C语言程序：统计字符串中的数字字符

#include <stdio.h>

int main() {
    char string[80];
    int count = 0;

    printf("Enter a string:");
    fgets(string, 80, stdin);

    for (int i = 0; string[i] != '\0'; i++) {
        if (string[i] >= '0' && string[i] <= '9') {
            count++;
        }
    }

    printf("count=%d", count);

    return 0;
}