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C++

一套C++笔试题面试题

2016-05-13 09:34:17 admin 返回上一页

一、问答题

1.请说明类的纯虚函数、虚函数、静态成员函数、普通成员函数的区别。

2.什么情况下,类的析构函数应该声明为虚函数?为什么?

3.对于下面的代码:

class myString;
myString *pStringArray = new myString[13];
以下两种delete有什么区别?

delete pStringArray;
delete []pStringArray;
二、说明题

下列题目,请写出输出结果,并要求说明原因。

4.下面的函数调用输出什么?

void Test()
{
char *p = “Test”;

cout << &p << endl;
cout << p << endl;
cout << *p << endl;
cout << p[0] << endl;

void *q = “Test”;

cout << &q << endl;
cout << q << endl
}
5.有如下的类:

class CBase
{
public:
virtual void Test() const { cout << “Output from CBase!” << endl; };
};

class CDerived : public CBase
{
public:
virtual void Test() const { cout << “Output from CDerived!” << endl; };
};
下面是两个函数:

void Test1(CBase test)
{
test.Test();
}

void Test2(const CBase& test)
{
test.Test();
}
请问调如下的函数输出什么?

void Test()
{
CDerived oTest;

Test1(oTest);

Test2(oTest);
}
6.有如下的类:

class B
{
public:
B() { cout << “Output from the constructor of class B!” << endl; }
~B() { cout << “Output from the destructor of class B!” << endl; }
};

class D1 : public B
{
public:
D1(int n) { cout << “The integer value is: ” << n << endl; };
~D1() { cout << “Output from the destructor of class D1!” << endl; };
};

class D2 : public B
{
public:
D2(int n) { cout << “The integer value is: ” << n << endl; };
~D2() { cout << “Output from the destructor of class D2!” << endl; };
};

class CTest
{
public:
CTest() : d2(2), d1(1) {};
~CTest() {};

private:
D1 d1;
D2 d2;
};
请问调如下的函数输出什么?

void Test()
{
CTest test;
}

7.有如下的类:

class CBase
{
public:
virtual void Test() const { cout << “Output from CBase!” << endl; };
};

class CDerived : public CBase
{
public:
void Test() const { cout << “Output from CDerived!” << endl; };
};
请问调如下的函数输出什么?

void Test()
{
CDerived? d;

CBase *pB = &d;
pB->Test();

CDerived? *pD = &d;
pD->Test();
}
8.如果把上题中类CBase的Test方法改为非虚函数,输出又是什么?

9.有如下的类:

class CBase
{
public:
virtual void Test(int iTest = 0) const? = 0;
};

class CDerived : public CBase
{
public:
void Test(int iTest = 1) const { cout << iTest << endl; };
};
请问调如下的函数输出什么?

void Test()
{
CBase *p = new CDerived;

p->Test();

delete p;
}
三、分析题

有如下的复数类:

class complex
{
public:
complex(double r = 0.0, double i = 0.0) { re = r; im = i; };

double real() const { return re; };
double image() const { return im; };

private:
double re;
double im;
};

complex operator+(const complex& left, const complex& right)
{
return complex(left.real() + right.real(), left.image() + right.image());
}

complex operator*(const complex& left, const complex& right)
{
return complex(left.real()*right.real() – left.real()*right.image(), left.real()*right.image() + left.image()*right.real());
}
请分析:

10.没有把运算符重载设置为类的成员函数有什么好处?

11.能不能把函数参数前面的const去掉?为什么?

12.类的成员函数real()和image()后面的const表示什么?这样写有什么好处?


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