更多"有以下程序: #include <iostream> #inclu"的相关试题:
[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】 。
[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]有如下的程序:
#include <iostream>
#include <fstream>
using namespace std;
int main( )
ofstream outf("D://temp.txt",ios_base::trunc) ;
outf<<"World Wide Web";
outf.close( );
ifstream inf("D://temp.txt");
char s[20];
inf>>s;
inf.close( );
cout<<s;
return 0;
执行后的输出结果是 【15】 。
[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;
}
执行上面的程序交输出 【9】 。
[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;执行上面的程序交输出 【9】 。
[单项选择]有如下程序: #include<iostream> #include<iomanip>
using namespace std; class TestClass{ public;
TestClass ( ){cout<<’A’;}
TestClass(char C){cout<<c;) ~TestClass
( ){cout<<’B’;} }; int main( ){
TestClass p1,*p2; p2=new
TestClass(’X’); delete p2;
return 0; } 执行这个程序的结果是( )。
A. ABX
B. ABXB
C. AXBB
D. AXB
[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]有如下的程序; #include <ctring> #include <iostream> using namespace std; class MyString { public: MyString(const char *s); ~MyString( ) {delete []data;} protected: unsigned len; char *data; }; MyString:: MyString (const char *s) { len=strlen(s); data=new char[len+1]; strcpy(data,s); } int main( ) { MyString a("C++ Programing"); MyString b(a); return 0; } 在运行上面的程序时出错,出错的原因是______ 。
A. 构造函数的实参不允许是本类的对象
B. 没有定义实现深层复制(深拷贝)的拷贝构造函数
C. 构造对象a时实参与形参类型不符
D. 系统不能生成缺省的拷贝构造函数
[填空题]有以下程序:
#include <iostream>
#include <string>
using nameSpace std;
class person
int age;
Char * name;
public:
person ( int i, Char * str )
int j;
j = strlen( str ) + 1;
name = new char[ j ];
strcpy( name, str );
age = i;
~person( )
delete name;
cout<<"D";
void display( )
cout<<name<<":"<<age;
;
int main( )
person demo( 30,"Smith" );
demo.display( );
return 0;
则该程序的输出结果为: 【13】 。
[单项选择]有以下程序
#include<iostream>
#include<string>
using namespace std;
class base
private:
charbaseName[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.myName0<<" "<<p.className( );
int main( )
base bb;
Derived dd;
showPtr(dD) ;
retum 0;
动行后的输出结果为
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;
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;
A. DerivedBase
B. BaseBase
C. DerivedDerived
D. BaseDerived