May i know what is the problem of my C code ?

Question

https://code.sololearn.com/cpxjZog9Y5R2/?ref=app

Answer 1

no space here v
#define VOLUME_SPHERE(r)

printf should be
printf("Please input the radius");

Answer 2

VOLUME_SPHERE (r)
remove space

regards

Answer 3

#include<stdio.h>
#define PI 3.14159
#define VOL(r) ((4/3) * PI * r * r *r)
int main() {
float r;
printf ("Please input the radius\n");
scanf("%f", &r);
printf ("The volume of sphere is :\n %f\n", VOL(r));

return 0;
}