#include<stdio.h>   /*輸入兩數求和一次*/
void main()
{
	printf("\n"); 
	long a,b,sum;
	printf("請輸入兩數,以空格間隔,相加一次結束:\n");
	scanf("%d%d",&a,&b);
	sum=a+b;
	printf("sum is %d\n",sum);
	printf("\n"); 

}