#include <iostream.h>
 
int Add(int num1, int num2);
int Subtract(int num1, int num2);
int Multiply(int num1, int num2);
int Divide(int num1, int num2);
 
// The main procedure. When the program starts, it goes here.
int main(int argc, char *argv[])
{
  int x, y;      // Integers 'x' and 'y' - The two numbers to add
  int doNum;     // Integer 'doNum' - Add, Subtract, Multiply, or Divide?
  int b=1;       // Integer 'b' - App runs while b = 1
 
  while(b==1)
  {
    cout<<"Please enter two numbers with a space inbetween.press enter: ";
    cin>>x>>y;
 
    cout<<"Pleas press the number of what you want to do, press enter: "<<endl;
    cout<<"1. Add"<<endl;
    cout<<"2. Subtract"<<endl;
    cout<<"3. Multiply"<<endl;
    cout<<"4. Divide"<<endl;
    cin>>doNum;
 
    switch (doNum)
    {
      case 1:
        cout<<x<<" plus "<<y<<" = "<<Add(x, y)<<endl;
        break;
      case 2:
        cout<<x<<" minus "<<y<<" = "<<Subtract(x, y)<<endl;
        break;
      case 3:
        cout<<x<<" multiplied by "<<y<<" = "<<Multiply(x, y)<<endl;
        break;
      case 4:
        cout<<x<<" divided by "<<y<<" = "<<Divide(x, y)<<endl;
        break;
    }  //switch
  }  //while
 
  return 0;
}
 
// This function adds two variables
int Add(int num1, int num2)
{
  return num1+num2;
}
 
// This function subtracts two variables
int Subtract(int num1, int num2)
{
  return num1-num2;
}
 
// This function multiplies two variables
int Multiply(int num1, int num2)
{
  return num1*num2;
}
 
// This function divides the first variable by the second
int Divide(int num1, int num2)
{
  return num1/num2;
}