更多"下面程序有注释的语句中,错误的语句是( )。 #include <"的相关试题:
[单项选择]下面程序有注释的语句中,错误的语句是( )。
#include <iostream>
using namespace std;
class A
int a;
public:
void show A( )cout<<"this is A!";
;
class B:public A
int b;
public:
void show B( )cout<< "this is B!";
;
void main( )
A ia,*piA;
B ib,*piB;
piA=ia; //第一个测试语句
piA=&ib; //第二个测试语句
piA->showA( ); //第三个测试语句
piA->showB( ); //第四个测试语句
A. 第一个测试语句
B. 第二个测试语句
C. 第三个测试语句
D. 第四个测试语句
[单项选择]应在下列程序画线处填入的正确语句是 ( )。
#include <iostream>
using namespace std;
clas Base
public:
void fun( )
cout<<"Base::fun"<<end1;
;
class Derived : public Base
void fun( )
________________//显示调用基类的函数 fun( )
cout<<"Derived::fun"<<end1;
;
A. fun();
B. Base.fun(); C) Base::fun(); D) Base->fun();
[单项选择]有以下程序:
#include <iostream>
#include <math>
using namespace std;
class point
private:
double x;
double y;
public:
point(double a,double b)
x=a;
y=b;
friend double distance(point a,point b) ;
;
double distance(point a,point b)
return sqrt ((a.x-b.x)* (a.x-b.x)+(a.y-b.y)*(a.y-b.y));
int main ( )
point pl(1,2);
point p2 (5, 2);
cout<<distance (pl,p2) <<end1;
return 0;
程序运行后的输出结果是()
A. 1
B. 5
C. 4
D. 6
[单项选择]下面程序错误的语句是
①#include < iostream.h>
②void main( 0
③
④ int * p = new int[1] ;
⑤ p =9;
⑥ cout <<*p <<end1;
⑦ delete [ ] p;
⑧
A. ④
B. ⑤
C. ⑥
D. ⑦
[填空题]下面程序的执行结果是 【15】
#include <iostream>
#include <iomanip>
using namespace std;
void main( )
{
cout<<setfill(’x’)<<setw(10);
cout<<"Hello"<<end1;
}
[填空题]下面程序的执行结果是 【15】 。
#include <iostream>
#include <iomanip>
using namespace std;
void main( )
cout<<setfill(’x’)<<setw(10);
cout<<"Hello"<<end1;
[填空题]下面程序的执行结果是 【15】
#include <iostream>
#include <iomanip>
using namespace std;
void main( )cout<<setfill(’x’)<<setw(10);
cout<<"Hello"<<end1;
[单项选择]下面程序的输出结果是( )。 #include<iostream> #include<string> using namespace std; void main( ){ charp1[10],p2[10]; strcpy(p1,"abc"); strcpy(p2,"ABC"); charstr[50]="xyz"; strcpy(str+2,strcat(p1,p2)); cout<<str; }
A. xyabcABC
B. yzabcABC
C. xyzabcABC
D. zabcABC
[单项选择]下面程序的输出结果是( )。
#include<iostream>
#include <math.h>
using namespace std;
class point
private:
double x;
double y;
public:
point(double a, double b)
x=a;
y=b;
friend double distances(point a,point b);
;
double distances(point a,point b)
return sqrt((a.x-b.x)*(a.x-b.x)+(a.y-b.y)*(a.y-b.y));
int main( )
point p1 (1,2);
point p2(5,2);
cout<<distances(p1 ,p2)<<end1;
return 0;
A. 2
B. 4
C. 8
D. 16
[单项选择]下面程序的输出结果是
#include<iostream.h>
#include<string.h>
void main( )
char p1[10],p2[10]
strcpy(p1,"abc");
strcpy(p2,"ABC");
char str[50]="xyz";
strcpy(str+2,strcat(p1,p2));
cout<<str;
A. xyzabcABC
B. zabcABC
C. xyabcABC
D. yzabcABC
[单项选择]下面程序的输出结果是( )。
#include <iostream.h>
#include "string.h"
void main( )
char a[]="welcome",b[]="well";
strcpy(a,b);
cout<<a<<endl;
A. wellome
B. well com
C. well
D. well we
[单项选择]下面程序的输出结果是( )。
#include<iostream.h>
#include"string.h"
void main( )
char a[]="Hello Test",b[]="Test";
strcpy(a,b);
cout<<a<<end1;
A. Hello
B. Test
C. Hello Test
D. Hello Test HelloTest
[填空题]将下面程序补充完整。
#include <iostream>
using namespace std;
class Base
public:
【14】 fun( )return 0; //声明虚函数
;
class Derived:public Base
public:
x,y;
void SetVal(int a,int b)
int fun( )return x+y;
;
void 【15】 SetVal(int a,int b)x=a;y=b; //类Derived成员函数
void main( )
Derived d;
cout<<d.fun( )<<endl;
[单项选择]下面程序的执行结果为 ‘ #include"iostream" using namespace std; class A { int a; public: void Sera(int x){a=x;} void Display_a( ){cout<<a<<endl;} }; class B { int b; public: void Setb(int x){ b=x;} void Dispaly_b( ) {cout<<b<<endl;} }; class C://public A,private B { private: int c; public: void Setc(int x,int y,int z) { c=z;Sera(x);Serb(y);} void Display_c( ){cout<<c<<endl;} }; ① void main( ) ② { ③ C cc; ④ cc.Seta(1); ⑤ cc.Display_a( ); ⑥ cc.Setc(2,2,3); ⑦ cc.Dispaly_b( ); ⑧ cc.Display_c( ); }
A. 输出为2 2 3
B. 有错误在第5行
C. 输出为1 2 3
D. 有错误在第7行
[单项选择]下面程序的结果是
#include<iostream.h>
class A
public:
A( ) cout < < "construtA" < < end1;
virtual ~A( ) cout < < "destructA" < < end1; ;
class B:public A
;
class C://public A
;
class D://public B,public C
;
void main( )
Dd;
A. constructA
B. constructA
C. constructA
D. constructA
[单项选择]下面程序的结果是 #include<iostream.h> class A { int a; public: A( ):a(1){ } void showa( ){ cout < < a;} }; class B { int a; public: B( ):a(2){ } void showa( ) { cout < < a;} }; class C://public A,public B { int a; public: C( ):a(3) { } void showa( ) {cout < < a;} }; void main( ) { C c; c.showa( ); }
A. 1
B. 2
C. 3
D. 程序有错误