C面向对象程序设计练习题.doc

《面向对象程序设计》练****题
一、单项选择题
(1)若有以下类定义
class MyClass {
public:
MyClass() { cout << 1; }
};
则执行语句MyClass a,b[2],*p[2];后,程序的输出结果是( B )
A)11 B)111 C)1111 D)11111
(2)下面程序的输出结果是( B )
#include <iostream>
using namespace std;
int i = 0;
int fun(int n)
{
static int a = 2;
a++;
return a+n;
}
void main()
{
int k = 5;
{
int i = 2;
k += fun(i);
}
k += fun(i);
cout << k;
}
A)13 B)14 C)15 D)16
(3)下面程序的输出结果是( A )
#include <iostream >
using namespace std;
void swap1( int &v1, int &v2)
{
int tmp = v2;v2 = v1;v1 = tmp;
}
void swap1( int *v1, int *v2)
{
int tmp= *v2;*v2 = *v1;*v1 = tmp;
}
void main()
{
int i = 10, j = 20; swap1(i,j); swap1(&i,&j);
cout<<i<<”,”<<j<<endl;
}
A)10,20 B)20,10 C)10,10 D)20,20
(4)下面的程序段的运行结果为( D )
char str[] = "job", *p = str;
cout << *(p+2) << endl;
A)98 B)无输出结果 C)字符’b’的地址 D)字符’b’
(5)下面程序的输出结果是( C )
#include <iostream>
using namespace std;
class A
{
public:
A (int i) { x = i; }
void dispa () { cout << x << “,”; }
private :
int x ;
};
class B : public A
{
public:
B(int i) : A(i+10) { x = i; }
void dispb() { dispa(); cout << x << endl; }
private :
int x ;
};
void main()
{
B b(2);
();
}
A)10,2 B)12,10 C)12,2 D)2,2
(6)下面程序的输出结果是( C )
#include <iostream>
using namespace std;
class Base
{
public:
Base(int i) { cout << i; }
~Base () { }
};
class Base1: virtual public Base
{
public:
Base1(int i, int j=0) : Base(j) { cout << i; }
~Base1() {}
};
class Base2: virtual public Base
{
public:
Base2(int i, int j=0) : Base(j) { cout << i; }
~Base2() {}
};
class Derived : public Base2, public Base1
{
public:
Derived(int a, int b, int c, int d) : mem1(a), mem2(b), Base1(c),
Base2(d), Base(a)
{ cout << b; }
private:
Base2 mem2;
Base1 mem1;
};
void main() { Derived objD (1, 2, 3, 4); }
A)134122 B)123412 C)14302012 D)143212
(7)以下程序对一维坐标点类Point进行运算符重载,输出结果是( A )
#include <iostream>
using namespace std;
class Point {