c program on macros with arguments

PROGRAM ON MACROS WITH ARGUMENTS

#define PI 3.142857

#define AREA(x)PI*x*x

void main()

{

    float r,a;

    printf("Enter radius of a circle");

    scanf("%f",&r);

    a=AREA(r);

    printf("AREA of the circle=%f",a);

}

OUTPUT

Enter radius  of a circle 45

AREA of the circle6364.285645