小程序,有处错误!不知怎么改!

[chenhuach]

#include<iostream>
#include<math>
using namespace std;
class line2;
class line1
{
private:
float a,b,c,i;
public:
line1(float x,float y,float z)
{
a=x;
b=y;
c=z;
i=abs(a/b);
}
friend void f(line1 & m,line2 & n);
};
class line2
{
private:
float A,B,C,I;
public:
line1(float x,float y,float z)
{
A=x;
B=y;
C=z;
J=abs(A/B);
}
friend void f(line1 & m,line2 & n);
};
void f(line1 & m,line2 & n)
{
if(m.i==n.I && m.c==n.C)
cout<<"两直线平行"<<endl;
else if(m.i==n.I && m.c!=n.C)
cout<<"重合"<<endl;
else
cout<<"相交"<<endl;
}
void main()
{
line1 d(1,2,3);
line2 x(1,2,3);
f(d,x);
}

[hkk333]

帮你编辑一下代码，方便看.......

#include <iostream>
#include <math>
using   namespace   std;
class   line2;
class   line1
{
private:
float   a,b,c,i;
public:
line1(float   x,float   y,float   z)
{
a=x;
b=y;
c=z;
i=abs(a/b);
}
friend   void   f(line1   &   m,line2   &   n);
};
class   line2
{
private:
float   A,B,C,I;
public:
line1(float   x,float   y,float   z)
{
A=x;
B=y;
C=z;
J=abs(A/B);
}
friend   void   f(line1   &   m,line2   &   n);
};
void   f(line1   &   m,line2   &   n)
{
if(m.i==n.I   &&   m.c==n.C)
cout < <"两直线平行" < <endl;
else   if(m.i==n.I   &&   m.c!=n.C)
cout < <"重合" < <endl;
else  
cout < <"相交" < <endl;
}
void   main()
{
line1   d(1,2,3);
line2   x(1,2,3);
f(d,x);
}

[hkk333]

已经帮你改好，一段程序居然有2处拼写错误，楼主还是认真点吧，如此粗心可不行

// sometest.cpp : Defines the entry point for the console application.
//
#include <iostream.h>
#include <math.h>

//using namespace std; 

class line2;

class line1 
{
public: 
	line1(float x,float y,float z) { a=x; b=y; c=z; i=abs(a/b); } 
	friend void f(line1 & m,line2 & n); 
private:
	float a,b,c,i;
}; 

class line2
{
public: 
	line2(float x,float y,float z) { A=x; B=y; C=z; I=abs(A/B); }
	friend void f(line1 & m,line2 & n);
private: 
	float A,B,C,I;
};

void f(line1 & m,line2 & n) 
{ 
	if(m.i==n.I && m.c==n.C) 
		cout <<"两直线平行"  <<endl; 
	else if(m.i==n.I && m.c!=n.C) 
		cout <<"重合" <<endl; 
	else 
		cout <<"相交" <<endl;
} 

void main()
{
	line1 d(1,2,3);
	line2 x(1,2,3);
	f(d,x);
}

[hkk333]

首先是line2类里面的构造函数居然是line1()
然后J=abs(A/B);应该是I=abs(A/B);

关于头文件的包含..也可以使用
#include <iostream>
#include <math.h>

using namespace std ;

这种形式。

估计楼主没仔细看过编译器的错误提示...要找出错误是不能忽略的.