C++ Standard Calculator for Addition & Subtraction

[speedyclock]

//Okay,  set up primary include statements and predefined functions
#include <iostream>
#include <CMATH>

//Set up our Primary Function,  this will not be a class,  but a simple program
int main()
{
//Now that we got some space,  let's get the namespace down
using namespace std;
//Now for the Variables
int op;
int cn;
int sn;
int co;
int constant = 1;

       cout << "Enter your first number! : ";
       cin >> cn;
       cout << endl;
//Now to get the main loop up,  I will use a while loop
while (constant == 1){
    cout << "Enter 1 to add, 2 to subtract, 3 to abort,  Please enter an null second number after aborting for the program to shut down : ";
    cin >> op;
    cout << endl << "Now enter your second number pl0x : ";
    cin >> sn;
    cout << endl;
    if (op == 1) {
    cn = cn + sn;
    }
    else if (op == 2) {
    cn = cn - sn;
    }
    else if (op = 3) {
         cout << "Program Aborted";
         cout << endl;
         system("pause");
         return 0;
         }
    constant = 2;
      }
//Now we have the standard startup statements up.  Now we are going to make it so the calculator continues to calculate
while (constant == 2) {
      cout << "Current number : " << cn << "!" << " What is your next Operation (Add 1, Sub 2) : ";
      cin >> op;
      cout << endl << "Now what is your second number :";
      cin >> sn;
      cout << endl;
      if (op == 1){
         cn = cn + sn;
         }
      else if (op == 2) {
        cn = cn - sn;
           }
      }
}


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Tell me what you think

I know that other operations can be easily programmed into this. But it's too much of a pain and this was merely a proof of concept. It took me 20 minutes.

[Draxorion]

This is awesome. I understand parts here and there. After your lessons of course.

[speedyclock]

Yes, you'll notice the while loops are similar to the if and else if commands.

But instead of simply picking the statement and running it, it will continuously run it unless the parenthesis rule changes. (Parameter is the correct word of the rule inside the parenthesis)