题解 | #[NOIP2008]ISBN号码#

大家凑合看看吧

#include <stdio.h>
char sum(int word,int pub,int num);
int main()
{
    int word,pub,num;
    char code;
    scanf("%d-%d-%d-%c",&word,&pub,&num,&code);
    if(sum(word,pub,num)==code)
        printf("Right");
    else
        printf("%d-%d-%d-%c",word,pub,num,sum(word,pub,num));
    return 0;
}
char sum(int word,int pub,int num)
{
    int result= (word+pub/100*2+pub/10%10*3+pub%10*4+num/10000*5+
        num/1000%10*6+num/100%10*7+num/10%10*8+num%10*9)%11;
    if(result>=0&&result<=9)
        return result+'0';
    else
        return 'X';
    
}