Compiler Error- Overloaded function, invalid conversion

[enbulldog]

I am working on a program to "encrypt" a text file supplied by the user, and writing to another file also given by the user. I am very new to programming and am having trouble passing information from file to program and back to file. I am close, but I have comiler errors. Here is my code so far:

#include <iostream>
#include <cctype>
#include <fstream>
#include <iomanip>
using namespace std;

//Function: displayHeader
//Description: Outputs program header to screen
//Inputs: None
//Outputs: Header to screen
//Usage: displayHeader()
void displayHeader();

void getFile(char& fileIn, char& fileOut);

char charShift (char toEncrypt);

char encrypt(char symbol);

bool firstHalf(char symbol);

int main()
{
  char fileIn[13];
  char fileOut[13];
  char runAgain;
  ifstream file1;
  ofstream file2;
  displayHeader();
  do
  {
    void getFile(char& fileIn, char& fileOut);
    ifstream file1(fileIn[]);
    if (!file1||!file2)
    {
      cout << "Error opening input file." << endl;
    }
    char encrypt(file1);
    file1.close;
    file2.close;
    cout << "Would you like to run program again? (y/n)" << endl;
    cin >> runAgain;
  }
  while (runAgain=='Y'||runAgain=='y');
}
  
void getFile(char& fileIn, char& fileOut)
{
  cout << "Please enter name of file to be encrypted." << endl;
  cin >> fileIn;
  cout << "Please enter file to write to." << endl;
  cin >> fileOut;
}

char encrypt(char symbol)
{
  char encryptChar;
  char nextCh;
  nextCh=symbol;
  file1.get(nextCh);
  while (!file1.eof())
  {
    if (isalpha(nextCh))
    {
      encyptChar=charShift(nextCh);
      file2 << encryptChar;
    }
    else
    {
      file2 << nextCh;
    }
  }
}

char charShift(char toEncrypt)
{
  if (firstHalf(toEncrypt))
  {
    return toEncrypt+13;
  }
  else
  {
    return toEncrypt-13;
  }
}

bool firstHalf(char symbol)
{
 if((symbol>='A'&&<='M')||(symbol>='a'&&<='m'))
  {
    return 1;
  }
  else
  {
    return 0;
  }
}

To which I receive these following compiler errors:

Here (Photo)

any help would be useful, thanks

[Banfa]

    void getFile(char& fileIn, char& fileOut);

This is not a function call it is a function definition and as such does nothing so fileIn and fileOut are still uninitialised. It should be

    getFile(fileIn, fileOut);

    ifstream file1(fileIn[]);

The square brackets are a syntax error in this line remove them

  
void getFile(char& fileIn, char& fileOut)
{
 <snipped>
}

You have declared references to a char but are trying to pass a char array into this function, either declare them as pointers

  
void getFile(char *fileIn, char *fileOut)
{
 <snipped>
}

or declare them as references to char array

  
void getFile(char (&fileIn)[13], char (&fileOut)[13])
{
 <snipped>
}

    char encrypt(file1);

the char is wrong and you pass a char array to encrypt

char encrypt(char symbol)
{
    <snipped>
}

But it is defined as accepting a char