更多"有如下程序: #include <iostream> usin"的相关试题:
[单项选择]
有如下程序:
#include
#include
using std::cout;
class Point{
public:
friend double distance(const Point &p); //p距原点的距离
Point(int xx=0,int yy=0):x (xx),Y(YY){}//①
private:
Int x,Y;
};
double distance(const Point &p) { //②
return sqrt(p.x*p.x+p.Y*p.Y);
}
int main(){
Point p1(3,4);
cout< return 0;
}
下列叙述中正确的是()
A. 程序编译正确
B. 程序编译时语句①出错
C. 程序编译时语句②出错
D. 程序编译时语句③出错
[单项选择]以下程序执行后的输出结果是
#include<iostream>
using namcspace std;
void try(int,int,int,int);
int main( )
int x,y,z,r;
x=1;
y=2;
try(x,y,z,r);
cout<<r<<end1;
return 0;
void try(int x,int y, int z,int r)
z = x+y;
x = x*x;
y = y*y;
r = z+x+y;
A. 18
B. 9
C. 10
D. 不确定
[单项选择]有如下程序:
#include
#include
using namespace std;
class MyString{
public;
char str[80];
MyString(const char*s) {strcpy(str,s);}
MyString&operator+=(MyString a){
strcat(str,a.str);
return*this;
}
};
ostream&operator<<(ostream&s,const MyString&z){return s << z.str}
int main( ){
MyString x("abc"),y("cde");
cout<<(x+=y)<A. abc
B. cde
C. abcde
D. abccde
[简答题]有如下程序
#include
#include
using namespace std;
class MyClass{
public:
MyClass( ){cout<<’A”;}
MyClass(char c {cout<A. A.ABX
B.ABXB
C.AXB
D.AXBB
[单项选择]有如下程序
#include
using namespace std;
class Base{
protected:
Base( ){cout<<′A′;}
Base(char C){cout<A. B
B. BA
C. AB
D. BB
[单项选择]有如下程序
#include
using namespace std;
class Sample
{
friend long fun(Sample s);
public:
Sample(10ng a){x:a;}
{
prtvate:
10ng x;
);
long fun(Sample s) if (s.x<2) return 1
return s,x *fun(Sample(s,x-1);
}
int main( )
{
int sum=0;
for(int i=0,i<6;i++){sum+:fun(Sample(i));)
Cout<A. 120
B. 16
C. 154
D. 34