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#include <stdio.h>
#include <math.h>
const float PI = 3.14;
 
int main(){
  int radius;
  char color[10];
  printf("Enter the circle radius > ");
  scanf("%d", &radius);
  printf("Enter the circle color > ");
  scanf("%s", color);
 
  printf("The %s circle are = %.2f\n", color, PI*radius*radius);
 
  /* The following works if the -ansi is omitted from compilation */
  printf("The %s circle are = %.2f\n", color, M_PI*radius*radius);
  return 0;
}

prog.c: In function ‘main’:
prog.c:16:47: error: ‘M_PI’ undeclared (first use in this function)
   printf("The %s circle are = %.2f\n", color, M_PI*radius*radius);
                                               ^~~~
prog.c:16:47: note: each undeclared identifier is reported only once for each function it appears in

Standard output is empty