main(){int a,b,c;scanf("%d%d",&a,&b);c=a+b;printf("he deng yu :%d",c);c=a-b;printf("cha deng yu:%d",c);c=a*b;printf("ji deng yu:%d",c);getch();}}
scanf("%d%d%",&a,&b);在这里错了,多了个%,应该是scanf("%d%d",&a,&b);
scanf("%d%d%",&a,&b); 多了一个%号