修改以下程序中的错误

#include <iostream.h>

class X

{public:

int x;

public:

X(int x)

{cout<<this->x=x<<endl;}

X(X&t)

{x=t.x;

cout<<t.x<<endl;

}

void fun(X);

};

void fun(X t)

{cout<<t.x<<endl;}

void main()

{fun(X(10));}

答案：cout<<this->x=x<<endl;要输出this->x=x表达式的值要加括号。［修改］cout<<（this->x=x）<<endl;