更多"下面程序运行的结果是( )。 #include<iostream>"的相关试题:
[单项选择]下面程序运行的结果是( )。 #include<iostream> using namespace std; class A{ protected: int a; public: void input(int i) {a=i;} }; class B{ protected: int a; public: void input(int j) {a=j;} }; class C: public A, public B { int x; public: void input( ) {x=A::a * B::a;cout<<x<<endl;} }; void main( ) { C c; c.A::input(5); c.B::input(8); c.input( ); }
A. 5
B. 8
C. 40
D. 编译出错
[单项选择]下面程序的运行结果是( )。
#include<iostream>
using namespace std;
class TestClass
static int n;
public:
TestClass ( )
n++;
static int test( )
for(int i=0;i<4;i++)
n++;
return n;
;
int TestClass::n=0;
int main( )
cout<<TestClass::test( )<<" ";
TestClass c1,c2;
cout<<TestClass::test( )<<endl;
return ( );
A. 4,10
B. 4,6
C. 0,6
D. 0,4
[单项选择]如下程序运行时的输出结果是
#include<iostream>
using namespace std;
class ONE
int c;
public:
ONE( ):c(0)eout<<1;
ONE(int n):C(n)cout<<2;
;
class TW0
ONE onel;
ONE one2;
public:
TWO(int m):one2(m)eout<<3;
;
int main( )
TWO t(4);
return 0;
A. 3
B. 23
C. 123
D. 213
[单项选择]下面程序的输出结果是( )。
#include<iostream>
Using namespace std:
Class Base
public:
Base(int x=0)count<<x;
;
Class Derived:public Base
public:Derved(int x=0count<<x;
private:
Base val;
;
int mina( )
Derived d(1);
return 0;
A. 0
B. 1
C. 01
D. 001
[单项选择]下面程序的执行结果是( )。
#include<iostream>
using namespace std;
class building
public:
building( )
building(unsigned stories, float breadths, float lengths)
story = stories; breadth = breadths; length = lengths;
void getstory(void)
cout<<"story is:"<<story<<endl;
void getarea(void)
area = length*breadth*story;cout<<"area is:"<<area<<endl;
private:
unsigned story;
float length;
float breadth;
float area;
;
void main(void)
building b1,b2;building b3(10u,16.6,58.8);
b1.getstory( );
b1.getarea( );
b2.getstory( );
b2.getarea( );
b3.getstory( );
b3.getarea( );
A. story is:0
B. story is:null
C. 前两个对象输出的结果是不定的,后一个对象的结果正确
D. 前两个对象没有初值,因此程序编译时出错
[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]下面程序的运算结果是( )。
#include<iostream>
using namespace std;
class A
public:
virtual void fun( )=0;
;
class B:public A
public:
void fun( )
cout<<"new file"<<" ";
;
class C:public A
public:
void fun( )
cout<<"open file"<<" ";
;
void main( )
A a, * p;
B b;C c;
p=&c;
p->fun( );
p=&b;
A. new file open file
B. new file new file
C. 编译出错
D. open file new file
[单项选择]下面程序的输出结果是( )。 #include<iostream> using namespace std; template<class T> T max(T x,T y) { return(x>= y x:y);} template<class T> T max(T x,T y,T z) { T t; t=(x>=y x:y); return(t>=z t:z); } void main( ){ int x = 10,y=18,maxi; float a = 1.2,b = 3.2,c = 2,max2; max1 = max(x,(int)c); max2 = max(a,b,(float)y); cout<<maxi<<endl; cout<<max2<<endl; }
A. 18 3.2
B. 10 18
C. 10 3.2
D. 编译出错