Question

How to check if there is only one time zero in a string with C

Answer 1

#include <stdio.h>
#include <stdbool.h>

bool OnlyOneZero(const char* str) {
    int count = 0;
    for (int i = 0; str[i] != 0; i++) {
        if (str[i] == '0') {
            count++;
        }
    }
    return count == 1;
}

int main(void) {

    char s1[] = "294098";
    puts(OnlyOneZero(s1) ? "yes" : "no");

    char s2[] = "47034099";
    puts(OnlyOneZero(s2) ? "yes" : "no");

    return 0;
}




/*
run:

yes
no

*/

 

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