Calculator

I tried to make a very simple calculator. It works as such :

Open the file...
Hit [ENTER]....
Type in one (1) number
[Enter]
Type in addition sign : +
[enter]
type in another number
[enter]
the result....wrong

Anyway, here is the code...any suggestions?

Code:

#include <iostream>
using namespace std;
int main () {
    int first;
    int second;
    int answer;
    char sign;
    cout<<"~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n";
    cout<<"~~~~                 Calculator                      ~~~~\n";
    cout<<"~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n";
    cin>>first;
    cin>>sign;
    cin>>second;
    if (sign=='+') {
        answer = first + second;
        cout<<answer;
        }
    if (sign=='-') {
        answer = first - second;
        cout<<answer;
        }
    if (sign=='*') {
        answer = first * second;
        cout<<answer;
        }
    if (sign='/') {
        answer = first / second;
        cout<<answer;
        }
    cin.get();
    cin.get();
    return 0;
}

Thanks so much!

Code:

    if (sign='/') {

should be:

Code:

    if (sign=='/') {

Thanks so much!