I'm looking to read in a number from the keyboard and then I have to manipulate each digit individually (it's an Octal to Decimal converter).
Is there something similar to the charAt() method from Java that can be used to work with s particular digit?
I currently have the below code (incomplete) but when compiling, it returns "error: subscripted value is neither array nor pointer"
#include <stdio.h>
#include <math.h>
#include <string.h>
int main()
{
printf("Please enter an octal number ending with #");
char nextNum = getchar();
char number;
int counterUp = 0; //Records how many digits are entered
int counterDown = 1; //Records progress during conversion
int decimalNumber = 0;
while(nextNum != '#') //reads in the whole number, putting the characters together to form one Octal number.
{
number = (number + nextNum);
counterUp++;
nextNum = getchar();
}
//Begin converson from Octal to Decimal
while(counterUp >= 0)
{
int added = (number[counterUp] * (pow(8, counterDown)));
decimalNumber = (decimalNumber + added);
counterDown++;
}
}
I'm not looking to be told how to go from octal to decimal, just how to work with one digit at a time.
Use fgets() instead of a single char:
char number[25]; // max of 25 characters in string
fgets(number, 24, stdin); // read a line from 'stdin', with a max of 24 characters
number[24] = '\0'; // append the NUL character, so that we don't run into problems if we decide to print the string
Now you can subscript number at will, e.g. number[10] = 'A'.
I think you're used to Java way where you can write something like:
String number = "";
number += "3";
number += "4";
Strings in C do not work like that. This code doesn't do what you think it does:
char number = 0; // 'number' is just a one-byte number
number += '3'; // number now equals 51 (ASCII 3)
number += '4'; // number now equals 103 (meaningless)
Maybe something like this will work for you:
char number[20];
int i = 0;
number[i++] = '3';
number[i++] = '4';
Or, you could simply use scanf to read a number in from the keyboard.
I recommend that you find a good book about C and read about strings first, then scanf second.
I think you need to step back and look at your algorithm more closely.
What does char number store? What do you expect this loop to do:
while(nextNum != '#') //reads in the whole number, putting the characters together to form one Octal number.
{
number = (number + nextNum);
counterUp++;
nextNum = getchar();
}
In particular, what does number = (number + nextNum); mean?
You need to define number as an array of chars.
e.g.
char number[16];
Then change your reading loop to append to the array.
while(nextNum != '#')
{
number[counterUp] = nextNum;
counterUp++;
nextNum = getchar();
}
Related
I'm writing a code in C to find the digits that repeat in a given number, and the one that I wrote works fine for small numbers, but the output gets messed up if I input a large value, N < 1000.
Here is my code; please help me out!
For the input:
1839138012980192380192381090981839
I get this output:
0 2 3 5 7 8
#include <stdio.h>
int main()
{
int digit, digits[10], flag = 0, i;
long long num;
scanf("%lld", &num);
while (num)
{
digit = num % 10;
if (digits[digit])
flag = 1;
digits[digit]++;
num /= 10;
}
if (flag)
{
for (i = 0; i < 10; i++)
{
if (digits[i] > 1)
printf("%d ", i);
}
printf("\n");
}
else
printf("The are no repeated digits.\n");
return 0;
}
The long long type can only represent a limited range of numbers. In your C implementation, 1839138012980192380192381090981839 is too big for long long, and scanf("%lld", &num) does not work.
Instead, read each character of input using c = getchar();, where c is declared as an int. If, after getchar, c is EOF, stop looping and print the results. If c is not EOF, then check whether it is a digit using if (isdigit((unsigned char) c)). The isdigit function is defined in <ctype.h>, so include that header.
If the character is a digit, then convert it from a character to the number it represents using c - '0'. You can use int d = c - '0'; to store the number in d. Then increment the count for the digit d.
If the character is not a digit, you can decide what to do:
There will likely be a new-line character, '\n', at the end of the line the user entered. You may want to ignore it. When you see the new-line, you could end the loop and print the results, you could continue reading to see if there are any other digits or characters before EOF is seen and report a problem to the user if there are, or you could ignore it and continue looping.
There could be spaces in the input. You might want to ignore them, or you might want to report a problem to the user.
If there are other characters, you might want to report a problem to the user.
Here's another approach, which you could use with a string of some maximum length (defined by the constant MAX_LEN).
