Switch statement Practice(Square and Cube)

#include <iostream.h>
#include <conio.h>
int main ()
{
    clrscr ();
    int a=0;
    char x=' ';
    cout <<"\n Enter THe Number Whose Squre And Cube You Want To Calculate : ";
    cin >> a;
    cout <<"\n\n Now Press s To Start Calculations   =  ";
    cin  >>x;
    switch (x)
    {
        case 's' :
            a=a*a;
            cout <<"Squre Is : " << a <<endl;
        a=a*a;
        cout <<"Cube Of The Number Is = " << a;
    }
    getch();
    return 0;
}