关于圆的问题的C++

#include<iostream>

#include<iomanip>

using namespace std;

int main()

{

float r, h, c, s,V,S,v;  //c是圆周长，s是圆面积，V是圆球体积，S是圆球表面积

float pi = 3.141592;      //v是圆柱体积

cout << "piease enter r,h:";

cin >> r >> h;

c = 2 * pi*r;

    s = r * r*pi;

V = (4.0 / 3.0)*pi*r*r*r;

S = 4 * pi*r*r;

v = pi * r*r*h;

cout << setiosflags(ios::fixed) << setiosflags(ios::right)

<< setprecision(2);

cout << "c=" << c << endl;

cout << "s=" << s << endl;

cout << "V=" << V << endl;

cout << "S=" << S << endl;

cout << "v=" << v << endl;

return 0;

}