A string made up of a bunch of char will use one byte per character, so you can define MAX_LEN up to how many bytes you have in system memory, generally, although in practice you probably would use a much smaller and more reasonable number.
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define MAX_LEN 12345
int main()
{
int digit, digits_checker[10] = {0}, flag = 0, i;
char* num;
/* set aside space for the string and its terminator */
num = malloc(MAX_LEN + 1);
/* read num from input */
scanf("%s", num);
/* get the string length */
size_t num_length = strlen(num);
/* walk over every character in num */
for (size_t position = 0; position < num_length; position++)
{
/*
We assume that the value of num[position] is an
ASCII character, from '0' to '9'. (If you can't make
that assumption, check the input and quit with an
error, if a non-digit character is found.)
If the input is valid, the digits 0-9 in the ASCII
table start at 48 ('0') and end at 57 ('9'). Subtracting
48, therefore, gives you the integer value at each digit
in num.
*/
digit = num[position] - 48;
/*
Increment a counter for each digit
*/
digits_checker[digit]++;
}
/* num is no longer needed, so we free its memory */
free(num);
/* check each digit */
for (i = 0; i < 10; i++)
{
if (digits_checker[i] > 1) {
printf("%d ", i);
flag = 1;
}
}
if (!flag) {
printf("The are no repeated digits.\n");
}
else {
printf("\n");
}
return 0;
}
The suggestion to check input is a good one. You can't necessarily assume that what someone enters will be entirely made up of digit characters.
But hopefully this demonstrates how to set aside space for a string, and how to read through it, one character at a time.
I got this exercise that I haven't been able to solve, the point is to create a program where you type in a text, then the program analyzes each word of the text and counts the vowels of each word, then the program returns in screen the number of words that have 3 or more different vowels, and by different I mean, it doesn't matter if the word has 3 "a", it only count as one (the word has the vowels "a", it doesn't matter how many times), so for example, the word "above" has 3 vowels, the word "been" has 1 vowels, the word "example" has 2 vowels. The vowels can be upper case or lower case, it doesn't matter, and here is the tricky part: It cannot contain any pointers or functions made by us.
what i did was asking the user to enter word by word so the program analyze each word, and then at the end returns the number of words that contain 3 or more vowels, but I feel like there must be an easier way where the user can type a complete paragraph or text, then the program analyzes each word and return the number of words that have 3 or more different vowels.
Anyway, my code is as follows, any suggestions would be appreciated:
#include <stdio.h>
#include <stdlib.h>
#include <conio.h>
main() {
int vowels, text, words, c, total=0,a=0,e=0,i=0,o=0,u=0;
printf ("How many words does your text has? ");
scanf("%d",&words);
for(c=1;c<=words;c++){
printf("Type your word %d, after that press enter, then press 'control' and 'z' at the same time, and then press enter again: \n", c);
while (EOF != (text=getchar())){
if (text == 'a' || text == 'A'){
a++;
if (a >=2){
a = 1;
}
}
if (text == 'e' || text == 'E'){
e++;
if (e >=2){
e = 1;
}
}
if (text == 'i' || text == 'I'){
i++;
if (i >=2){
i = 1;
}
}
if (text == 'o' || text == 'O'){
o++;
if (o >=2){
o = 1;
}
}
if (text == 'u' || text == 'U'){
u++;
if (u >=2){
u = 1;
}
}
}
vowels = a+e+i+o+u;
if(vowels >=3){
total = total +1;
}
a=0,e=0,i=0,o=0,u=0;
vowels = 0;
}
printf("\n\nThe total of words with 3 or more vowels is: %d", total);
printf("\n");
total=0;
return 0;
}
In order to read and analyze a single word, or a paragraph words to determine the number of words that contain at least three different vowels (of any case), this is one of the rare times when reading input with scanf (using the '%s' format specifier) actually is a reasonable choice.
Recall the '%s' format specifier will read characters up to the first whitespace. That gives you a simple way to read a word at a time from stdin. To end input, the user simply need to generate an EOF by entering ctrl+d (or ctrl+z on windows). This satisfies your paragraph requirement.
For parsing, you can take advantage of converting each character to lower case to simplify checking for vowels. Using a frequency array of 5 elements provides a simple way to track the number of different vowels found in each word. Then a final test to see if the number of vowels found equals the required number is all you need before incrementing your total word count for words with three different vowels.
