请教...

[SDFsd24]

#include <iostream>

using namespace std;

template <typename T>
class tnode
{
public:
T nodeValue;
tnode<T> *left, *right;

tnode() {}
tnode(const T& item,tnode<T> *lptr = NULL,tnode<T> *rptr = NULL) {}
};

template <typename T>
void inorderOutput(tnode<T> *t,const string& separator = " ")
{
if(t != NULL)
{
inorderOutput<T>(t->left, separator);
cout << t->nodeValue << separator;
inorderOutput<T>(t->right, separator);
}
}

int main()
{
tnode<int> *p,*q,*r;
p = new tnode<int>(8);
q = new tnode<int>(20);
r = new tnode<int>(1,p,q);
inorderOutput<int>(r,"haha");
}
请问下这里哪里出错了,还有采用默认的该怎么弄...

[dxms8]

r = new tnode<int>(1,p,q);
这个1不行的吧，是不是需要一个引用？

[小楫轻舟]

#include <iostream>
#include <string>                     // --------------------------加这个

using namespace std;

template <typename T>
class tnode
{
public:
T nodeValue;
tnode<T> *left, *right;
     
tnode() {left = NULL; right = NULL;}    // --------------------left,right初始化
tnode(const T& item,tnode<T> *lptr = NULL,tnode<T> *rptr = NULL) 
{                                      // --------------------nodeValue,left,right初始化
	nodeValue = item;
	left = NULL; 
	right = NULL;
}            
};

template <typename T>
void inorderOutput(tnode<T> *t,const string& separator = " ")
{
if(t != NULL)
{
inorderOutput<T>(t->left, separator);
cout << t->nodeValue << separator;
inorderOutput<T>(t->right, separator);
}
}

int main()
{
tnode<int> *p,*q,*r = NULL;
p = new tnode<int>(8);
q = new tnode<int>(20);
r = new tnode<int>(1,p,q);
inorderOutput<int>(r,"haha");
}

[SDFsd24]

写蒙了...