Define macro: constant : Macro Constant « Macro Preprocessor « C / ANSI-C

Define macro: constant

/* Define macro */
#include <stdio.h>

#define  PI 3.14159f                  /* Definition of the symbol PI */

void main()
   float radius = 0.0f;
   float diameter = 2.0f;
   float circumference = 0.0f;
   float area = 0.0f;

   radius = diameter/2.0f;
   circumference = 2.0f*PI*radius;
   area = PI*radius*radius;
   printf("\nThe circumference is %.2f", circumference);
   printf("\nThe area is %.2f", area);


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