C + + to determine whether the file exists __c++

With function access, header files are io.h, prototypes:

int access (const char *filename, int amode);

A amode parameter of 0 indicates the existence of the check file, and if the file exists, returns 0, does not exist, returns-1.

This function can also check other file properties:

06 Check Read and Write permissions
04 Check Read permissions
02 Check Write permission
01 Check Execution Permissions
00 checking the existence of files
The experiment was successful under UNIX and VC.
The advantage is that fopen (..., "R") is not good, when no Read permission is lost.
And this file does not have Read permission, you can determine whether the file exists in the
Existence returns 0, does not exist return-1
#include <stdio.h>
int main ()
{

printf ("%d", Access ("111", 0));

--------------------------------------------------------------------------------------------

#include <io.h>
#include <stdio.h>
#include <stdlib.h>

void Main (void)
{
/* Check for existence * *
if (_access ("Access. C ", 0))!=-1)
{
printf ("File ACCESS. C exists\n ");
/* Check for Write permission * *
if (_access ("Access. C ", 2))!=-1)
printf ("File ACCESS. C has write permission\n ");
}
}

Output

File ACCESS. C exists
File ACCESS. C has Write permission