软件工程师笔试题

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软件工程师笔试题篇1

考察虚继承内存体系

class A

{

public:

A { cout<<"Construct A"<

~A { cout<<"Destruct A"<

void speak { cout<<"A is speaking!"<

};

class B:public virtual A

{

public:

B { cout<<"Construct B"<

~B { cout<<"Destruct B"<

};

class C:public virtual A

{

public:

C { cout<<"Constuct C"<

~C { cout<<"Destruct C"<

};

class D:public B, public C

{

public:

D{ cout<<"Constsruct D"<

~D{ cout<<"Destruct D"<

};

int main

{

D *p = new D;

p->speak;

delete p;

}

输出：

Construct A

Construct B

Constuct C

Constsruct D

A is speaking!

Destruct D

Destruct C

Destruct B

Destruct A

软件工程师笔试题篇2

考察非虚析构函数

1、class Parent

{

public:

Parent{cout<<"Parent construct"<

~Parent{ cout<<"Parent destruct "<

};

class Child : public Parent

{

public:

Child { cout<<"Child construct "<

~Child {cout<<"child destruct"<

};

int main

{

Parent *p;

Child *c = new Child;

p = c;

delete p; 因为析构函数是非virtual的，故析构的时候按照指针的类型进行析构

}

输出：

Parent construct

Child Construct

Parent destruct

2、 考察初始化列表的写法

class A

{

public:

A(int x, int y, int z):a=x,b=y,c=z (1)

A(int x, int y, int z):a(x),b(y),c(z) (2)

private:

int a;

int b;

int c;

};

int main

{

A a(1,2,3);

}

软件工程师笔试题篇3

1、考察拷贝构造函数和赋值的区别。

class A

{

public:

A { cout<<"Construct A by default"<

A(const A& a) { cout<<"consttuct A by copy"<

A& operator =(const A& a) { cout<<"cosnt A by operator ="<

~A { cout<<"Destruct A"<

};

int main

{

A a;

A b=a; //调用拷贝构造函数

A c(a); //调用拷贝构造

A d;

d=a; //赋值

}

输出：

Construct A by default //构造对象a

consttuct A by copy //拷贝构造b

consttuct A by copy //拷贝构造c

Construct A by default //构造a

cosnt A by operator = //赋值d=a

Destruct A

Destruct A

Destruct A

Destruct A

2、 考察函数指针

void func(char* a)

{

cout<

}

int main

{

void (*fp)(char*); //填空处

fp = func; //函数名func相当于函数的地址，将其赋给函数指针fp

char* s="helloc";

fp(s);

}