Switch statement Practice(Area of Circle,Square and Rectangle)

#include <iostream.h>
#include <conio.h>
int main ()
{
    clrscr ();
    float r=0;   //for radius
    float w=0;   //for width
    float l=0;   //for length
    float z=0;  //for storing areas
    char area=' ';  //for users choice
    cout <<"Enter The Letter According To Menu\n";
    cout <<" s To Calculate Area Of Squre \n r To Calculate Area Of Rectangle \n c  To Calculate Area Of Circle \n =  ";
    cin >>area;
    switch (area)
    {
        case 's' :
            cout <<"\n Enter Length Of The Side : ";
            cin >> l;
            z=l*l;
            cout <<"\n The Area Of The Squre Is : " << z;
            break;
        case 'r' :
            cout <<"\n Enter The  Length : ";
            cin >> l;
            cout <<"\n Enter The Width : ";
            cin >> w;
            z=l*w;
            cout <<"\n The Area Of The Rectangle Is : " << z;
            break;
        case 'c' :
            cout <<"\n Enter The Radius Of THe Circle : ";
            cin >> r;
            z=3.14*(r*r);
            cout <<"\n The Area Of Circle Is : " << z;
            break;
        }
    getch();
    return 0;
}