C++ :: Passing A File Pointer To A Function Is Producing Undesired Output

I am working on a project and decided to try something simple before I start adding items. I am calling a function from main and that function has a file pointer.

Here is my main.cpp

Code: #include <cstdio>
#include <string>
#include <iostream>
#include "main.h"
extern FILE *fp;
using namespace std;
int main(int argc, char *argv[])

[code]....

Here is the function:

Code:
#include <string>
#include <cstdio>
#include <iostream>
#include "main.h"

[Code] ....

My test file consists of several characters and digits. Nothing special and I at this point in time do not have any type of formatting that needs to be adhered to. I am simply wanting to read the file character by character and print it out. When I run the program, I get this symbol:

Code: If I use a printf statement, such as:
Code: printf("%s
", nextChar);

I get a segmentation fault.

My main.h Code:

#ifndef MAIN_H
#define MAIN_H
void scanner(FILE *);
//char getChar(FILE *);
#endif and lastly my scanner.h Code: #ifndef SCANNER_H
#define SCANNER_H
FILE *fp;
#endif