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1构造一个类，含有3个数据成员，为长方体的长、宽、高，含有一个成员函数，用来计算长方体的体积 #include “stdafx.h” #include cla cub { private: double a,b,c;public: void setabc(double,double,double);double volu(void);};void cub::setabc(double x,double y,double z){a=x;b=y;c=z;} double cub::volu(void){return a*b*c;} void main(){ cub cuba;cuba.setabc(3,4,5);cout cla cub { private: double a,b,c;public: void setabc(double x,double y,double z){
a=x;b=y;c=z;} double volu(void){
return a*b*c;} };int main(int argc, char* argv[]){
cub cuba;cuba.setabc(3,4,5);cout
设计一个学生类，包含学生的姓名，数学，物理，英语课程成绩，计算学生的平均成绩 #include “stdafx.h” #include cla stu { private: double a,b,c;public: void setabc(double x,double y,double z){
a=x;b=y;c=z;} double average(void){
return(a+b+c)/3;} void show(void){
cout
cout
stu Yin;Yin.setabc(80,81,82);cout #define pI 3.14 cla circle { private: double radius;public: circle(double x=0){radius=x;} circle(circle &t)
//拷贝
{ radius=t.radius;} double peri(void){return 2*pI*radius;} double area(void){return pI*radius*radius;}
void show(void){cout
cout
cout
cout
circle circlea(3);circle circleb(circlea);
circlea.show();
cout #include cla Rect { public: double a,b;Rect(double x,double y){
a=x;b=y;
} double area(void){
return a*b;} void showA(void){
cout
cout
cla Cub:public Rect { private: double H;public: Cub(double x,double y,double h):Rect(x,y){H=h;} double volume(){return area()*H;} double Aarea()//表面积
{return(2*a*b+2*b*H+2*b*H);} void showB(void){
cout
cout
cout
void main(int argc, char* argv[]){
Cub abc(3,4,4);cout
a=x;b=y;r=z;} double area1()//圆的面积
{
return PI*r*r;
} double area2(){
return a*b;}
//长方形面积
void showA(){
cout
cout
cout
cout
cla sphere:public shape
//圆类 {
public: sphere(double z):shape(0,0,z)
{
}
double Aarea1()
{
return 4*PI*r*r;
}
double volume1()
{
return(4*PI*r*r*r)/3;
}
void showC(void)
{
cout
cout
}
};cla cube:public shape
//长方体类
{ private:
double h;public:
cube(double x,double y,double z):shape(x,y,z)
{ h=z;}
double Aarea2()
{
return 2*(a*b+a*h+b*h);
}
double volume2()
{
return area2()*h;
}
void showD(void)
{
cout
cout
cout
}
};
void main(int argc, char* argv[]){
sphere yuan(1);
cout
yuan.showA();
//abc.showB();
yuan.showC();
cube chang(1,2,3);
cout
chang.showB();
chang.showD();}
四则运算：
#include #include cla CA { private: int D1,D2;char Opr;public: long GetResult(){
switch(Opr)
{
case '+': return D1+D2;break;
case '-': return D1-D2;break;
case '*': return D1*D2;break;
case '/': if(D2!=0)return D1/D2;
else{
cout
default:
{
cout
} } }
void SetOpr(char opr){ switch(opr){ case '+': case '-': case '*': case '/':
Opr=opr;break;default:Opr=' ';} }
void SetData(int d1,int d2){ D1=d1;D2=d2;}
int GetD1(){return D1;}
int GetD2(){return D2;} };
int main(int argc, char* argv[]){ CA calc;calc.SetData(3,2);
calc.SetOpr('*');cout
++双目
#include “stdafx.h” #include #include cla Rect { private: double a,b;public: //Rect()//{cout
a=x;b=y;
cout
return a*b;} void showA(void){
cout
cout
cout
~Rect(){cout
a+=5,b+=5;return *this;} };void main(int argc, char* argv[]){ Rect abc(2,3);
abc.showA();
cout
abc++;
abc.showA();
//cout
