C语言_指针_题写一个计算器

//写一个计算器void menu()
{printf("******************************\n");printf("********1.add   2.sub*********\n");printf("********3.mul   4.div*********\n");printf("********0.exit       *********\n");printf("******************************\n");}int Add(int x,int y)
{return x + y;
}int Sub(int x, int y)
{return x - y;
}
int Mul(int x, int y)
{return x * y;
}
int Div(int x, int y)
{return x/y;
}void calc(int (*pf)(int,int))
{int ret = 0;int x = 0;int y = 0;printf("请输入两个整数:>\n");scanf("%d%d", &x, &y);ret = pf(x, y);printf("输出结果:%d\n", ret);
}int main()
{int input = 0;do {menu();scanf("%d",&input);switch (input){case 1:calc(Add);break;case 2:calc(Sub);break;case 3:calc(Mul);break;case 4:calc(Div);break;case 0:break;default:printf("输入错误\n");}} while (input);return 0;
}