Submission

Score: 100

User: kenkong587

Problemset: เลขหลักของผลคูณ

Language: c

Time: 0.004 second

Submitted On: 2026-10-04 15:39:11

#include <stdio.h>
#include <math.h>

int main(){

    int A,B,x;

    scanf("%d %d",&A,&B);

    int sum = A*B;
    int csum = sum;
    int k = 0;

    while(csum != 0){
        csum /= 10;
        k++;
    }

    if(sum == 0){
        k = 1;
    }

    int num[k];

    for(int i = k-1;i > -1;i--){
        num[i] = (int)(sum / pow(10,i)) % 10;
    }

    scanf("%d",&x);

    if(x > k){
        printf("_");
    }
    else{
        printf("%d",num[k-x]);
    }

    return 0;
}