In C, how do i insert an integer into a string?

Question

My code gets a string of characters. For example \"aaabbffffdd\" A function inserts to a new string the letters and the amount of times they appear. So the output for this specifi

Answer 1

Try this code, it uses snprintf to convert integer to string.

NOTE: You may need to increase the size from 2, if count exceeds a character size.

#include 
#include 
#include 
#define LONG 80
#define SHORT 20
void longtext(char longtxt[LONG], char shorttxt[SHORT])
{
    int i, j=0, count=0, tmp;
    char letter;
    for (i = 0; i <= strlen(longtxt); ++i)
    {
        if (i == 0)
        {
            letter = longtxt[i];
            ++count;
        }
        else if (letter == longtxt[i])
            ++count;
        else
        {
            shorttxt[j] = letter;
            snprintf(&shorttxt[j + 1],2,"%d",count);
            j += 2;
            count = 1;
            letter = longtxt[i];
        }
    }
}
int main()
{
    char longtxt[LONG] = "aaabbffffdd",shorttxt[SHORT];
    longtext(longtxt,shorttxt);
    printf("%s", shorttxt);
}