text: #include <stdio.h>
  #define PI 3.14159265359
  #define CUBE(x) (x*x*x)
  #define VOLUME(r) (1.33333333333*PI*CUBE(r))
  #define SOMME(x, y) (x+y)
  
  int	main()
  {
  	int i, N, R;
  	float total = 0;
  	
  	printf("entrer N: ");
  	scanf("%i", &N);
  	
  	for (i = 0; i < N; i++)
  	{
  		printf("entrer R: ");
  		scanf("%i", &R);
  		total = SOMME(total, VOLUME(R));
  	}
  		
  	printf("la somme des volumes des %i speheres est: %f", N, total);
  	
  	return 0;
  }