更多"有以下程序 #include <iostream> #includ"的相关试题:
[单项选择]有以下程序: #include <iostream> #include <cmath> using namespace std; class Distance; class point { public: friend class Distance; Point(int a,int B) { x=a; Y=b; } void Print( ) { cout<<"X= "<<X<<end1; cout<<"Y= "<<Y<<end1; } private: float X,Y; }; class Distance { public: float Dis(Point &p,Point &q); }; float Distance :: Dis(Point &p,Point &q) { float result; result=sqrt((p.X-q.X)*(p.X-q.X)+(p.Y-q.Y)*(p.Y-q.Y)); cout<<result<<end1; retUrn result; } int main( ) { Point p(10,10),q(10,30); Distance d; d.Dis(p,q); return 0; } 运行后的输出结果是( )。
A. 10
B. 30
C. 0
D. 20
[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; 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]有以下程序:
#include 〈iostream〉
#include 〈string〉
using namespace std;
class visited
private:
int number;
char *name;
public:
static int glob;
void set mes(char *
[单项选择]下面程序中对一维坐标点类Point进行运算符重载
#include <iostream>
using namespace std;
class Point f
public:
Point(int val) x=val;
Point& operator++( ) x++; return *this;
Point operator++(int) Point old=*this;++(*this);return old;
int GetX( ) const return x;
private:
int x;
;
int main( )
Point a(10);
cout<<(++a).GetX( );
cout<<a++.GetX( );
return 0;
编译和运行情况是( )。
A. 运行时输出1011
B. 运行时输出1111
C. 运行时输出1112
D. 编译有错
[单项选择]应在下面程序下划线中填写的正确的语句是( )。
#include <iostream>
using namespace std;
class A
public:
void test( )cout<< "this is A!";
;
class B:public A
void test( )
______ //显示调用基类函数test( )
cout<< "this is B!";
;
void main( )
A. A) :test()
B. C) :test()