A simple implementation would be something similar to:
#include <stdio.h>
enum { NREQD = 3, NVOWEL = 5, MAXC = 128 }; /* declare constants */
int main (void) {
char word[MAXC] = ""; /* word buffer */
size_t wordcnt = 0; /* words with 3 different vowels */
printf ("enter a word(s) below, [ctrl+d on blank line to end]\n");
for (;;) {
int vowels[NVOWEL] = {0}, /* frequency array */
vowelcnt = 0, /* vowels per-word */
rtn; /* scanf return */
if ((rtn = scanf ("%127s", word)) == EOF) /* chk EOF */
break;
for (int i = 0; word[i]; i++) { /* loop over each char */
if ('A' <= word[i] && word[i] <= 'Z') /* check upper */
word[i] ^= 'a' - 'A'; /* convert to lower */
switch (word[i]) { /* check if vowel */
case 'a': vowels[0] = 1; break;
case 'e': vowels[1] = 1; break;
case 'i': vowels[2] = 1; break;
case 'o': vowels[3] = 1; break;
case 'u': vowels[4] = 1; break;
}
}
for (int i = 0; i < NVOWEL; i++) /* loop over array */
if (vowels[i]) /* check index */
vowelcnt++; /* increment vowelcnt */
if (vowelcnt >= NREQD) /* do we have at least 3 vowels? */
wordcnt++; /* increment wordcnt */
}
printf ("\nThere are %zu words with %d different vowels.\n",
wordcnt, NREQD);
}
Example Use/Output
$ ./bin/vowelcnt
enter a word(s) below, [ctrl+d on blank line to end]
Everyone Understands That The Dictionary Doesn't Track
Words That Contain Vowels Like It Does Etimology.
There are 4 words with 3 different vowels.
Look things over and let me know if you have further questions.
You can use fgets to read a whole line. I don't know how you define a
paragraph though, do you mean just a long text or a collection of lines? You can
copy & paste multiple lines in the console and if you loop using fgets, then
you get all the lines. But allowing the user to enter multiple lines at once,
it's more tricky, because you should know how many lines the user will input.
That's why I'd say focus on reading the text line by line.
Your solution reads characters by characters and you are ignoring non-vowels.
That's OK, but you are not detecting words like you should do. The for loop
makes no sense, because in the first iteration you enter in a while loop that
is only going to leave when there are no more characters to read from stdin.
So the next iteration of the for loop will not enter the while loop and you
won't be reading anything any more.
You are also repeating too much code, I know you assignment says not to use your
own functions, but this can be improved with a simple look up table by creating
an array of chars using the characters as an index for the array. I'll explain
that in the code.
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <limits.h>
int main(void)
{
char line[1024];
// initializing look ups with 0
int lookup_vowels[1 << CHAR_BIT] = { 0 };
// using 'a', 'e' as index for the lookup table
// if you want to know if a character is a vowel,
// lookup_vowels[character] will be 1 if character is
// a vowel, 0 otherwise
lookup_vowels['a'] = lookup_vowels['e'] = lookup_vowels['i'] =
lookup_vowels['o'] = lookup_vowels['u'] = 1;
// for parsing word with strtok
const char *delim = " \t\r\n";
int num_of_words = 0;
printf("Enter some text, to end input press ENTER and then CTRL+D\n");
while(1)
{
if(fgets(line, sizeof line, stdin) == NULL)
break;
// parsing words
char *word = strtok(line, delim);
if(word == NULL)
continue; // the line has only delimiters, ignore it
do {
// will be access with the same principle as the lookup
// table, the character is the index
int present[1 << CHAR_BIT] = { 0 };
size_t len = strlen(word);
for(size_t i = 0; i < len; ++i)
{
// I'll explain later the meaning
int c = tolower(word[i]);
if(lookup_vowels[c])
present[c] = 1; // set the present for a vowel to 1
}
int count = present['a'] + present['e'] + present['i'] + present['o']
+ present['u'];
if(count > 2)
{
printf("'%s' has more than three distinct vowels\n", word);
num_of_words++;
}
} while((word = strtok(NULL, delim)));
}
printf("The number of word with three or more distinct vowels: %d\n", num_of_words);
return 0;
}
So let me quickly explain some of the technique I use here:
The lookup table is an array of size 256 because a char is 8-bit1
value and can have 256 different values (range [0,255]). The idea is that this
array is initialized with 0 overall (int lookup_vowels[1<<CHAR_BIT] = { 0 };) and then
I set to 1 only in 5 places: at the position of the vowels using their
ASCII value as index.
