Submission

Score: 100

User: theem1502

Problemset: เลขหลักของผลคูณ

Language: c

Time: 0.001 second

Submitted On: 2025-09-12 14:32:39

#include <stdio.h>

int main() {
    int digit;
    long long a, b;
    scanf("%lld %lld %d", &a, &b, &digit);
    long long prod = a * b;
    long long tempprod = prod;
    int digitcount = 0;
    if (tempprod == 0) {
        digitcount = 1;
    }
    
    while (tempprod > 0) {
        tempprod /=10;
        digitcount++;
    }
    if (digit == 0) {
        printf("%c", '_');
        return 0;
    }
    if (digit > digitcount) {
        printf("%c", '_');
        return 0;
    }

    for (int i = 0; i < digitcount - digit; i++) {
        prod /= 10;
    }

    printf("%d", prod % 10);



}