
}
putc(c, fo);
}
Supposing that I have two files like this:
file1.txt
john
is
the new
guy
file2.txt
man
the old
is
rick
cat
dog
I'd like to compare first line from file1 with all the lines from file2 and verify if it exist. If not, go two the second line from file1 and compare it with all the lines from file2.. and so on until eof is reached by file1.
The output that I expect is:
john
the new
guy
How I thought this should be done:
read file1 and file2
create a function which returns the line number of each of them
take the first line from file1 and compare it to all the lines from file2
do this until all the lines from file1 are wasted
Now, I don't know what I'm doing wrong, but I don't get the result that I expect:
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
int countlines(char *filename)
{
int ch = 0, lines = 0;
FILE *fp = fopen(filename, "r");
if (fp == NULL)
return 0;
do {
ch = fgetc(fp);
if (ch == '\n')
lines++;
} while (ch != EOF);
if (ch != '\n' && lines != 0)
lines++;
fclose(fp);
return lines;
}
int main(int argc, char *argv[])
{
FILE *template_file = fopen(argv[1], "r");
FILE *data_file = fopen(argv[2], "r");
char buffer_line_template_file[100];
char buffer_line_data_file[100];
if (argc != 3)
{
perror("You didn't insert all the arguments!\n\n");
exit(EXIT_FAILURE);
}
if (template_file == NULL || data_file == NULL)
{
perror("Error while opening the file!\n\n");
exit(EXIT_FAILURE);
}
int counter = 0;
for (int i = 0; i < countlines(argv[1]); i++)
{
fgets(buffer_line_template_file, 100, template_file);
for (int j = 0; j < countlines(argv[2]); j++)
{
fgets(buffer_line_data_file, 100, data_file);
if (strcmp(buffer_line_template_file, buffer_line_data_file) != 0)
{
counter++;
printf("%d", counter);
}
}
}
printf("\n\n");
return 0;
}
Could someone please point me into the right direction ? For testing purposes I created a counter at the end which was a part of a small debug. There should be the print() function
As per #chux answer I got the following simplified code:
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
int main(int argc, char *argv[])
{
FILE *template_file = fopen(argv[1], "r");
FILE *data_file = fopen(argv[2], "r");
char buffer_line_template_file[100];
char buffer_line_data_file[100];
if (argc != 3)
{
perror("You didn't insert all the arguments!\n\n");
exit(EXIT_FAILURE);
}
if (template_file == NULL || data_file == NULL)
{
perror("Error while opening the file!\n\n");
exit(EXIT_FAILURE);
}
while(fgets(buffer_line_template_file, 100, template_file))
{
buffer_line_template_file[strcspn(buffer_line_template_file, "\n")] = '\0';
rewind(data_file);
while (fgets(buffer_line_data_file, 100, data_file))
{
buffer_line_data_file[strcspn(buffer_line_data_file, "\n")] = '\0';
if (strcmp(buffer_line_template_file, buffer_line_data_file) != 0)
{
printf("%s\n", buffer_line_template_file);
}
}
}
printf("\n\n");
return 0;
}
The above code is giving me the following output, which is not what is expected:
john
john
john
john
john
john
is
is
is
is
is
the new
the new
the new
the new
the new
the new
guy
guy
guy
guy
guy
guy
Problems with OP's code
Imprecise definition of line.
Excessive recalculation
Fuzzy determination of the number of lines in a file.
Unlike string, which has a precise definition in C, reading a line is not so well defined. The primary specificity issue: does a line contain the trailing '\n'. If the first answer is Yes, then does the last text in a file after a '\n' constitute a line? (Excessively long lines are another issue, but let us not deal with that today.)
Thus possibly some lines end with '\n' and others do not, fooling strcmp("dog", "dog\n").
The easiest solution is to read a line until either 1) a '\n' is encountered, 2) EOF occurs or 3) line buffer is full. Then after getting a line, lop off the potential trailing '\n'.
Now all lines code subsequently works with have no '\n'.
fgets(buffer_line_template_file, 100, template_file);
buffer_line_template_file[strcspn(buffer_line_template_file, "\n")] = '\0';
OP's loop is incredible wasteful. Consider a file with 1000 lines. Code will loop, calling 1000 times countlines() (each countlines() call reads 1000 lines) times when one countlines() call would suffice.
// for (int j = 0; j < countlines(argv[2]); j++)
int j_limit = countlines(argv[2]);
for (int j = 0; j < j_limit; j++)
There really is no need to count the line anyways, just continue until EOF (fgets() returns NULL). So no need to fix its fuzzy definition. (fuzzy-ness concerns same issues as #1)
int counter = 0;
for (fgets(buffer_line_template_file, 100, template_file)) {
buffer_line_template_file[strcspn(buffer_line_template_file, "\n")] = '\0';
rewind(data_file);
while ((fgets(buffer_line_data_file, 100, data_file)) {
buffer_line_data_file[strcspn(buffer_line_data_file, "\n")] = '\0';
if (strcmp(buffer_line_template_file, buffer_line_data_file) != 0) {
counter++;
printf("%d", counter);
}
}
}
Other simplifications possible - for another day.
