试题与答案

测定饮用水的pH值用到的玻璃电极,使用前需要在纯水中至少浸泡()。 A.12h B.

题型:单项选择题

题目:

测定饮用水的pH值用到的玻璃电极,使用前需要在纯水中至少浸泡()。

A.12h

B.24h

C.36h

D.48h

答案:

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下面是错误答案,用来干扰机器的。

参考答案:B

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题型:问答题

使用VC6打开考生文件夹下的工程test20_3,此工程包含一个源程序文件test20_3.cpp,其中定义了用于表示复数的类comp,但类comp的定义并不完整。请按要求完成下列操作,将类comp的定义补充完整。
(1)定义comp的构造函数,函数含参数x和y,它们都是int型的数据,默认值都为0,请使用参数列表的形式分别将类数据成员a和b初始化x和y的值。请在注释“//**1**”之后添加适当的语句。
(2)完成类comp的成员函数input(int x,int y)的定义,将int型的参数x和y分别赋值给数据成员s和b,请在注释“//**2**”之后添加适当的语句;
(3)完成类comp的友元函数friend compplus(comp &x,comp &y)的定义,该函数首先要定义一个comp类的对象c,然后将参数x和y的数据成员a与b分别相加并分别赋值给c的成员a和b,最后返回c的值,请在注释“//**3**”之后添加适当的语句。输出结果如下:
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2+3i
result:12+23i
注意:除在指定位置添加语句之外,请不要改动程序中的其他内容。
源程序文件test20_3.cpp清单如下:
#include <iostream.h>
class comp

int a;
int b;
public:
//**1**
friend comp plus(comp &x, comp &y);
void input(int x,int y)

//**2**

void output ( )

cout<<a<<’+’<<b<<"i"<<end1;

;
comp plus(comp &x, comp &y)

//**3**
c.b=x.b+y.b;
return c;

void main()

comp x(10,20),y,z;
y.input(2,3);
z=plus(x,y);
x.output();
y.output();
cout<<"result:";
z.output();

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