Visual C++面向对象程序设计第四章习题答案

public: test(); ~test(); void print(); };

//test.cpp

#include using namespace std; #include\ test::test() {

cout<<\输出无参构造函数\ x=0; }

test::~test() {

cout<<\输出无参析构函数\ }

void test::print() {

cout<<\ }

//main.cpp

#include #include\

using namespace std;

void main() {

test obj1,obj2;

}

obj1.print(); obj2.print();

4.16试设计程序，演示有对象成员时构造成员时构造函数和析构函数的调用顺序。

#include using namespace std; class Test1

{

private: int x1; public:

Test1( ) :x1(0) { cout<<\构造函数1被执行\ }

Test1(int i):x1(i) { cout<<\构造函数1被执行\ }

~Test1( ) { cout<<\析构函数1被执行\ } };

class Test2 {

private:

Test1 x2; int x3; public:

Test2(int i,int j ) :x2(i) { x3=j; cout<<\构造函数2被执行\ }

~Test2( ) { cout<<\析构函数2被执行\ } };

void main() {

}

Test2 obj(5,6);

4.17 设计一个含有指针类型数据成员的类，自定义构造函数、拷贝构造函数、析构函数和基本赋值运算符函数。

#include #include using namespace std; class student

{

private: int age; char *name; public:

student(int i,char *n=\ { name=new char [strlen(n)+1]; strcpy(name ,n); }

~student() { delete []name; }

student(const student & s):age(s.age) { name=new char[strlen(s.name)+1]; strcpy(name,s.name); }

student & operator =(student & s) { if(this!=&s) { age=s.age; delete []name; name=new char[strlen(s.name)+1]; strcpy(name,s.name); } return *this; } display() { cout<<\ } };

void main() {

student s1(20,\ s1.display(); student s2=s1; s2.display();

student s3(21,\ s3.display();