text: #include <math.h>
  #include <stdio.h>
  #include <stdlib.h>
  
  #define nuke(radius, power) (4 * M_PI * pow(radius, power))
  
  int main(int argc, char **argv) {
    if (argc < 2) {
      printf("Uso: e9 radio\n");
      return 1;
    }
  
    float radius = atof(argv[1]);
  
    float area = nuke(radius, 2);
    float volume = nuke(radius, 3) / 3;
  
    printf("Area: %.2f\n", area);
    printf("Volume: %.2f\n", volume);
  
    return 0;
  }
  