Check IF file exists or not - C, C++ Programming Language

This may be the best way for checking if a file exists or not. 
#include <conio.h> #include <stdio.h> #include <io.h> int exists(const char *filename); void main() { int a=2; a= exists("c:\m.txt"); if(a==0) { printf("File Exists"); }else{ printf("File Not Exists"); } } int exists(const char *filename) { FILE *file; if (file = fopen(filename, "r")) { fclose(file); return 0; // if file exists it return 0. } return 1; // if file not exists it return 1. }