//已知圆柱体的半径和高，求圆柱体的体积。#include 
     
      #include 
      
       using namespace std;int main(){   //首次使用const来规定常量；在C语言中会使用#DEFINE    const float PI = 3.14f;    float radius = 4.5f;    float height = 28.7f;    double volume = PI * pow(radius, 2) * height;    cout << "the volume is " << volume << endl;    cin.get();    return 0;}