帮小女子看看这简单的C++错在哪里？ - 编程论坛

#2

avator1232011-10-12 21:34

回复楼主 avator123

程序代码：

#include <iostream>
using namespace std;

class Point {

   int x , y ;

    public :

    void set (int a ,int b) {   x = a ,y = b ; }

    friend  operator+(const Point& d ) ;


    friend ostream& operator<<(ostream& o, const Point& d) ;

} ;

operator+(const Point &d )

{


    Point s ;
    s.set (x+d.x,y+d.y);
    return s ;


    }

ostream& operator<<(ostream& o, const Point& d)  {

return o<<"("<<d.x<<", "<<d.y<<")\n"  ;

}

void main()
{

Point s,t ;

s.set(2,5);

t.set(3,1);

operator+(s,t);
// cout<<s+t ;
}

#3

czsbc2011-10-12 21:35

程序代码：

#include <iostream>

using namespace std;

class Point;

Point operator+(const Point &e,const Point &d );
ostream& operator<<(ostream& o, const Point& d);

class Point {

    int x , y ;

    public :
    void set (int a ,int b) {   x = a ,y = b ;}

    friend Point operator+(const Point &e,const Point &d  ) ;

    friend ostream& operator<<(ostream& o, const Point& d) ;
} ;

Point operator+(const Point &e,const Point &d )
{

    Point s ;
    s.set (e.x+d.x,e.y+d.y);
    return s ;

    }

ostream& operator<<(ostream& o, const Point& d)  {

return o<<"("<<d.x<<", "<<d.y<<")\n"  ;

}

void main()
{
Point s,t ;
s.set(2,5);
t.set(3,1);
operator+(s,t);

}

#4

avator1232011-10-12 21:35

--------------------Configuration: training - Win32 Debug--------------------
Compiling...
training.cpp
D:\Program Files\Microsoft Visual Studio\MyProjects\myproject\training.cpp(11) : fatal error C1001: INTERNAL COMPILER ERROR
        (compiler file 'msc1.cpp', line 1786)
         Please choose the Technical Support command on the Visual C++
         Help menu, or open the Technical Support help file for more information
执行 cl.exe 时出错.

training.obj - 1 error(s), 0 warning(s)

#5

avator1232011-10-12 21:38

czsbc，谢谢了，果然是高手

#6

czsbc2011-10-12 21:40

程序代码：

#include <iostream>
using namespace std;

class Point;
ostream& operator<<(ostream& o, const Point& d);

class Point {

    int x , y ;

    public :

    void set (int a ,int b) {   x = a ,y = b ; }

    Point operator+(const Point& d ) ;


    friend ostream& operator<<(ostream& o, const Point& d) ;

} ;

Point Point::operator+(const Point &d )
{

    Point s ;
    s.set (x+d.x,y+d.y);
    return s ;

    }

ostream& operator<<(ostream& o, const Point& d)  {

return o<<"("<<d.x<<", "<<d.y<<")\n"  ;

}

void main()
{
Point s,t ;
s.set(2,5);
t.set(3,1);
cout<<s+t ;
}

#7

avator1232011-10-12 21:47

回复 6楼 czsbc

#include <iostream>
using namespace std;

class Point; //why add this declaration to here? could you please explanation to me clearly ?
ostream& operator<<(ostream& o, const Point& d);//why add this declaration to here?

class Point {

    int x , y ;

    public :

    void set (int a ,int b) {   x = a ,y = b ; }

    Point operator+(const Point& d ) ;

    friend ostream& operator<<(ostream& o, const Point& d) ;

} ;

Point Point::operator+(const Point &d )
{

    Point s ;
    s.set (x+d.x,y+d.y);
    return s ;

    }

ostream& operator<<(ostream& o, const Point& d)  {

return o<<"("<<d.x<<", "<<d.y<<")\n"  ;

}

void main()
{
Point s,t ;
s.set(2,5);
t.set(3,1);
cout<<s+t ;
}

#8

czsbc2011-10-12 22:15

这个问题与编译器有关，在VC6中要先声明，
在VS2010中，支持标准C++的就不用了。