So instead of doing the repeating task if checking
// where c is a char
if(c == 'a' || c == 'A')
a=1;
}
for all vowels, I just can do
int idx = tolower(c);
if(lookup_vowels[idx])
{
// c is a vowel
}
The present variable function similar to the lookup table, here I use the
ASCII code of a vowel as index and set it to 1 if a vowel is present in word.
After scanning all characters in word, I sum all values stored in present.
If the value is greater than 2, then the word has at least 3 or more distinct
vowels and the counter variable is increased.
The function strtok is used to split the line using a defined set of
delimiters, in this case the empty character, tab, carriage return and line
feed. To start parsing the line, strtok must be called with the source string
as the first argument and the delimiters as the second argument. All other
subsequent calls must pass NULL as the first argument. The function returns a
pointer to the next word and returns NULL when no more words have been found.
When a word is found, it calculates the number of distinct vowels and checks if
this number is greater than 2.
fotenotes
1CHAR_BIT defined in limits.h returns the number of bits of byte.
Usually a byte is 8-bit wide, so I could have written 256 instead. But there are
"exotic" architectures where a byte is not 8-bit long, so by doing 1<<CHAR_BIT
I'm getting the correct dimension.
I'm currently doing the CS50 course, and I'm stuck on the credit problem. The idea is to make a program to verify cards due to their inbuilt checksum. The first step is to take every second digit and multiply it by 2, then add all the digits of the products together.
My code isn't finished, but I've set it up to print some intermediary steps just so I can see what's going on.
#include <stdio.h>
#include <string.h>
void checksum (char number[20]);
int main (void){
char *card;
printf("Please enter a card number:");
scanf("%s", card);
if (strlen(card) == 13 || strlen(card) == 16 || strlen(card) == 15) {
checksum(card);
}
else{
printf("Not a number. Please try again.\n");
main();
}
}
void checksum (char *number) {
int check = 0;
int digits = 0;
for(int i = 1; i < 17; i += 2){
printf("No%c\n", number[i]);
digits = (number[i] * 2);
printf("D%i\n", digits);
while (digits > 0) {
check += digits % 10;
printf("C%i\n", check);
digits = digits / 10;
}
}
}
I know the first part is far from perfect but it's the checksum function I'm concerned with at the moment. When it takes the second digit(5) everything is fine. But then when it's multiplied by 2 according to the next line, somehow the result is 106(?)
Can someone explain what's going on here?
terminal output
You read in a string, i.e. a sequence of characters, probably in ASCII format. So your input "1500150015001500" is actually a sequence of characters terminated by string terminating character 0x0, e.g. like { '1', '5', '0', .... '\0' }. A single character value like '1', when interpreted as an integral value, is represented by its ASCII code, which is 48 for '0', 49 for '1', ... , and 53 for '5'. Hence, an expression like char c = '5'; int digit = c*2 actually yields 106 for digit. To take character '5' as integral value 5, you could write int digit = (c - '0'), which is the same as if you wrote (53 - 48).
Without modifying your code to much, test what happens:
#include <stdio.h>
#include <string.h>
void checksum (char *number);
int main (void){
char card[30];
printf("Please enter a card number:");
scanf("%s", card);
if (strlen(card) == 13 || strlen(card) == 16 || strlen(card) == 15) {
checksum(card);
}
else{
printf("Not a number. Please try again.\n");
main();
}
}
void checksum (char *number) {
int check = 0;
int digits = 0;
for(int i = 1; i < strlen(number); i += 2){
printf("No%c\n", number[i]);
digits = ((number[i]-'0') * 2);
printf("D%i\n", digits);
while (digits > 0) {
check += digits % 10;
printf("C%i\n", check);
digits = digits / 10;
}
}
}
A couple of things:
char *card; scanf("%s", card); is not going to work. You need to either declare card as an array of fixed size (i.e. char card[20]), or use malloc to allocate memory for the pointer char *card;. If you choose the latter option you also need to use free on the memory when you're done with it.
In your function checksum, you need to convert the characters you read in the string card into numbers. If the character set on your system is ASCII, you can achieve this by subtracting the value 0x30 (i.e. the numeric value of the character '0') from each character in the string before performing arithmetic on it.
char number[20] in a function signature is pointless; see this question for more information. Since the array decays to a pointer to its first element when passed as a function argument, you may as well have char *number in the function signature.
