c++编写简单的计算器程序

//四则运算#include "stdafx.h"#include<iostream>#include<stdio.h>using namespace std;void add(){  printf("输入要计算的加数（例如a b）/n");  int adda=0, addb=0,addc=0;  cin >> adda;  cin >> addb;  addc = adda+addb;  cout <<adda<<"加"<<addb<< "等于" << addc << endl;   }void substraction(){  printf("输入要计算的减数（例如a b）/n");  int suba = 0, subb = 0, subc = 0;  cin >> suba;  cin >> subb;  subc = suba-subb;  cout <<suba<<"减"<<subb<< "等于" << subc << endl;}void multiplication(){  printf("输入要计算的乘数（例如a b）/n");  int mula = 0, mulb = 0, mulc = 0;  cin >> mula;  cin >> mulb;  mulc = mula*mulb;  cout <<mula<<"乘"<<mulb<< "等于" << mulc << endl;}void division(){  printf("输入要计算的除数（例如a b）/n");  int dsa = 0, dsb = 0, dsc = 0,dsd=0;  cin >> dsa;  cin >> dsb;  dsc = dsa/dsb;  dsd = dsa%dsb;  cout <<dsa<<"除"<<dsb<< "等于" << dsc <<"余"<<dsd<<endl;}void operation()//运算函数{  printf("输入数据选择做那种运算/n");  printf("输入0选择退出，1做加法，2做减法，3做乘法，4做除法（保留余数）/n");     int operatione = 0;  cin >> operatione;  cout << endl;  try  {    if (operatione == 1)    {      //加法      add();    }    else if (operatione == 2)    {      //减法      substraction();    }    else if (operatione == 3)    {      //乘法      multiplication();    }    else if (operatione == 4)    {      //出发      division();    }    else if (operatione == 0)    {      exit(0);    }    else    {      throw 1;    }  }  catch (int i)  {    cout << "输入错误" << endl;  }  operation();} int main(){  printf("欢迎使用本计算器");  operation();  return 0;}