FWIW, following counts lines of text allowing the last line in the file to optionally end with a '\n'.
unsigned long long FileLineCount(FILE *istream) {
unsigned long long LineCount = 0;
rewind(istream);
int previous = '\n';
int ch;
while ((ch = fgetc(inf)) != EOF) {
if (previous == '\n') LineCount++;
previous = ch;
}
return LineCount;
}
Note that this function may get a different result that fgets() calls. Consider a file of one line of 150 characters. fgets(..., 100,...) will report 2 lines. FileLineCount() reports 1.
[Edit] Updated code to conform to OP functionality.
int found = 0;
while (fgets(buffer_line_data_file, 100, data_file))
{
buffer_line_data_file[strcspn(buffer_line_data_file, "\n")] = '\0';
if (strcmp(buffer_line_template_file, buffer_line_data_file) == 0)
{
found = 1;
break;
}
}
if (!found) printf("%s\n", buffer_line_template_file);
This program prints the diff of two files file1.txt and file2.txt.
#include<stdio.h>
#include <stdlib.h>
#include <memory.h>
int main() {
FILE *fp1, *fp2;
int ch1, ch2;
char fname1[40], fname2[40];
char *line = NULL;
size_t len = 0;
ssize_t read;
char *line2 = NULL;
size_t len2 = 0;
ssize_t read2;
fp1 = fopen("file1.txt", "r");
fp2 = fopen("file2.txt", "r");
if (fp1 == NULL) {
printf("Cannot open %s for reading ", fname1);
exit(1);
} else if (fp2 == NULL) {
printf("Cannot open %s for reading ", fname2);
exit(1);
} else {
while ((read = getline(&line, &len, fp1)) != -1 && (read2 = getline(&line2, &len2, fp2)) != -1) {
if (!strcmp(line, line2)) {
printf("Retrieved diff on line %zu :\n", read);
printf("%s", line);
}
}
if (ch1 == ch2)
printf("Files are identical \n");
else if (ch1 != ch2)
printf("Files are Not identical \n");
fclose(fp1);
fclose(fp2);
}
return (0);
}
You already have a very good answer (and always will from chux), but here is a slightly different approach to the problem. It uses automatic storage to reading file2 into an array of strings and then compares each line in file1 against every line in file2 to determine whether it is unique. You can easily convert the code to dynamically allocate memory, but for sake of complexity that was omitted:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
enum { MAXC = 256, MAXL = 512 };
void file1infile2 (FILE *fp2, FILE *fp1, size_t *n2, size_t *n1);
int main (int argc, char **argv) {
FILE *fp1 = fopen (argc > 1 ? argv[1] : "file1.txt", "r");
FILE *fp2 = fopen (argc > 2 ? argv[2] : "file2.txt", "r");
size_t n1 = 0, n2 = 0;
if (!fp1 || !fp2) {
fprintf (stderr, "error: file open failed.\n");
return 1;
}
printf ("\nunique words in file1, not in file 2.\n\n");
file1infile2 (fp2, fp1, &n2, &n1);
printf ("\nanalyzed %zu lines in file1 against %zu lines in file2.\n\n",
n1, n2);
return 0;
}
void file1infile2 (FILE *fp2, FILE *fp1, size_t *n2, size_t *n1)
{
char buf[MAXC] = "";
char f2buf[MAXL][MAXC] = { "" };
size_t i;
*n1 = *n2 = 0;
while (*n2 < MAXL && fgets (buf, MAXC, fp2)) {
char *np = 0;
if (!(np = strchr (buf, '\n'))) {
fprintf (stderr, "error: line exceeds MAXC chars.\n");
exit (EXIT_FAILURE);
}
*np = 0;
strcpy (f2buf[(*n2)++], buf);
}
while (*n1 < MAXL && fgets (buf, MAXC, fp1)) {
char *np = 0;
if (!(np = strchr (buf, '\n'))) {
fprintf (stderr, "error: line exceeds MAXC chars.\n");
exit (EXIT_FAILURE);
}
*np = 0, (*n1)++;
for (i = 0; i < *n2; i++)
if (!(strcmp (f2buf[i], buf)))
goto matched;
printf (" %s\n", buf);
matched:;
}
}
Look over the code and let me know if you have any questions.
Example Use/Output
$ ./bin/f1inf2 dat/f1 dat/f2
unique words in file1, not in file 2.
john
the new
guy
analyzed 4 lines in file1 against 6 lines in file2.
1) I'm trying to open a file, read the mix data (ints, chars and strings) and store them into args.
