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Turbo C - Exercise 6 Problem 1

#include<stdio.h>
#include<conio.h>

/* EXERCISE 6-1 */

main()

{
char select;
float radius;
const float pi=3.14159;
again:
clrscr();

printf("Please enter a value for radius: ");
scanf("%f", &radius);
printf("nnMenu Options (Circle): n");
printf("[a] radius n");
printf("[b] circumference n");
printf("[c] area n");
select=getche();

switch(select)
{
case 'a':
case 'A':
gotoxy(34,12);
printf("Radius: %.2f",radius);
break;

case 'b':
case 'B':
gotoxy(32,12);
printf("Circumference is: %.2f",2*pi*radius);
break;

case 'c':
case 'C':
gotoxy(34,12);
printf("Area is: %.2f", pi*radius*radius);
break;

default:
printf("nnInvalid Character!");
printf("Please try again!");
goto again;

}
getch();
}