更多"有以下程序:
#include <iostream >
u"的相关试题:
[单项选择]有以下程序
#include<iostream>
using namespace std;
class Complex
{
public:
Complex(double r=O,double i=0):re(r),im(i){}
double real( ) const {return re;}
double imag( )const {return im;}
Complex operator +(Complex C) const
{return Complex (re+c.re,im+c.im);}
private:
double re,im;
};
int main( )
{
Complex a=Complex(1,1)+Complex (5);
cout<<a.real( )<<’’+’’<<a.imag( )<<’’i’’<<endl;
retum 0;
}
程序执行后的输出结果是【 】
A. 6+6i
B. 6+1i
C. 1+6i
D. 1+1i
[单项选择]有以下程序
#include<iostream>
using namespace std;
class MyClass
{
public:
MyClass(intn) {number=n;}
//拷贝构造函数
MyClass (MyClass& other) {number=other.number;}
~MyClass( ){}
private:
int number;
};
MyClass fun (MyClass p)
{
MyClass temp(p);
return temp;
}
intmain( )
{
MyClass obj1(10),obj2(0);
MyClass obj3(obj1);
obj2=fun(obj3);
return0;
}
程序执行时,MyClass类的拷贝构造函数被调用的次数是【 】
A. 5
B. 4
C. 3
D. 2
[单项选择]有以下程序 #include <iostream> using namespace std; class Complex { public: Complex (double r=0, double i =0 :re(r) ,im (i) {} double real( ) const {return re;} double imag( ) const { return im;} Complex operator + (Complex c} const {return Complex(re+c.re, im+c.im);} privane: double re,im; }; int main { Complex a =Complex(1,1)+Complex(5); cout<<a.real( )<<’+’<<a.imag( ) << ’i’ <<endl return 0; } 程序执行后的输出结果是
A. 6+6i
B. 6+1i
C. 1+6i
D. 1+1i
[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 fl( )
A::show( );
int main( )
B d(3,4);
d. fun( );
d.fl( );
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
[填空题]有以下程序
#include <iostream>
using namespace std;
class Base
{
int a;
public:
Base(int x) { a=x; }
void show( ) { cout<<a; }
class Derived: public Base
{
int b;
public:
Defived(int i):Base(i+ 1 ),b(i) {}
void show( ) { cout<<b; }
};
int main( )
{
Base b(5),*pb;
Derived d(1);
pb=&d;
pb->show( );
return 0;
}
运行后的打印结果是 【13】 。
[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