1.1) so in the sample.txt is a total of 13 (excluding args[0])
2) Need to read a file from terminal "./myprog.c < sample.txt"
Heres my code and have no idea where i went wrong:
sample.txt:
123 213 110 90 1
hello my friend
boo bleh
a b c
myprog.c:
#include <stdio.h>
int main()
{
int i = 1;
FILE *fstin=fopen(argv[0], "r"); //open the file
if (fstin == NULL) {
puts("Couldn't fopen...");
return -1;
}
//Getting all the inputs from file
while ((fscanf(fstin, "%d", argv[i])) != EOF){
i++;
}
fclose(fstin);
for (i=0; i<10; i++) {
printf("%d\n",argv[i]);
}
return 0;
}
Any help is greatly appreciated!
PS: Would like if anyone could post their complete solution? Will upload unto this post and let everyone have a review of this problem
PPS: Please excuse the poor level of coding as I am a beginner and completely new to C.
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main(int ac, char *av[]){
int i, argc=0;
char **argv=NULL, data[16];
FILE *fstin = stdin;
if(ac == 2){
if(NULL==(fstin = fopen(av[1], "r"))){
puts("Couldn't fopen...");
return -1;
}
}
while (1==fscanf(fstin, "%15s", data)){
argv = realloc(argv, (argc+1)*sizeof(char*));
argv[argc] = malloc(strlen(data)+1);
strcpy(argv[argc++], data);
}
if(ac == 2)
fclose(fstin);
for (i=0; i<argc; ++i) {
printf("%s\n", argv[i]);
}
//deallocate
return 0;
}
You are making mistake at 2nd point where you divert your file to other file which is wrong. Actually you need to first compile and need to make executable.
gcc -o my_prog ./myprog.c -Wall
You need to execute this program as below to read file from c program:
./my_prog ./sample.txt
As you are new to C programming first go to man pages related to file operations.
Solution:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main(int argc, char *argv[]) {
//If command line argument is not inserted then stop operation
if (2 != argc) {
printf("Invalid number of arguments : %d\n", argc);
return -1;
}
int size = 0, ret = 0;
char *data = NULL;
FILE *fp = NULL;
//Open file in read mode given from command line argument
if (NULL != (fp = fopen(argv[1], "r")))
{
//Find size of file
fseek(fp, 0L, SEEK_END);
size = ftell(fp);
fseek(fp, 0L, SEEK_SET);
//if file is empty no need to read it.
if (size > 0)
{
//Data pointer which contains file information
data = (char *) calloc(sizeof(char), size);
if (NULL != data)
{
//Read whole file in one statement
fread(data, sizeof(char), size, fp);
printf("File %s is readed successfully\n", argv[1]);
printf("Data:\n");
printf("%s\n", data);
free(data); data = NULL;
}
else
{
perror("memory allocation failed\n");
ret = -1;
}
}
else
{
printf("File %s is empty\n", argv[1]);
}
fclose(fp); fp = NULL;
}
else
{
perror("File open failed\n");
ret = -1;
}
return ret;
}
Now Test it on your setup and if any query please post comments.
I have one text file. I have to read one string from the text file. I am using c code. can any body help ?
Use fgets to read string from files in C.
Something like:
#include <stdio.h>
#define BUZZ_SIZE 1024
int main(int argc, char **argv)
{
char buff[BUZZ_SIZE];
FILE *f = fopen("f.txt", "r");
fgets(buff, BUZZ_SIZE, f);
printf("String read: %s\n", buff);
fclose(f);
return 0;
}
Security checks avoided for simplicity.
This should work, it will read a whole line (it's not quite clear what you mean by "string"):
#include <stdio.h>
#include <stdlib.h>
int read_line(FILE *in, char *buffer, size_t max)
{
return fgets(buffer, max, in) == buffer;
}
int main(void)
{
FILE *in;
if((in = fopen("foo.txt", "rt")) != NULL)
{
char line[256];
if(read_line(in, line, sizeof line))
printf("read '%s' OK", line);
else
printf("read error\n");
fclose(in);
}
return EXIT_SUCCESS;
}
The return value is 1 if all went well, 0 on error.
Since this uses a plain fgets(), it will retain the '\n' line feed at the end of the line (if present).
void read_file(char string[60])
{
FILE *fp;
char filename[20];
printf("File to open: \n", &filename );
gets(filename);
fp = fopen(filename, "r"); /* open file for input */
if (fp) /* If no error occurred while opening file */
{ /* input the data from the file. */
fgets(string, 60, fp); /* read the name from the file */
string[strlen(string)] = '\0';
printf("The name read from the file is %s.\n", string );
}
else /* If error occurred, display message. */
{
printf("An error occurred while opening the file.\n");
}
fclose(fp); /* close the input file */
}
This is a Simple way to get the string from file.
#include<stdio.h>
#include<stdlib.h>
#define SIZE 2048
int main(){
char read_el[SIZE];
FILE *fp=fopen("Sample.txt", "r");
if(fp == NULL){
printf("File Opening Error!!");
}
while (fgets(read_el, SIZE, fp) != NULL)
printf(" %s ", read_el);
fclose(fp);
return 0;
}