更多"有以下程序: #include <iostream> #inc"的相关试题:
[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 <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】 。
[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:
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 <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]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 <fstream> using namespace std; int main ( ) { ofstream ofile; char ch; ofile.open ("abc.txt"); cin>>ch; while (ch!=’#’ ) { cin>>ch; ofile.put(ch); } ofile.close( ); return 0; } 当从键盘终端连续输入的字符为a、b、c和#时,文件abc.txt中的内容为( )。
A. 程序编译时出错
B. abc#
C. abc
D. #
[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 p1(1,2); point p2(5,2); cout<<distance(p1,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]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 *