Help Needed- Cant get the conversion to work.

[Dominic McGrath]

include "iostream"

include <windows.h>

using namespace std;

int main()
{
int option;

cout << "Welcome to the converter\n";
cout << "Please select function you would like to convert;\n";
cout << "1 - Degrees Fahrenheit to Celsius;\n";
cout << "2 - Inches to centimeters;\n";
cout << "3 - Pound to Stones.\n";
cout << "Please enter the digit here : ";

cin >> option;

switch(digit);
    {
        case '1' :
            cout << "Please enter your Fahrenheit degrees here : ";
            cin >> number;
            answer = (number - 1) * .5556;
            cout << "Fahrenheit converted to Celsius : " << answer;
            break;

        case '2' :
            cout << "Please enter the amount of inches here : ";
            cin >> number;
            answer = number * 2.54;
            cout << "Inches converted to centimeters : " << answer;
            break;

        case '3' :
            cout << "Please enter the amount of pounds here : ";
            cin >> number;
            answer = number * 14;
            cout << "Pounds converted to stones : " << answer;
            break;
    }
return 0;

}