Need some help, simple newbee program crashes!!

I really need help, critical error occures when tryong to run the
code, and I have no clue what it could be.
Im attaching the .cpp file to this message, so you can better
see what it is.

#include <iostream>
#include <iomanip>
#include <fstream>
#include <cstdlib>
#include <cstdio>
#include <ctime>
using namespace std;

// *********Function Declarations Start***********
void loadFile();
void saveFile();
void removeFile();
void fileMenu();
//*********Function Declarations End***********

// Function for loading a file START
void loadFile()
{
const int s_length = 100;
const int b_size = 10000;
char fileName[100];
char buffer[b_size];

cout << "Print a name for the file to load" << endl;
cout << "Filename:" << flush;
cin.getline(fileName,(s_length-1),'\n');

ifstream input(fileName,ios::in);

if (!input.is_open())
{ cerr << "Unable to open the file " << fileName << endl; }

while (!input.eof())
{
input.getline(buffer,(b_size - 1));
cout << buffer << endl;
}
input.close();

}
// Function for loading a file END

// Function for saving a file START
void saveFile()
{
const int s_length = 100;
char fileName[s_length];

cout << "Print a name for the file to save" << endl;
cout << "Filename:" << flush;
cin.getline(fileName,(s_length - 1),'\n');cin.get();

ofstream output(fileName,ios::out);

if (output.is_open())
{
output << "---------------------------------------------------" << endl;
output << "This file was created by: [ZiX] STRIDER, using VC++" << endl;
output << "---------------------------------------------------" << endl;
output << endl;

cout << "This text is automatically generated by the program" << endl << "the user will type this text to the file, when I get the" << endl << "program to work properly." << endl;
cout << "The file: " << fileName << " was successfully created" << endl << endl;
}
output.close();

}
// Function for saving a file END

// Function for removing a file START
void removeFile()
{
const int s_length = 100;
char fileName[100];

cout << "Print a name for the file to remove" << endl;
cout << "Filename:" << flush;
cin.getline(fileName,(s_length-1),'\n');

if (remove(fileName) == -1)
{ cerr << "Unable to remove the file " << fileName << endl; }
else
{
cout << "The file: " << fileName << " was successfully removed" << endl << endl; }
}
// Function for removing a file END

// fileMenu Start
void fileMenu()
{
char menuChoice;

while(menuChoice != '4')
{
cout << "* * * * * * * * * * * * * * * * * * * * * * * * *" << endl;
cout << "This is a File Handeling Test, for recall purpose" << endl;
cout << "* * * * * * * * * * * * * * * * * * * * * * * * *" << endl << endl;

cout << "What do you want to do?" << endl;
cout << "1.Create a file" << endl;
cout << "2.Load a file" << endl;
cout << "3.Remove a file" << endl;
cout << "4.Exit program" << endl;
cin >> menuChoice;

switch (menuChoice)
{
case '1':
system("cls");
saveFile();
break;

case '2':
system("cls");
loadFile();
break;

case '3':
system("cls");
removeFile();
break;

case '4':
system("cls");
cout << "Good-Bye!" << endl;
break;

default:
break;
}
}

}
// fileMenu END

int main()
{
fileMenu();
return 0;
}