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I have to write a program that converts an user input (which is a string) to an Integer. In the same time it should check, if the user input really is a number.
And also everything in one method.
and NO LIBRARY FUNCTIONS allowed.
I can't figure any idea how to do it. All I got for the beginning is just this pathetic structure
#include <stdio.h>
void main()
{
char input[100];
int i;
int sum = 0;
printf("Type a String which will be converted to an Integer: ");
scanf("%c, &input");
for (i = 0; i < 100; i++)
{
}
}
I appreciate any help, thanks
The conversion is the easy part...
But if you must not use library functions,
there is only one way to take a string, and that is argv;
there is only one way to give an integer, and that is the exit code of the program.
So, without much ado:
int main( int argc, char * argv[] )
{
int rc = 0;
if ( argc == 2 ) // one, and only one parameter given
{
unsigned i = 0;
// C guarantees that '0'-'9' have consecutive values
while ( argv[1][i] >= '0' && argv[1][i] <= '9' )
{
rc *= 10;
rc += argv[1][i] - '0';
++i;
}
}
return rc;
}
I did not implement checking for '+' or '-', and did not come up with a way to signal "input is not a number". I also just stop parsing at the first non-digit. All this could probably be improved upon, but this should give you an idea of how to work around the "no library functions" restriction.
(Since this sounds like a homework, you should have to write some code of your own. I already gave you three big spoons of helping regarding argv, the '0'-'9', and the conversion itself.)
Call as:
<program name> <value>
(E.g. ./myprogram 28)
Check return code with (for Linux shell):
echo $?
On Windows it's something about echo %ERRORLEVEL% or somesuch... perhaps a helpful Windows user will drop a comment about this.
Source for the "'0'-'9' consecutive" claim: ISO/IEC 9899:1999 5.2.1 Character sets, paragraph 3:
In both the source and execution basic character sets, the value of each character after 0 in the above list of decimal digits shall be one greater than the value of the previous.
I'm sure this is preserved in C11, but I only have the older C99 paper available.
Take hightes digit and add it to number, multiply the number by 10 and add the next digit. And so on:
#include <stdio.h> // scanf, printf
void main()
{
char input[100];
printf("Type a String which will be converted to an Integer: ");
scanf("%s", input);
int number = 0;
int neg = input[0] == '-';
int i = neg ? 1 : 0;
while ( input[i] >= '0' && input[i] <= '9' )
{
number *= 10; // multiply number by 10
number += input[i] - '0'; // convet ASCII '0'..'9' to digit 0..9 and add it to number
i ++; // step one digit forward
}
if ( neg )
number *= -1;
printf( "string %s -> number %d", input, number );
}
input[i] - '0' works, because ASCII characters '0'..'9' have ascending ASCII codes from 48 to 57.
So basically you want to know how something like the standard library atoi works. In order to do this, you need to consider how strings represent numbers.
Basically, a string (that represents a number) is a list o digits from 0 to 9. The string abcd (where a, b, c, d are placeholders for any digit) represents the number a*10 ^ 3 + b*10^2 + c * 10 + d (considering base 10 here, similar for other bases). So basically you need to decompose the string as shown above and perform the required arhitmetic operations:
// s - the string to convert
int result = 0;
for (int index = 0; index < strlen(s); index++) {
result = result * 10 + s[index] - '0';
}
The operation s[index] - '0' converts the character that represent a digit to its value.
// the function returns true for success , and false for failure
// the result is stored in result parameter
// nb: overflow not handled
int charToInt(char *buff,int *result){
*result=0;
char c;
while(c=*buff++){
if((c < '0') || (c >'9')) // accept only digits;
return 0;
*result *= 10;
*result += c-'0';
}
return 1;
}
Lot of things which are missed. Firstly taking a string in is done by scanf("%s",input); By the way in which you are receiving it, it only stores a character, secondly run the loop till the length of the string recieved. Check the below code.
