更多"若有以下程序: #include<iostream> usingn"的相关试题:
[单项选择]若有以下程序: #include<iostream> usingnamespacestd; classA { private: int x; public: int x; void setx(int i) { x=i; } int getx( ) { return x; } }; class B:public A { private: int m; public: int p; void setvalue (int a,int b,int C) { setx(A) ; z=b; m=c; } void display( ) { cout<<getx( )<<","<<z<<","<<m<<end1; } }; int main( ) { B obj; obj.setvalue(2,3,4); obj.display( ); return 0; } 程序运行以后的输出结果是
A. 产生语法错误
B. 2,3,4
C. 2,2,2
D. 4,3,2
[单项选择]若有以下程序 #include <iostream> using namespace std; class A { private: int a; public: A(int i) { a=i; } void disp( ) { cout<<a<<","; } }; class B { private: int b; public: B(int j) { b=j; } void disp( ) { cout<<b<<","; } }; class C: public B,public A { private: int c; public: C(int k):A(k-2),B(k+2) { c=k; } void disp( ) { A::disp( ); B::disp( ); cout<<c<<end1; } }; int main( ) { C obj(10); obj.disp( ); return 0; } 程序执行后的输出结果是
A. 10,10,10
B. 10,12,14
C. 8,10,12
D. 8,12,10
[单项选择]若有以下程序 #include <iostream> using namespace std; class A { public: A(int i,int j) { a=i; b=j; } void move(int x, int y) { a+=x; b+=y; } void show( ) { cout < <a < <" , " <<b<< end1; } private: int a,b; }; class B : private A { public: B(int i,int j) :A(i,j) {} void fun ( ) { move (3, 5); } void f1 ( ) { A::show( ); } }; int main ( ) { B d(3,4); d. fun ( ); d.f1( ); return 0; } 程序执行后的输出结果是 ( )。
A. 3,4
B. 6,8
C. 6,9
D. 4,3
[单项选择]若有以下程序:
#include <iostream>
using namespace std;
class Base
public:
Base( )
x=0;
int x;
;
class Derivedl: virtual public Base
public:
Derivedl( )
x=10;
;
class Derived2: virtual public Base
public:
Derived2( )
(
x=20;
;
class Derived: public Derivedl,protected Derived2 ;
int main( )
Derived obj;
cout<<obj.x<<end1;
return 0;
该程序运行后的输出结果是
A. 20
B. 30
C. 10
D. 0
[单项选择]若有以下程序:
#include <iostream>
using namespaces std;
class A
public:
A( )
A(int i)
x1=i;
void dispa( )
cout<<’x1="<<x1<<",";
private:
int x1;
;
class B: public A
public:
B( )
B(int i):A(i+10)
x2=i;
void dispb( )
dispa( );
cout<<"x2="<<x2<<end1;
private:
int x2;
;
int main( )
B b(2);
b.dispb( ):
return 0;
程序运行后的输出结果是
A. x1=10,x2=2
B. x1=12,x2=10
C. x1=12,x2=2
D. x1:2,x2=2