例2.cpp

c语言书籍&课件&示例代码

#include<stdio.h>
#include<stdlib.h>
struct Arith{
	int x,y,z;
	char op;
};
void main()
{	struct Arith n,*p=&n;
	printf("enter XopY:");
	scanf("%d%c%d",&n.x,&p->op,&n.y);
	switch(p->op){
	  case'+':p->z=p->x+p->y;break;
	  case'-':p->z=p->x-p->y;break;
      case'*':p->z=p->x*p->y;break;
	  case'/':if(p->y) {p->z=p->x/p->y;break;}
              else {printf("除数为0，退出运行！\n"); exit(1);
		           }
	  default:printf("运算符非法，退出运行！\n"); exit(1);
	}
	printf("%d%c%d=%d\n",(*p).x,(*p).op,(*p).y,(*p).z);
}