C Program for Macros with arguments

/* Macros with arguments */
#define AREA(x) ( 3.14 * x * x )
main( )
{
float  r1 = 6.25, r2 = 2.5, a ;
a = AREA ( r1 ) ;
printf ( "\nArea of circle = %f", a ) ;
a = AREA ( r2 ) ;
printf ( "\nArea of circle = %f", a ) ;
}