Submission

Score: 100

User: I_am_me

Problemset: ตรวจบัตรเครดิต

Language: c

Time: 0.002 second

Submitted On: 2025-10-12 11:59:33

#include <stdio.h>

int main() {
    char credit[17] ;
    scanf("%s",credit) ;
    int sum = 0;
    for(int i = 1;i<=15;i+=2) {
        sum+=credit[i]-48 ;
    }
    for(int i = 0;i<=14;i+=2) {
        int i2 = 2*(credit[i]-48) ;
        sum+=i2%10 + (i2-i2%10)/10 ;
    }
    if (sum%10 == 0) printf("yes") ;
    else printf("no") ;
    return 0;
}