Calculator

This is my Calculator program. In this program you can enter the entire expression instead of only 2 numbers.Try it and comment below.

#include<iostream>

#include<conio.h>

using namespace std;

void main()

{

int a,b;

char c;

system("cls");

cout << "Enter the expression....";

cout << "\nPress '= 'after entering expression....";

cin >> a;

do

{

cin >> c;

switch (c)

{

case '+':cin >> b; a += b; break;

case '-':cin >> b; a -= b; break;

case '*':cin >> b; a *= b; break;

case '/':cin >> b; a /= b; break;

}

} while (c != '=');

cout << a;

_getch();

}