#include<iostream.h>
class one
{
public:
one()
{
x=1;
}
friend out(one b);
private:
int x;
}
out(one b)
{
cout<<b.x<<endl;
}
main()
{
one a;
out(a);
}错在什么地方?友元函数怎么用?
class one
{
public:
one()
{
x=1;
}
friend out(one b);
private:
int x;
}
out(one b)
{
cout<<b.x<<endl;
}
main()
{
one a;
out(a);
}错在什么地方?友元函数怎么用?
class one
{
public:
one()
{
x=1;
}
void out();
private:
nt x;
};void one::out()
{
std::cout << x << std::endl;
}int main()
{
one a;
a.out();
system("pause");
}
{
cout<<b.x<<endl;
}
既然是一个函数,有返回值就声明返回值类型,没有返回值就定义为void型
class one
{
public:
one()
{
x=1;
}
friend out(one b);
private:
int x;
};
out(one b)
{
b.x +=1;
cout<<b.x<<endl;
return b.x;
}
void main(void)
{
one a;
out(a);
}
class one
{
public:
one()
{
x=1;
}
friend void out(one b);
private:
int x;
}
void out(one b)
{
cout<<b.x<<endl;
}
main()
{
one a;
out(a);
}