程序代码：

//给一个圆桶刷油漆的价钱
#include <iostream>
using namespace std;
class box
{
private:
    float h;
    float r;
    float v;
    float s;
    float w;
    bool tf;
    float color[3];
    int i;
    
public:
    float volume(float h,float r);
    float zong();
    float area(float h,float r,bool tf);
    box(int z,int x,int f);
    box();
};
float box::volume(float h,float r)
{
    v = h*r*r*3.14;
    return v;
}
float box::area(float h,float r,bool tf)
{
    if (tf)
        s = 2 * 3.14*r*h + 2 * 3.14*r*r;
    else
        s = 2 * 3.14*r*h + 3.14*r*r;
    return s;

}
float box::zong()
{
    cout<<"油漆颜色（0-红色，1-蓝色，2-绿色）"<<endl;
    cin>>i;
    w = s*color[i];
    return w;
}
box::box()
{}
box::box(int z,int x,int f)
{
    color[0]=z;
    color[1]=x;
    color[2]=f;
}
void main()
{
    box m;
    float a,b,d;
    bool c;
    box(3,4,5);
    cout << "请输入该圆桶的高度和半径(单位：米)：" << endl;
    cin >> a >> b;
        cout<<"该圆桶体积为"<<m.volume(a,b)<<" m3"<<endl;
    cout << "有盖子吗？（有-1，无-0）" << endl;
    cin >> c;
    m.area(a,b,c);
    d=m.zong();
    cout <<"总造价为："<<d<<" 元"<<endl;

}[local]1[/local]

[此贴子已经被作者于2016-4-20 22:05编辑过]