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#include <iostream>
#include <cstdlib>
#include <ctime>
#include <string>
 
using namespace std;
 
struct school
{
int key;
school  *p_right;
school *p_left;
};
 
school *locale(school *NCT,  int key)
{
if (key < NCT->key)
{
	if (NCT->p_left == NULL)
		return NCT;
	else
		return locale(NCT->p_left, key);
}
else
{
	if (NCT->p_right == NULL)
		return NCT;
	else
		return locale(NCT->p_right,key);
}
}
 
void add (school *site, int key)
{
	school *newstu = new school;
	newstu->key = key;
	if (key > site->key)
		site->p_right = newstu;
	else
		site->p_left = newstu;
}
 
void generate(school *NCT, int n)
{
int key;
for (int i = 0; i<n;i++)
{
	key = rand()%100;
	school *site = locale(NCT, key);
	add(site, key);
}
}
 
sortschoolout(school *NCT)
{
if(NCT->p_right == NULL && NCT->p_left == NULL)
	cout<<NCT->key;
else if(NCT->p_right == NULL)
{
	sortschoolout(NCT->p_left);
	cout<<NCT->key;
}
else if(NCT->p_left == NULL)
{
	sortschoolout(NCT->p_right);
	cout<<NCT->key;
}
else
{
	sortschoolout(NCT->p_left);
	cout<<NCT->key;
	sortschoolout(NCT->p_right);
}
}
 
main()
{
school *NCT = NULL;
srand(time(NULL));
generate(NCT,10);
sortschoolout(NCT);
}
 

prog.cpp: In function 'school* locale(school*, int)':
prog.cpp:22:10: error: reference to 'locale' is ambiguous
   return locale(NCT->p_left, key);
          ^
prog.cpp:15:9: note: candidates are: school* locale(school*, int)
 school *locale(school *NCT,  int key)
         ^
In file included from /usr/include/c++/5/bits/ios_base.h:41:0,
                 from /usr/include/c++/5/ios:42,
                 from /usr/include/c++/5/ostream:38,
                 from /usr/include/c++/5/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/5/bits/locale_classes.h:62:9: note:                 class std::locale
   class locale
         ^
prog.cpp:29:10: error: reference to 'locale' is ambiguous
   return locale(NCT->p_right,key);
          ^
prog.cpp:15:9: note: candidates are: school* locale(school*, int)
 school *locale(school *NCT,  int key)
         ^
In file included from /usr/include/c++/5/bits/ios_base.h:41:0,
                 from /usr/include/c++/5/ios:42,
                 from /usr/include/c++/5/ostream:38,
                 from /usr/include/c++/5/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/5/bits/locale_classes.h:62:9: note:                 class std::locale
   class locale
         ^
prog.cpp: In function 'void generate(school*, int)':
prog.cpp:49:17: error: reference to 'locale' is ambiguous
  school *site = locale(NCT, key);
                 ^
prog.cpp:15:9: note: candidates are: school* locale(school*, int)
 school *locale(school *NCT,  int key)
         ^
In file included from /usr/include/c++/5/bits/ios_base.h:41:0,
                 from /usr/include/c++/5/ios:42,
                 from /usr/include/c++/5/ostream:38,
                 from /usr/include/c++/5/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/5/bits/locale_classes.h:62:9: note:                 class std::locale
   class locale
         ^
prog.cpp: At global scope:
prog.cpp:54:26: error: ISO C++ forbids declaration of 'sortschoolout' with no type [-fpermissive]
 sortschoolout(school *NCT)
                          ^

Standard output is empty