PAT甲级1001水题飘过

 1 #include<iostream>
 2 using namespace std;
 3 
 4 int main(){
 5     int a, b;
 6     while(scanf("%d%d", &a, &b) != EOF){
 7         int c = a + b;
 8         if(c == 0) printf("0\n");
 9         else{
10             if(c < 0){
11                 printf("-");
12                 c = -c;
13             }
14             int k[5];
15             int cnt = 0;
16             while(c != 0){
17                 int x = c % 1000;
18                 c /= 1000;
19                 k[cnt++] = x;
20             }
21             for(int i = cnt-1; i >= 0; i--){
22                 if(i != cnt-1){
23                     printf("%03d", k[i]);
24                 }else{
25                     printf("%d", k[i]);
26                 }
27                 if(i != 0) printf(",");
28             }
29             printf("\n");
30         }
31     }
32     return 0;
33 }