C Language - #include and #define

 

#include <stdio.h>

#define PI 3.14

#define SQUARE(x) x*x

int main()

{  

int b=34;

int c=345;

float d=PI;

int x=5;

printf ("the value of b is %d\n", b);

printf ("the value of c is %d\n", c);

printf ("the value of PI is %f\n", d);

printf ("the area of a circle is %f\n",PI * SQUARE (x));

} 

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