C++编程，从键盘输入圆椎体的半径R和高度H，计算其体积。

#include<iostream.h>
#define PI 3.1415926
#define V(R,H) PI*R*R*H/3

double Vol()
{
double R,H;
cout<<"请输入圆锥的半径和高："<<endl;
cout<<"R=";
cin>>R;
cout<<"H=";
cin>>H;
return V(R,H);
}
void main()
{
cout<<Vol();
}

标准C++
#include "stdafx.h"
include<iostream>
using std::cin;
using std::cout;

int _tmain(int argc, _TCHAR* argv[])
{
int r,h,c;//r是半径，h是高
cin>>r>>h;
c=r*r*3.14*h*1/3;
cout<<c;
return 0;
}

传统C++
#include<iostream.h>
void main()
{
int h,r,c;
cin>>r>>h;
c=r*r*3.14*h*1/3;
cout<<c;
}

#include "iostream.h"
main()
{
const pi = 3.1415926;
float r, h, V;
printf("inpu