#include<stdio.h>
int main(){ int a,b; while(scanf("%d%d",&a,&b),a||b) { printf("%d\n",a+b); } return 0;}//错误代码,多了一个scanf语句 #include<stdio.h>int main(){ int a,b; while(scanf("%d%d",&a,&b),a||b) { scanf("%d%d",&a,&b); printf("%d\n",a+b); } return 0;}