Visual C++ assertion failure -

i creating program copy text file. have main.cpp file reads in text file given filenamein array , output copy of text file given filenameout array. have function declared in fileutilities.h

bool textfilecopy(char filenamein[], char filenameout[]); 

then fileutilities.cpp contains

#include <iostream> #include <fstream> #include <string>  #include "fileutilities.h"  bool fileutilities::textfilecopy(char filenamein[], char filenameout[]) {     ifstream fin(filenamein);     if(fin.is_open())     {         ofstream fout(filenameout);          char c;         while(fin.good())         {             fin.get(c);             fout << c;         }          fout.close();         fin.close();          return true;     }     return false; } 

when compile visual c assertion failure. dialog box titled "microsoft visual c++ debug library" contains following:

"debug assertion failed!

program: .....parser.exe

file f:\dd\vctools\crt_bld\self_x86\crt\src\fopen.c

line 53

expression: (file!=null)"

this error gives me 3 options: abort, retry or ignore. abort stops debug. retry brings message in visual studio says "program.exe has triggered breakpoint". if click break here visual studio opens file called "fopen.c" , points line 54 in file.

if continue point visual studio opens file called "dbghook.c" pointer line 62.

where's error? on fin or fout? check corresponding filenamexx, must not null