PAT 1001

#include<iostream>#include<cstdio>using namespace std;int main(){int a,b;int sum;scanf("%d%d",&a,&b);sum=a+b;if(sum<0)//转化{printf("-");sum=-sum;}if(sum<1000)printf("%d",sum);else if(sum>=1000&&sum<1000000)printf("%d,%03d",sum/1000,sum%1000);//03占位符else if(sum>=1000000)printf("%d,%03d,%03d",sum/1000000,sum%1000000/1000,sum%1000);return 0;}