C Assignments to find circumference of circle in C

C Assignments to find circumference of circle in C | circumference of Circle in C | Find circumference in C | C Assignment to find circumference of Circle in C

main()

{
 float r,circumference;
 clrscr();

 printf ("enter value for r");

 scanf("%f",&r);
 circumference=2*3.14*r;

 printf("  %f",circumference);

 getch();
}