计算器

#define _CRT_SECURE_NO_WARNINGS 1 
#include<stdio.h>

int Div(int x, int y)
{
  return x / y;
}
int Mul(int x, int y)
{
  return x * y;
}
int Sub(int x, int y)
{
  return x - y;
}
int Add(int x, int y)
{
  return x + y;
}
void menu()
{
  printf(" * * * * * * * * * * * *\n");
  printf(" * *      0:exit     * *\n");
  printf(" * * 1:Add     2:Sub * *\n");
  printf(" * * 3:Mul     4:Div * *\n");
  printf(" * * * * * * * * * * * *\n");
}
void Calc(int (*pf)(int ,int))
{
  int x, y;
  printf("请输入2个操作数:>");
  scanf("%d%d", &x, &y);
  printf("%d\n", pf(x, y));
}
int main()
{
  int op=0;
  do
  {
    menu();
    printf("请输入你要做的运算:>");  
    scanf_s("%d", &op);
    switch (op)
    {
    case 1:
      Calc(Add);
        break;
    case 2:
      Calc(Sub);
      break;
    case 3:
      Calc(Mul);
      break;
    case 4:
      Calc(Div);
      break;
    case 0: 
      printf("退出计算器\n");
      break;
    default: 
      printf("选择错误,请重新选择:>\n");
      break;
    }
  } while (op);

  return 0;
}