cin >> sel;switch(sel){case 1:cin >> ...;cout << getEarning(...);break;case 2:cin >> ...;cout << getEarning(...);break;case 3:cin >> ...;cout << getEarning(...);break;case 4:cin >> ...;cout << getEarning(...);break;default:break;}return 0;}来源：#include<iostream>using namespace std;double getEarning(double salary ,int absenceDays){return (salary -salary*absenceDays/22);}// admindouble getEarning(double baseSalary ,double salesSum,double rate) {return (baseSalary + salesSum*rate);}double getEarning(int workPieces,double wagePerPiece){return (workPieces*wagePerPiece);}double getEarning(double hours ,double wagePerHour){return (hours*wagePerHour);}int main(){int kind = 0 ;cout << "Please select..." << endl;cout << "1: Manager." << endl;cout << "2: Sales Man." << endl;cout << "3: Pieces Worker." << endl;cout << "4: Hour-Worker." << endl;cout << "Others: Quit" << endl;cin >> kind ;switch(kind){case 1:{double salary ;int abDays;cin>>salary>>abDays;cout<<getEarning(salary,abDays);break;}case 2:{double base ;double salesSum;double rate;cin>>base>>salesSum>>rate;cout<<getEarning(base,salesSum,rate);break;}case 3:{int workPieces;double wagePerPiece;cin>>workPieces>>wagePerPiece;cout<<getEarning(workPieces,wagePerPiece);break;}case 4:{double hours;double wagePerHour;cin>>hours>>wagePerHour;cout<<getEarning(hours,wagePerHour);break;}default:break;}// cout<<getEarning(100.0,11);// cout<<getEarning(100.0,10.0,0.1);// cout<<getEarning(100,0.2);// cout<<getEarning(200,0.3);return 0 ;}#include<iostream>using namespace std;void Math(float a , float b ,float& sum,float &sub,float&pro) {sum = a+ b ;sub = a-b ;pro = a*b ;}int main(){float sum = 0 ;float sub = 0 ;float pro = 0 ;float a = 0 ;float b = 0 ;cin>>a>>b;Math(a,b,sum,sub,pro);cout<<sum<<" "<<sub<<" "<<pro<<endl; return 0 ;}#include<iostream>using namespace std;template<class T>T cg(T &a ,T& b){T c ;c = a ;a =b ;b =c ;}int main(){int a = 0 ;int b = 0 ;char c = 0 ;char d = 0 ;cin>>a>>b>>c>>d;cout<<a<<" "<<b<<endl<<c<<" "<<d<<endl;return 0 ;}#include<iostream>#include<cmath>using namespace std;float distance(float x1,float y1,float z1,float x2=0,float y2=0,float z2=0) {return sqrt(pow(x1-x2,2)+pow(y1-y2,2)+pow(z1-z2,2));}int main(){float x1 = 0 ;float x2 = 0 ;float y1 = 0 ;float y2 = 0 ;float z1 = 0 ;float z2 = 0 ;cin>>x1>>y1>>z1>>x2>>y2>>z2;cout<<distance(x1,y1,z1)<<endl;cout<<distance(x1,y1,z1,x2,y2,z2)<<endl;return 0 ;}实习三标题：类的定义_静态常量时限：3000 ms内存限制：10000 K总时限：3000 ms描述：设计并实现一个圆柱类Cylinder，要求：（1）设计两个double型的私有数据成员：高度height和底圆半径radius。

（2）设计一个double型的公有静态常量数据成员pi（其值初始化为3.1415926），以及一个获取该常量的公有静态成员函数GetPI。

（3）在构造函数的初始化列表中初始化高度height和底圆半径radius。

（4）设计用于获取半径的成员函数GetRadius、获取高度的成员函数GetHeight、设置半径的成员函数SetRadius、设置高度的成员函数SetHeight。

（5）设计用于计算圆柱体积的成员函数Volume()、计算圆柱表面积的成员函数Area。

在main函数中：根据输入的高度和半径构造圆柱对象，并输出圆柱的基本信息、体积和表面积。

输入：圆柱的高度和底圆半径输出：圆周率pi、圆柱高度、底圆半径、圆柱的体积和表面积输入样例： 2.0 1.0输出样例：pi=3.14159, height=2, radius=1:volume=6.28319, area=18.8496 #include <iostream>using namespace std;class Cylinder{private:double height,radius;public:static const double Pi=3.1415926;Cylinder(double a=0,double b=0){height=a;radius=b;}double GetPI(){return Pi;}void GetRadius(){cin >> radius;}void GetHeight(){cin >> height;}double SetRadius(){return radius;}double SetHeight(){return height;}double Volume(){return Pi*radius*radius*height;}double Area(){return 2*Pi*radius*height+2*Pi*radius*radius; }};int main(){Cylinder y;y.GetHeight();y.GetRadius();cout << "pi=" << y.GetPI() << "," << " ";cout << "height=" << y.SetHeight() << "," << " "; cout << "radius=" << y.SetRadius() << ":" ;cout << "volume=" << y.Volume() << "," <<" ";cout << "area=" << y.Area() <<endl;return 0;}描述：设计并实现一个动态整型数组类Vect，要求：（1）实现构造函数重载，可以根据指定的元素个数动态创建初始值为0的整型数组，或根据指定的内置整型数组动态创建整型数组。