Simplest calculator code which performs operations on two operands

#include "stdafx.h"

#include "conio.h"

#include "iostream"

#include "stdio.h"

using namespace std;

void AddNumber();

void AddIntegerNumer();

void AddRealNumber();

void AddCharNumber();

void SubtractNumber();

void MultiplyNumber();

void DivideNumber();

void ModulusNumber();

int _tmain(int argc, _TCHAR* argv[])

{

       char choice;

       char option;

       do

       {

              cout<<"press + to add two numbers"<<endl;

              cout<<"press - to subtract two numbers"<<endl;

              cout<<"press * to multiply two numbers"<<endl;

              cout<<"press / to divide two numbers"<<endl;

              cout<<"press % to take modulus of two numbers"<<endl;

              cout<<"press # for exit"<<endl;

              cout<<"enter your choice"<<endl;

              cin>>choice;

              switch(choice)

              {

              case '+':

                           {

                           int choice;

                           do

                           {

                                  cout<<"press 1 for integer nubmer addition"<<endl;

                    cout<<"press 2 for real number addition"<<endl;

                                  cout<<"press 3 for char number addition"<<endl;

                                  cout<<"press 4 for exit"<<endl;

                                  cout<<"enter your choice"<<endl;

                                  cin>>choice;

                                  switch(choice)

                                  {

                                  case 1:

                                         AddIntegerNumer();

                                         break;

                                  case 2:

                                         AddRealNumber();

                                         break;

                                  case 3:

                                         AddCharNumber();

                                         break;

                                  case 4:

                                         exit(0);

                                  default:

                                         cout<<"nothing match"<<endl;

                                  }

                                  cout<<"would you like to continue? press y or Y";

                                  cin>>option;

              }while(option=='y'||option=='Y');

                                 

                     }

                     break;

              case '-':

                     SubtractNumber();

                     break;

              case '*':

                     MultiplyNumber();

                     break;

              case '/':

                     DivideNumber();

                     break;

              case '%':

                     ModulusNumber();

                     break;

              case '#':

                     exit(0);

              default:

                     cout<<"nothing match"<<endl;

              }

                     cout<<"would you like to continue? press y or Y";

                     cin>>option;

              }while(option=='y'||option=='Y');

      

       getch();

}

void AddIntegerNumer()

{

       int n1,n2;

       int sum=0;

       cout<<"enter n1 and n2"<<endl;

       cin>>n1>>n2;

       sum=n1+n2;

       cout<<"sum="<<sum<<endl;

}

void AddRealNumber()

{

       int n1,n2;

       int sum=0;

       cout<<"enter n1 and n2"<<endl;

       cin>>n1>>n2;

       sum=n1+n2;

       cout<<"sum="<<sum<<endl;

}

void AddCharNumber()

{

       char ch1,ch2;

       int sum=0;

       cout<<"enter ch1 and ch2"<<endl;

       cin>>ch1>>ch2;

       sum=ch1+ch2;

       cout<<"sum="<<sum<<endl;

}

void SubtractNumber()

{

       int n1,n2;

       int subtract=0;

       cout<<"enter n1 and n2"<<endl;

       cin>>n1>>n2;

       subtract=n1-n2;

       cout<<"subtract="<<subtract<<endl;

}

void MultiplyNumber()

{

       int n1,n2;

       int multiply;

       cout<<"enter n1 and n2"<<endl;

       cin>>n1>>n2;

       multiply=n1*n2;

       cout<<"multiply="<<multiply<<endl;

}

void DivideNumber()

{

       int n1,n2;

       int division;

       cout<<"enter n1 and n2"<<endl;

       cin>>n1>>n2;

       division=n1/n2;

       cout<<"division="<<division<<endl;

}

void ModulusNumber()

{

       int n1,n2;

       int modulus;

       cout<<"enter n1 and n2"<<endl;

       cin>>n1>>n2;

       modulus=n1/n2;

       cout<<"modulus="<<modulus<<endl;

}