How to use sscanf in loops?

Question

Is there a good way to loop over a string with sscanf?

Let\'s say I have a string that looks like this:

char line[] = \"100 185 400 11 1         


        

Answer 1

Look up the %n conversion specifier for sscanf() and family. It gives you the information you need.

#include <stdio.h>

int main(void)
{
    char line[] = "100 185 400 11 1000";
    char *data = line;
    int offset;
    int n;
    int sum = 0;

    while (sscanf(data, " %d%n", &n, &offset) == 1)
    {
        sum += n;
        data += offset;
        printf("read: %5d; sum = %5d; offset = %5d\n", n, sum, offset);
    }

    printf("sum = %d\n", sum);
    return 0;
}

Changed 'line' to 'data' because you can't increment the name of an array.