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1.定义一个职工类，职工类中包括职工姓名、薪水、所有职工的薪水总和（静态数据成员），定义静态成员函数，测试薪水总和的值。 Employee.h #pragma once #includeiostream using namespace std; class Employee { public: Employee(char*n,double s); ~Employee(void); double salary; static void print() { coutThe sum of salary is:countendl; }; private: static double count; char name[20]; }; Employee.cpp #include Employee.h Employee::Employee(char*n,double s) { strcpy_s(name,n); salary=s; count=count+s; } Employee::~Employee(void) { coutDeductingendl; } 02.cpp //#includeiostream //using namespace std; #includeEmployee.h double Employee::count=0; void main() { Employee e1(liu,2000); Employee e2(zhang,3000); Employee e3(hong,2500); e3.print(); } 2.由父类图形派生矩形、圆形、三角形三个子类,父类中声明了求面积的函数,在各子类中重写各自的构造函数、面积函数,但面积函数要保持相同的函数名,即达到面积函数的多态.分别声明对象进行检验. Shape.h #pragma once #includeiostream using namespace std; class shape { public: shape(void); ~shape(void); void getArea(); }; class rectangle:public shape { public: rectangle(int i,int j); void getRec(); void getArea(); private: int x,y; int area; }; class circle:public shape { public: circle(int i); void getCir(); void getArea(); private: int r; double area; }; class triangle:public shape //等边三角形 { public: triangle(int i); void getTri(); void getArea(); private: int a; double area; }; Shape0.cpp #includeiostream using namespace std; #includeshape.h rectangle::rectangle(int i,int j) { x=i; y=j; } void rectangle::getRec() { coutrectangles length=x rectangles width=yendl; } void rectangle::getArea() { area=x*y; coutrectangles area=areaendl; } circle::circle(int i) { r=i; } void circle::getCir() { coutcircles radius=rendl; } void circle::getArea() { area=3.14*r*r; coutcircles area=areaendl; } triangle::triangle(int i) { a=i; }; void triangle::getTri() { couttriangles radius=aendl; } void triangle::getArea() { area=0.433*a*a; couttriangles area=areaendl; } Shape.cpp #include shape.h shape::shape(void) { } shape::~sha