我有一个程序不知道怎么了， 在VC上运行了，有一个错误。我不知道怎么改，可是我自己看是没有问题的，请大家帮我改一下啊，最好告诉我什么原因，运行的结果是怎么得来的。谢谢啊！ static int m=1; #include <stdio.h> class CType { int n; friend CType& operator ++ (const CType& q); friend void main(); friend CType operator -(const CType & r); public: CType(int r) {n=r;} int operator !();

}; int CType::operator !() { printf("%d!,",m++);} CType operator -(const CType & r)

{ printf("%d-,",m++); return CType (-r.n); } CType operator ++(CType & q) { printf("%d++,",m++); ++q.n ; return q ; } void main() { CType a(2),b(-1); a=!-++b; printf("a=%d\n",a.n); a=(operator -(operator++(b))).operator!(); printf("a=%d",a.n); }

错误是： files\microsoft visual studio\myprojects\021\021.cpp(27) : error C2248: 'n' : cannot access private member declared in class 'CType' e:\program files\microsoft visual studio\myprojects\021\021.cpp(5) : see declaration of 'n' 劳驾啊！

//程序我没帮你细看，改了几处错误，可以运行了。
static int m=1;

#include &lt;stdio.h&gt;

class CType
{
  int n;
friend CType &amp; operator ++(CType &amp;  q);
friend CType operator -(const CType &amp; r);
public:
    CType(int r)
    {
        n=r;
    }
  int operator !();
    int getValue()
    {
        return n;
    }
};

int CType::operator !()
{   
    printf("%d!,",m++);
    return !n;
}

CType operator -(const CType  &amp; r)
{
    printf("%d-,",m++);
    return CType (-r.n);
}

CType &amp; operator ++(CType &amp;  q)
{
    printf("%d++,",m++);
    ++q.n;
    return q;
}

int main()
{      
    CType a(2),b(-1);
    a=!-++b;
    printf("a=%d\n", a.getValue());
    a=(operator -(operator++(b))).operator!();
    printf("a=%d",a.getValue());

    return 0;
}

谢谢你的帮助啊。
我的那个程序的错误关键在哪里啊？
我的结果中a值是怎么得来的啊 ？
劳驾再帮我看看啊，谢谢了。
static int m=1;

#include &lt;stdio.h&gt;

class CType
{
  int n;
friend CType &amp; operator ++(CType &amp;  q);
friend CType operator -(const CType &amp; r);
public:
    CType(int r)
    {
        n=r;
    }
  int operator !();
    int getValue()
    {
        return n;
    }
};

int CType::operator !()
{   
    printf("%d!,",m++);
    return !n;
}

CType operator -(const CType  &amp; r)
{
    printf("%d-,",m++);
    return CType (-r.n);
}

CType &amp; operator ++(CType &amp;  q)
{
    printf("%d++,",m++);
    ++q.n;
    return q;
}

int main()
{      
    CType a(2),b(-1);
    a=!-++b;
    printf("a=%d\n", a.getValue());
    a=(operator -(operator++(b))).operator!();
    printf("a=%d",a.getValue());

    return 0;
}