若有以下程序:
#include <iostream>
using namespace std;
class Base

private:
int a,b;
public:
Base(int x, int y)

a=x;
b=y;

void show( )

cout<<a<<", "<<b<<end1;

;
class Derive : public Base

private:
int c, d;
public:
Derive(int x, int y, int z,int m):Base(x,y)

c=z;
d=m;

void show( )

cout<<c<<", "<<d<<end1;

;
int main ( )

Base b(50,50) ,*pb;
Derive d(10,20,30,40);
pb=&d;
pb->show );
return 0;

题库:计算机等级考试 类型:最佳选择题 时间:2017-07-03 15:13:20 免费下载:《单选题》Word试卷

若有以下程序:
#include <iostream>
using namespace std;
class Base

private:
int a,b;
public:
Base(int x, int y)

a=x;
b=y;

void show( )

cout<<a<<", "<<b<<end1;

;
class Derive : public Base

private:
int c, d;
public:
Derive(int x, int y, int z,int m):Base(x,y)

c=z;
d=m;

void show( )

cout<<c<<", "<<d<<end1;

;
int main ( )

Base b(50,50) ,*pb;
Derive d(10,20,30,40);
pb=&d;
pb->show );
return 0;

A.10,20
B.30,40
C.20,30
D.50,50

若有以下程序:  #include <iostream>  using namespace std;  class Base    private:    in

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