text: #include <stdio.h>
  
  int main(void) {
      float r;
  
      printf("Please input the r of the ball: ");
      scanf("%f", &r);
  
      float v = 4.0f / 3.0f * r * r * r * 3.14;
      printf("The ball volume is %.4f\n", v);
  
      return 0;
  }
  