更多"[C++代码]
#include <iostream>
con"的相关试题:
[简答题]#include<iostream>
#include<fstream>
#include<string>
using namespace std;
class A
public:
A(const char*na)strcpy(name,na);
private:
char name[80];
;
class B:public A
public:
B(const char*nm):A(nm)
void show( );
;
void B::show( )
cout<<"name:"<<name<<endl;
void main( )
B b1("B");
b1.show( );
[填空题]#include<iostream>
#include<string>
using namespace std;
template<class T>
T Max(T a,T b)
return a>b a:b;
T Min(T a,T b)
return a>b b:a;
void main( )
tout<<"Max(3,5)is:"<<Max<double>(3,5)<<endl;
cout<<"Min(3,5)is:"<<Min<int>(3,5)<<endl;
[单项选择]有如下程序 #include <iostream> #include <iomanip> using namespace std; class MyClass { public: MyClass( ) { cout<<’A’; } MyClass(char c){ cout<<c; } ~MyClass( ){ cout<<’B’; } }; int main( ) { MyClass p1,*p2; p2=new MyClass(’X’); delete p2; return 0; } 执行这个程序屏幕上将显示输出
A. ABX
B. ABXB
C. AXB
D. AXBB
[填空题]有如下的程序:
#include<iostream>
#include<fstream>
using namespace std;
int main( ){
char s[25]="Programming language";
ofstream f1("DATA. TXT");
f1<<"C++Programming";
f1.close( );
ifstream f2("DATA.TXT");
if(f2.good( ))f2>>s;
f2.close( );
cout<<s;
return 0;
}
执行上面的程序将输出______。
[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
[填空题]有以下程序:
#include <iostream>
#include <fstream>
using namespace std;
int main( )
{
fstream file;
file.open("abc.txt", ios_base::in);
if (! file )
{
cout<<"Can not open abc.txt"<<end1;
abort( );
}
char ch;
int i = 0;
while ( ! file.eof( ) )
{
file.get(ch);
i++;
}
cout<<"Characters : "<<i<<end1;
file.close( );
return 0;
}
程序实现的功能是 【15】 。
[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<iostream>
#include<string>
using namespace std;
int main( )
char arr[2][4];
strcpy(arr[0],"you");
strcpy(arr[1],"me");
arr[0][3]='&';
cout<<arr[0]<<end1;
return 0;
执行后的输出结果是( )。
A. you&me
B. you
C. me
D. err
[单项选择]有如下程序
#include <iostream>
#include <iomanip>
using namespace std;
int main( )
cout<<setprecision(3)<<fixed<<setfill('*')<<setw(8);
cout<<12.345<<______34.567;
return 0;
若程序的输出是:
**12.345**34.567
则程序中下划线处遗漏的操作符是( )。
[单项选择]有如下程序
#include <iostream>
#include <iomanip>
using namespace std;
class MyClass
public:
MyClass( ) cout<<’A’;
MyClass(char c) cout<<c;
~MyClass( ) cout<<’B’;
;
int main( )
MyClass p1,*p2;
p2=new MyClass(’X’);
delete p2;
return 0;执行这个程序屏幕上将显示输出( )。
A. ABX
B. ABXB
C. AXB
D. AXBB
[填空题]有以下程序:
#include <iostream>
#include <fstream>
using namespace std;
int main( )
ofstream ofile("D://test.txt");
if(!ofile)
cout<<"test.txt can’t open"<<end1;
return 0;
ofile<<"This book is C++"<<" "<<12345<<end1;
ofile.close( );
ifstream ifile("D://test.txt");
if ( ! ifile)
cout<<"test.txt can’t open"<<end1;
return 0;
char str[80];
ifile>>str;
ifile.close( );
cout<<str<<end1;
return 1;
程序执行后的输出结果是 【15】 。