Getline error

Hello,
I cannot use a string and must read the characters of a file into an char array. However, I'm having problems with the getline function. Also I would appreciate if someone could explain how to separate the what I'm reading in onto new lines for every new word.

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#include <iomanip>
#include <iostream>
#include <cstdlib>
#include <string.h>
#include <fstream>
#include <istream>
using namespace std;

    //Function prototypes
    void fileChecker();
    void readInFile(char);
    void passVal();

int main ()
{
    // Variable Declaration
        char passwords [40];



    // Calling fileChecker function to check if passwd.txt exists
    fileChecker();

    // reading file into a char variable called passwords.
    readInFile(passwords[40]);





}

//Function name: fileChecker
//Purpose : Check if file exists/ and is open
// Parameters :
// Returns: nothing
void fileChecker()
{

   // Read in file
    fstream fin;

    fin.open("passwd.txt");

    // checks if file exists or not.
        if (!fin.is_open())
    {
        cout << "Error, Text file passwd.txt does not exist in current directory." << endl;
        system("PAUSE");
    }

}

//Function name: readInFile
//Purpose : Reads passwd.txt into variable
// Parameters : passwords
// Returns: nothing
void readInFile(char passwords[])
{
    fstream fin;

   // posChar = (passwords, '\0');

    fin.open("passwd.txt");
    // while not end of file read / display passwords.
    while(fin.good())
    {
        getline(fin, passwords);

   /* for (char i; i < 40; i++)
    {
         fin >> passwords[i];
         cout << passwords[i];

    }
    */
    }


}
//Function name: passVal
//Purpose : Validating passwords
// Parameters : passwords
// Returns: message stating whether or not a password is valid
void passVal(char passwords)
{
    fstream fin;


    while (fin.good())
    {


readInFile(passwords[40]); passes the 40th element of passwords[] to the function.
If you want to pass the array, write readInFile(passwords);
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