更多"有以下程序: #include <iostream.h> #inc"的相关试题:
[单项选择]有以下程序
#include <iostream>
#include <string>
using namespace std;
class base
private:
char baseName[10];
public:
base( )
strcpy(baseName,"Base");
virtual char *myName( )
return baseName;
char *className( )
Return baseName;
;
class Derived: public base
private:
char derivedName[10];
public:
Derived( )
strcpy(derivedName,"Derived" );
char *myName( )
return derivedName;
char *className( )
return derivedName;
;
void showPtr(base &p)
cout<<p.myName( )<<" "<<p.className( );
int main( )
base bb;
Derived dd;
showPtr(dd);
return 0;
运行后的输出结果为
A. Derived Base
B. Base Base
C. Derived Derived
D. Base Derived
[单项选择]有以下程序:
#include
usingnamespaeestd;
classMyClass
{
public:
MyClass(intn){number=n;}
//拷贝构造函数
MyClass(MyClass&other){number=other.number;}
~MyClass(){}
private:
intnumber;
};
MyClassfun(MyClassp)
{
MyClasstemp(p);
returntemp;
}
intmain()
{
MyCIassobj1(10),obj2(O);
MyClassobj3(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
usingnamespacestd;
classsample
{
private:
intX;
public:
sample(inta)
{
X=a:
}
frienddoublesquare(samples);
};
doublesquare(samples)
{
returnS.x*S.X:
}
intmain()
{
samples1(20),s2(30);
cout< return0;
}
执行结果是( )。
A. 20
B. 30
C. 900
D. 400
[单项选择]有以下程序 #include <iostream> #include <string> using namespace std; class base { private: char baseName[10]; public: base ( ) { strcpy(baseName,"Base"); } virtual char *myName( ) { return baseName; } char *className( ) { return baseName; } }; class Derived : public base { private: char derivedName[10]; public: Derived( ) { strcpy(derivedName,"Derived"); } char *myName( ) { return derivedName; } char *className( ) { return derivedName; } }; void showPtr(base &p) { cout<<p.myName ( ) <<" "<<p.className ( ); } int main ( ) { base bb; Derived dd; showPtr(dd); return 0; } 运行后的输出结果为
A. Derived Base
B. Base Base
C. Derived Derived
D. Base Derived
[填空题]有以下程序:
#include<iostream>
#include<fstream>
using namespace std;
int main( )
fstream file;
file.open("abc.txt", ios :: in);
if ( !file )
cout<<"Can not open abc.txt"<<end1;
abort( );
char buf[ 80 ];
int i = 0;
while (!file.eof( ))
file.getline(buf,80);
i++;
cout<<"Lines :"<<i<<end1;
file.close( );
return 0;
程序实现的功能是 【15】 。
[填空题]有以下程序:
#include <fstream>
#include <string>
using namespace std;
int main ( )
{
char ch[] = "The end";
ofstream outstr( "d://put.txt", ios_base: :app);
for (int i = 0; i < strlen( ch ); i++ )
outstr.put(ch[i]);
outstr.close( );
return 0;
}
程序实现的功能是 【15】 。
[单项选择]有以下程序: #include <iostream> #include <cstdlib> using namespace std; int main( ) { int arraysize; int *array; cout<<"Please input the size of the array:"; cin>>arraySiZe; array=new int[arraysize]; if(array==NULL) { cout<<"allocate Error/n"; exit(1); } for(int i=0;i<arraysize;i++) array[i]=i*i; int j; cout<<"which element you want to check:"; cin>>j; cout<<array[j]<<end1; return 0; } 执行程序输入:10<空格>5,则输出结果为( )。
A. allocate Error
B. 1
C. 0
D. 25