help me with global variable and local variable

Question

I want to implement double linked list and get max, min, med from it, but my compiler says the global variable and local variable overrides. I want my max, min stored in global variable and always use it in search algorithm but the error keeps obstructing me. Could help me with the code?

https://code.sololearn.com/c4eHSh6RfW8V/#cpp
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#include <fstream>
#include <string>
#include <sstream>
#include <vector>
#include "DLinkedList.h"
ifstream inputfile;
ofstream outputfile;

int max = 0;
int min = 0;
int med = 0;
_______________~~~~~__________________
void DLinkedList::add(int val, const Elem& e) {
DNode* u = new DNode;
DNode* s = new DNode;
s = header;
u->elem = e;
u->value = val;

if (empty() == 1) addBack(u);
else {
while (s->next->value > u->value) {
s = s->next;
if (s->next->value > u->value) {
u->next = s->next;
u->prev = s;
u->prev->next = s->next->prev = u;
}
}
}
max = trailer->prev->value;
min = header->next->value;
med = findmedian(header);
}

Answer 1

This is not the full code. What is written inside DLinkedList.h header file? You can try changing spelling of ur min, max to minn, maxx. I am not sure that this will work but u should try once. Post ur complete code.