1.
#include
class Simple{
int x,y;
public:
Simple() {x=y=0;}
Simple(int i,int j) {x=i;y=j;}
void copy(Simple&s);
void setxy(int i,int j) {x=i;y=j;}
void print() {cout<<"x="<<x<<",y="<<y<<endl;}
};
void Simple::copy(Simple&s）
{
x=s.x; y=s.y;
}
void func(Simple s1,Simple&s2)
{
s1.setxy(30,40);
s2.setxy(70,80);
}
void main()
{
Simple obj1(1,2),obj2;
obj2.copy(obj1);
func(obj1,obj2);
obj1.print();
obj2.print();
}
2.
#include
class Complex{
double re,im;
public:
Complex(double r,double i):re(r),im(i){}
double real()const {return re;}
double image()const {return im;}
Complex& operator+=(Complex a)
{re+=a.re;
im+=a.im;
return*this;
}
};
ostream&operator<<(ostream&s,const Complex&z)
{return s<<'('<<z.real()<<','<<z.image()<<')';}
int main()
{Complex x(1,-2),y(2,3);
cout<<(x+=y)<<endl;
return 0;
}
3.
#include
class Toy{
public:
Toy(char* _n) {strcpy(name,_n);count++;}
~Toy() {count--;}
char* GetName() {return name;}
static int getCount() {return count;}
private:
char name[10];
static int count;
};
int Toy::count=0;
int main(){
Toy t1("Snoopy"),t2("Mickey"),t3("Barbie");
cout<<t1.getCount()<<endl;
return 0;
}
4.
#include
class Base{
public:
void fun1() {cout<<"Base\n";}
virtual void fun2() {cout<<"Base\n";}
};
class Derived:public Base{
public:
void fun1() {cout<<"Derived\n";}
void fun2() {cout<<"Derived\n";}
};
void f(Base&b) {b.fun1(); b.fun2();}
int main()
{
Derived obj;
f(obj);
return 0;
}
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