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ides

unread,
Mar 9, 1999, 3:00:00 AM3/9/99
to
//cx0536.cpp//
#include<iostream.h>

class pointer {
int x, y;
public:
void swap(int *px, int *py)
{ int temp=*px;
*px=*py;
*py=temp;
}
friend void disp(int &fx, int &fy);
};//pointer

class reference {
int x, y;
public:
void swap(int &x, int &y)
{ int temp=x;
x=y;
y=temp;
}
friend void disp(int &fx, int &fy);
};//reference

void disp(int &fx, int &fy)
{ cout<< fx <<","<< fy; }

void main()
{
pointer a;
reference b;
int x=11, y=19, xx=1, yy=9;
a.swap(&xx,&yy);
b.swap(&x,&y);
disp(a.x, a.y);
disp(b.x, b.y);
}//mian

天哪！怎麼物件導向的程式這麼難啊！
連這麼簡單的程式我都寫不出來！
可不可以教教我啊！我實在是看不出來到底哪裏錯了！
才幾行程式碼花了我二個小時，還看不出來到底哪裏錯了。


Compiling ..\..\13CPP\CPP\0536.CPP:
Warning ..\..\13CPP\CPP\0536.CPP 38: Temporary used for parameter 'x' in
call to 'reference::swap(int &,int &)'
Error ..\..\13CPP\CPP\0536.CPP 38: Cannot convert 'int *' to 'int'
Error ..\..\13CPP\CPP\0536.CPP 38: Type mismatch in parameter 'x' in call to
'reference::swap(int &,int &)'
Warning ..\..\13CPP\CPP\0536.CPP 38: Temporary used for parameter 'y' in
call to 'reference::swap(int &,int &)'
Error ..\..\13CPP\CPP\0536.CPP 38: Cannot convert 'int *' to 'int'
Error ..\..\13CPP\CPP\0536.CPP 38: Type mismatch in parameter 'y' in call to
'reference::swap(int &,int &)'
Error ..\..\13CPP\CPP\0536.CPP 39: 'pointer::x' is not accessible
Error ..\..\13CPP\CPP\0536.CPP 39: 'pointer::y' is not accessible
Error ..\..\13CPP\CPP\0536.CPP 40: 'reference::x' is not accessible
Error ..\..\13CPP\CPP\0536.CPP 40: 'reference::y' is not accessible
Warning ..\..\13CPP\CPP\0536.CPP 41: 'y' is assigned a value that is never
used
Warning ..\..\13CPP\CPP\0536.CPP 41: 'x' is assigned a value that is never
used


我是可愛的C++

unread,
Mar 9, 1999, 3:00:00 AM3/9/99
to
※ 引述《"ides" <id...@pagans.org>, 看板: oop》之銘言：
: //cx0536.cpp//

: #include<iostream.h>
: class pointer {
: int x, y;
: public:
: void swap(int *px, int *py)
: { int temp=*px;
: *px=*py;
: *py=temp;
: }
: friend void disp(int &fx, int &fy);
: };//pointer
: class reference {
: int x, y;
: public:
: void swap(int &x, int &y)
: { int temp=x;//88888888888888888-注意這裡-8888888888
: x=y;
: y=temp;//88888888888888888888-還有這裡-88888888888
: }
: friend void disp(int &fx, int &fy);

請看我前面幫你標示起來的地方:

你怎麼可以將一個 指標( x ) 傳給 一個整數變數( temp )呢
(相反也不行............)

還有 你的reference class 有 x,y 兩個變數成員,
你的swap函式怎麼又宣告成:
swap(int &x,int &y)
x,y 有重複了嘛.............

--
>>>>my name is oel larrel<<<<<
想清算我,討伐我,鬥垮我的人,請email oel
謝謝

--
※ Origin: 程式設計樂園 ◆ From: tp220-4.dialup.seed.net.tw

ides

unread,
Mar 9, 1999, 3:00:00 AM3/9/99
to
//cx0536.cpp//
#include<iostream.h>

class pointer {
int x, y;
public:

pointer(int p_x, int p_y)
{ x=p_x; y=p_y; }


void swap(int *px, int *py)
{ int temp=*px;
*px=*py;
*py=temp;
}

friend void disp(int fx, int fy);
};//pointer

class reference {
int x, y;
public:

reference(int r_x, int r_y)
{ x=r_x; y=r_y; }
void swap(int &rx, int &ry)
{ int temp=rx;
rx=ry; ry=temp;
}
friend void disp(int fx, int fy);
};//reference

void disp(int fx, int fy)
{ cout<<fx<<","<<fy; }

void main()
{


int x=11, y=19, xx=1, yy=9;

pointer a(xx, yy);
reference b(x, y);
a.swap(&xx,&yy);
b.swap(x,y);
disp(a.x, a.y);//這裏錯了
disp(b.x, b.y);//還有這裏
}//mian
謝謝你，經過我一番修改了之後，變成這樣，可是還是有錯.
不是說，朋友函數，可以取用類別的成員嗎？為什麼這裏不行？

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