更多"下面程序的输出结果是( )。 #include<iostream>"的相关试题:
[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]下面程序输出的结果是( )。
#include<iostream>
using namespace std;
int fuc (char *x);
int main( )
cout<<fuc("hello")<<endl;
return 0;
int fuc(char *x)
char *y=x;
while(*y! =’/0’)y++;
return(y-x);
A. 5
B. 6
C. 0
D. 语法错误,不能输出结果
[单项选择]下面程序输出的结果是
#include<iostream.h>
void main( )
inti;
int a[3] [3] =1,2,3,4,5,6,7,8,91;
for(i=0;i<3;i++)
cout < < a[2-i] [i] < < " "; A) 1 5 9 B) 7 5 3 C) 3 5 7 D) 5 9 1
[填空题]下面程序输出的结果是 【11】 。
#include <iostream>
using namespacc std;
class A {
public:
void show( ){tout<<"A!";}
};
class B: public A{
public:
virtual void show( ){cout<<"B!";}
};
class C: public B{
public:
virtual void show( ){cout<<"C!";}
};
void show_info(A *i){i->show( );}
void main( ){
A ia;B ib;C ic;show_info(&ia); show_info(&ib);show_info(&ic);
}
[填空题]下面程序输出的结果是 【10】 。
#include <iostream>
using namespace std;
class A {
public:
virtual void show( ) {cout<<"A!";
};
class B: public A {
public:
void show( ) {cout << "B!";}
};
class C: public B{
public:
void show( ){cout << "C!";}
};
void show_info(A &i) {i. show( );}
void main( ) {
A ia; B ib; C ic; show_info(ia);show_info(ib); show_info(ic); }
[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.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>
class example
int a;
public:
example(int b) a=b++;
void print( )a=a+1;cout<<a<<"";
void print( )constcout<<a<<"";
;
void main( )
example X(3);
const example y(2);
x.print( );
y.print( );
A. 22
B. 43
C. 42
D. 32
[填空题]下面程序的输出结果是 【15】 。
#include <iostream.h>
#include <math.h>
class point
{
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) );
}
void main( )
{
point p1(1,2);
point p2(5,2);
cout<<distance(p1,p2)<<end1;
}
[单项选择]下面的程序输出结果是( )。
#include<iostream>
using namespace std;
void add( )
static int x;
x++;
cout<<x<<’’;
int main( )
for(int i=0;i<3;i++)
add( );
return 0;
A. 111
B. 123
C. 222
D. 333
[填空题]下面程序的输出结果是______。
#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)<<endl;
return 0;