更多"下列程序中,划线处正确的语句是( )。 #include<io"的相关试题:
[单项选择]下列程序中划线处正确的语句是( )。
# include <iostream>
using namespace std;
class Base
public:
void fun( )cout<<"Base:: fun" <<endl;
;
class Derived:public Base
void fun( )
______ ∥显式调用基类的函数fun( )
cout<<"Derived:: fun"<<endl;
;
A. fun();
B. Base.fun();
C. Base::fun();
D. Base- >fun();
[单项选择]下列程序中,划线处正确的语句是( )。
#include<iostream.h>
Class Base
Public:
Void fun( )cout<<"Base::fun"<<endl;
;
Class Derived:public Base
void fun( )
______ //显示调用基类的函数fun( )
Cout<<"Derived::fun"<<endl;
;
A. fun()
B. Base.fun()
C. Base::fun()
D. Base->fun();
[填空题]下列程序编译错误,是由于划线处缺少某个语句,该语句是 【15】 。
#include <iostream. h>
class A
{
______
private:
int numl;
public:
A( ):numl(0){}
A(int i):numl(i){}
};
class B
{
private:
int num2
public:
B( ):num2(0){}
B(int i):num2(i){}
int my_math(A obj1,B obj2);
};
int B::my_math(A obj1,B obj2)
}
return (obj1.num1+obj2.num2);
}
void main(void)
{
A obj1 (4)
B obj,obi2(5);
cout <<"obj1+obj2:"<<obj.my_math(obj1,obj2);
}
[单项选择]为完成下面的程序,应在划线处填入的语句是
#include<iostream>
using namespace std;
class Base
private:
int x;
public:
Base (int i)
x=i;
~Base( )
;
class Derived:public Base
public:
______________//完成类Derive构造函数的定义
;
int main( )
Derived Obj;
return 0;
A. Derived(inti):Base(i)
B. Derived()
C. void Derived (inti):Base(i)
D. Derived(inti)Base(i);
[填空题]下列程序编译错误,是由于划线处缺少某个语句,该语句是______。
#include<iostream.h>
class A
private:
int numl;
public:
A( ):numl(0)
A(int i):numl(i)
;
class B
private:
int num2;
public:
B( ):num2(0)
B(int i):num2(i)
int my_math(A obj1, B obj2);
;
int B::my_math(A obj1,B obj2)
return(obj1.numl+obj2.num2);
void main(void)
A objl(4);
B obj,obj2(5);
cout<<"obj1+obj2:"<<obj.my_math(obj1,obj2);
[填空题]下列程序中需要清理动态分配的数组,划线处应有的语句是 【13】 。
#include<iostream, h>
class person int age, tall;
public:
person( ) age= 0; tall= 40; cout<<"A baby is born. "<<end1;
person(int i) age=i, tall=40, cout<<"A old person. "<<end1;
person(int i, int i) age = i; tall = j; cout <<" a old person with tall. "<<
end1;
~person( ) cout<<" person dead. "<<end 1;
void show( )
cout<<"age= "<<age<<" ,tall= "<<tall<<end1;
;
void main( ) person * ptr;
ptr = new person[3];
ptr[0]=person ( )
ptr[1]=person(18);
ptr[2]=person(20,120);
for(int i=0;i<3; i++)
ptr[i]. show( );
______
[填空题]下列程序对加号进行了重载,划线部分的语句是 【15】 。
# include<iostream. h>
# include<math. h>
class Triangle
int x,y,z;
double area;
public:
Triangle(int i,int j, int k)
double s;
x=i;y=j;z=k;
s=(x+y+z)/2.0;
area=sqrt(s*(s-x)*(s-y)*(s-z));
void disparea( )
cout<<"Area="<<area<<endl;
friend double operator+(Triangle t1,Triangle t2)
______
;
void main( )
Triangle t1(3,4,5),t2(5,12,13);
double s;
cout<<"t1:";t1.disparea( )
cout<<"t2:";t2.disparea( )
s=t1+t2;
tout<<"总面积:="<<s<<endl;
[单项选择]下列选项中,对划线语句解释最准确的一项是:
A. 谴责撒谎者的依据是内心对是非、善恶的正确认识
B. 撒谎者自我谴责来自于他大脑中的前扣带回区域
C. 善良的心地是谴责撒谎者的依据
D. 撒谎者的自我谴责源于他大脑中“自我控制”区域的干预
[填空题]下列程序对加号进行了重载,划线部分的语句是______。
#include<iostream.h>
#include<math.h>
class Triangle
{
int x,y,z;
double area;
public:
Triangle(int i,int j,int k)
{
double s;
x=i;y=j;z=k;
s=(x+y+z)/2.0;
area=sqrt(s*(s-x)*(s-y)*(s-z));
}
void disparea( )
{
cout<<"Area="<<area<<endl;
}
friend double operator+(Triangle tl,Triangle t2)
{
______
}
};
void main( )
{
Triangle tl(3,4,5),t2(5,12,13);
double s;
cout<<"tl:";t1. disparea( );
cout<<"t2:";t2. disparea( );
s=t1+t2:
cout<<"总面积:="<<s<<endl;
}
[填空题]下列程序不能通过编译,应该在划线部分填写的语句是 【9】 。
#include<iostream. h>
#include<stdlib. h>
double Fune(int a, int b, char ch) double x;
switch(ch)
case ’+’:
x=double(a) +b;
break;
case ’--’:
x= double(a) --b;
break;
case ’/’:
x=double(a) * b;
break;
case ’/’:
if(B) x=double(a) /b;
else
exit(1)
break
default:
exit(1);
______
void main( )
cout<<Func(32 , 6 ,’--’)<< ",";
cout<<Func(32, 6 ,’*’) <<",";
cout<<Func(32, 6 ,’/’) <<end1;
[填空题]下列程序不能通过编译,应该在划线部分填写的语句是______。
#include<iostream.h>
#include<stdlib.h>
double Func(int a,int b,char ch)
{
double x;
switch(ch)
{
case’+’:
x=double(a)+b;
break;
case ’-’:
x=double(a)-b;
break;
case ’*’:
x=double(a)*b;
break;
case’/’:
if(B)x=double(a)/b;
else
exit(1);
break;
default:
exit(1);
}
______
}
void main( )
{
cout<<Func(32,6,’-’)<<",";
cout<<Func(32,6, ’*’)<<",";
cout<<Func(32,6,’/’)<<endl;
}
[填空题]请在下列程序中的横线处填写正确的语句。
#include<iostream>
using namespace std;
class Base{
public:
void fun( ){cout<<“Basefun”<<endl;}
);
class Derivde:public Base{
public:
void fun( ){
//调用基类的函数fun( )
cout<<“Derived fun”<<endl;
}
};
[填空题]请在如下程序中的空格处填写正确的语句;
#include<iostream>
using namespaee std;
c]ass Base
public:
void fun( )cout<<"Base fun"<<endl;
;
class Derived:public Base
public:
void fun( )
______//调用基类的函数fun( )
cout<<"Derived fun"<<endl;
;
[填空题]请在下列程序中的横线处填写正确的语句。
#include<iostream>
using namespace std;
class Base
public:
void fun( )cout<<"Base fun"<<endl;
;
class Derivde:public Base
public:
void fun( )
______//调用基类的函数fun( )
cout<<"Derived fun"<<endl;
;