How to make a simple calculator

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	#include <iostream.h>
#include <time.h>
#include <stdlib.h>

using namespace std;

int main()
	{
	double num1, num2;
        int opselect;

	cout << "\n welcome.";
	cout << "this is a simple calculator.";
	cout << "\n enter the first number: ";
	cin >> num1;
	cout << "enter operation: ";
	cout << "\n  1 = addition";
	cout << "\n  2 = subtraction";
	cout << "\n  3 = multiplication";
	cout << "\n  4 = division";
      cout << "\n  - ";
	cin >> opselect;
	cout << "enter the second number: ";
	cin >> num2;

	cout << "CALCULATING";
	cout << ".";
	cout << ".";
	cout << ".";

      if (num1 == 2, num2 == 2, opselect == 1)
         {
         cout << num1 << " + " << num2 << " = " << "chair" << endl;
         }
     else
     	switch (opselect)
     		{
	    	case 1:
		           	cout << num1 << " + " << num2 << " = " << num1+num2 << endl;
            		break;
            case 2:
			         cout << num1 << " - " << num2 << " = " << num1-num2 << endl;
			         break;
		    case 3:
                     cout << num1 << " X " << num2 << " = " << num1*num2 << endl;
                     break;
            case 4:
			         cout << num1 << " / " << num2 << " = " << num1/num2 << endl;
			         break;
            }
    system("PAUSE");
	return 0;
}