3.7

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7.(1) #include <iostream>

using namespace std;

class Student

{

public:

Student(int n,float s):num(n),score(s){}

void change(int n,float s)

{

num=n;

score=s;

}

//void display()

void display()const

{

cout<<num<<" "<<score<<endl;

}

private:

int num;

float score;

};

int main()

{

//Student stud(101,78.5);

const Student stud(101,78.5);

stud.display();

//stud.change(101,80.5);

//stud.display();

return 0;

}

(2) #include <iostream>

using namespace std;

class Student

{

public:

Student(int n,float s):num(n),score(s){}

//void change(int n,float s)

void change(int n,float s)const

{

num=n;

score=s;

}

//void display()

void display()const

{

cout<<num<<" "<<score<<endl;

}

private:

//int num;

mutable int num;

//float score;

mutable float score;

};

int main()

{

//Student stud(101,78.5);

const Student stud(101,78.5);

stud.display();

stud.change(101,80.5);

stud.display();

return 0;

}

(3) #include <iostream>

using namespace std;

class Student

{

public:

Student(int n,float s):num(n),score(s){}

void change(int n,float s)

{

num=n;

score=s;

}

void display()

{

cout<<num<<" "<<score<<endl;

}

private:

int num;

float score;

};

int main()

{

Student stud(101,78.5);

Student *p=&stud;

p->display();

p->change(101,80.5);

p->display();

return 0;

}

(4) #include <iostream>

using namespace std;

class Student

{

public:

Student(int n,float s):num(n),score(s){}

//void change(int n,float s)

void change(int n,float s)const

{

num=n;

score=s;

}

//void display()

void display()const

{

cout<<num<<" "<<score<<endl;

}

private:

//int num;

mutable int num;

//float score;

mutable float score;

};

int main()

{

//Student stud(101,78.5);

const Student stud(101,78.5);

stud.display();

const Student *p = &stud;

//stud.change(101,80.5);

p->change(101,80.5);

//stud.display();

p->display();

return 0;

}

(5)#include <iostream>

using namespace std;

class Student

{

public:

Student(int n,float s):num(n),score(s){}

//void change(int n,float s)

void change(int n,float s)const

{

num=n;

score=s;

}

//void display()

void display()const

{

cout<<num<<" "<<score<<endl;

}

private:

//int num;

mutable int num;

//float score;

mutable float score;

};

int main()

{

//Student stud(101,78.5);

const Student stud(101,78.5);

stud.display();

const Student *p = &stud;

//stud.change(101,80.5);

p->change(101,80.5);

//stud.display();

p->display();

return 0;

}

(5)#include <iostream>

using namespace std;

class Student

{

public:

Student(int n,float s):num(n),score(s){}

//void change(int n,float s)

void change(int n,float s)const

{

num=n;

score=s;

}

//void display()

void display() const

{

cout<<num<<" "<<score<<endl;

}

private:

//int num;

mutable int num;

//float score;

mutable float score;

};

int main()

{

//Student stud(101,78.5);

const Student stud(101,78.5);

stud.display();

//const Student *p = &stud;

Student * const p=&stud;

//stud.change(101,80.5);

//p->change(101,80.5);

//stud.display();

p->display();

return 0;

}

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