#include <stdio.h>
#include<string.h>
void main()
{
char input[100];
int i;
int sum = 0;
printf("Type a String which will be converted to an Integer: ");
scanf("%s", input);
for (i = 0; i < strlen(input); i++)
{
if(input[i]>=48 && input[i]<=57)
{
//do something, it is a digit
printf("%d",input[i]-48);
//48 is ascii value of 0
}
}
Try it:
#include <stdio.h>
void main()
{
char input[100];
int i,j;
int val = 0;
printf("Type a String which will be converted to an Integer: ");
scanf("%s",input);
for(j=0; input[j] != '\0'; j++); // find string size
for (i = 0; i < j; i++)
{
val = val * 10 + input[i] - 48;
}
}
If you want your code to be portable to systems that don't use ASCII, you'll have to loop over your char array and compare each individual character in the source against each possible number character, like so:
int digit;
switch(arr[i]) {
case '0':
digit=0; break;
case '1':
digit=1; break;
// etc
default:
// error handling
}
Then, add the digit to your result variable (after multiplying it by 10).
If you can assume ASCII, you can replace the whole switch statement by this:
if(isdigit(arr[i])) {
digit=arr[i] - '0';
} else {
// error handling
}
This works because in the ASCII table, all digits are found in a single range, in ascending order. By subtracting the ordinal value of the zero character, you get the value of that digit. By adding the isdigit() macro, you additionally ensure that only digit characters are converted in this manner.
I want to write a C program which will take an IP address from the user like "112.234.456.789" in a string and give formatted output in addition of each block in string, e.g., "04.09.15.24" for the above IP address. Here's what I have so far:
#include<stdio.h>
#include<string.h>
#include<conio.h>
main()
{
char s[15],d[11];
int i=0,c = 0, sum[4] = {0};
d[i]=sum[c]/10;
printf("Enter ip address:");
gets(s);
printf("\n \n %s",s);
i=0;
for(c=0;c<15;c++)
{
if(s[c]!='.'||s[c]!='\0')
sum[i]=(s[c]-48)+sum[i];
else
i++;
}
for(i=0,c=0;c<4;c++,i+=3)
{
d[i]=(sum[c]/10)+48;
d[i+1]=sum[c]%10+48;
d[i+2]='.';
}
printf("\n \n %s",d);
getch();
}
The input should be an IP address like "112.234.546.234", and the output should be the result of adding the digits in each block, "04.09.15.06". The input and output should be in strings.
The problem with your code is that s[c]!='.'||s[c]!='\0' is going to evaluate true for any character in the input -- even '.'. This means i is never incremented, and ot only is every digit is summed to sum[0], but so is '.' - 48.
What you meant was s[c] != '.' && s[c] != '\0'.
I wrote the function you desire here.
#include <stdio.h>
#include <ctype.h>
void convert(const char *in, char *out) {
unsigned int sum = 0;
char ch;
do {
ch = *in++;
if (isdigit(ch)) {
sum += ch - '0';
} else {
*out++ = sum / 10 + '0';
*out++ = sum % 10 + '0';
if (ch == '.') {
*out++ = '.';
sum = 0;
}
}
} while (ch);
}
By the way, each "block" of the IPv4 address is an octet, and what you are doing is replacing each with its digit sum.
I just code you a simple example of how to "discard" unwanted characters.
#include <studio.h>
main ()
{
int add1, add2, add3, add4;
printf("enter an ip in the form xxx.xxx.xxx.xxx: )";
scanf("%d%*c%d%*c%d%*c%d", &add1, &add2, &add3, &add4);
printf("add1 = %d add2 = %d add3 = %d add4 = %d\n\n", add1, add2, add3, add4);
return 0;
}
console output:
enter a ip in the form xxx.xxx.xxx.xxx: 123.321.456.654
add1 = 123 add2 = 321 add3 = 456 add4 = 654
EDIT: you just have to play along with the "add#" variables to do your math thing.
It looks like homework (if this is the case, please tag it as homework), so I am going to give a few pointers:
Use fgets to read the input from the user. Read the input into a string.
Use sscanf to parse the string. Since you know there will be four positive integers, use "%u.%u.%u.%u" as the format string.
For each one of the four integers, compute the sum of the digits (using division by 10 and remainder by 10, as you just did).
Print the formatted output using printf (or snprintf to print to a string). If you want each sum to be formatted as a two-digits integer, with leading 0, use "%02u" as format specifier.
P.S. Be careful with snprintf, it might bite.
Other tips
Focus on one step at a time. Divide and conquer. Write a digit_sum function, taking an integer as argument, which computes the sum of its digits:
unsigned int digit_sum(unsigned int n)
{
unsigned int sum = 0;
while (n > 0) {
sum += n % 10;
n /= 10;
}
return sum;
}
Once your digit_sum function is working well, proceed with the main task.