発展3
#include <stdio.h> int main() { int r,N,i; printf("Please input two integers as radius and resolutin : "); scanf("%d%d",&r,&N); double ans = 0,sa = ( (double)r / (double)N ),nau = 0,pai = 3.141592653589793238462643383279; for(i = 1;i <= N;i++){ nau += sa; ans += 4*pai*nau*nau*sa; } printf("Volume of sphere with r=%d : %f\n",r,ans); return 0; }