题解 | #Primary Arithmetic#

#include <stdio.h>
#include <string.h>

//非常简单的代码，应该一目了然，就不解释了
int main() {
    int a,b;
    while (scanf("%d %d", &a, &b) != EOF) {
        if (a==0&&b==0){
            break;
        }
        int count=0;
        int jinwei=0; //这是低位的进位
        while (a!=0 || b!=0) {  //算到两数都变为0，就算两数长短不一也不影响，大不了短的那个后面一直是0
            int n1=a%10;
            int n2=b%10;
            if (n1+n2+jinwei>=10){
                count++;
                jinwei=1;
            }else {
                jinwei=0;
            }
            a/=10;
            b/=10;
        }
        if (count==0){
            printf("NO carry operation.\n");
        }else if (count==1){
            printf("1 carry operation.\n");
        }else {
            printf("%d carry operations.\n", count);
        }
    }
    return 0;
}