Question

How to check if a string contain only one digit in C

Answer 1

#include <stdio.h>
#include <ctype.h>

int contain_multiple_digit(char* s) {
    int count = 0;;

    while (*s) {
        if (isdigit(*s)) {
            count++;
        }
        s++;
    }

    return count == 1;
}

int main(void)
{
    char str[] = "C 7 is a general purpose computer programming language";

    if (contain_multiple_digit(str)) {
        puts("yes");
    }
    else {
        puts("no");
    }

    return 0;
}




/*
run:

yes

*/

 

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