#include <iostream>

using namespace std;

int main()
{
   FILE * infile; 
   
   infile = fopen("some_file.txt", "r"); 

   if(infile == NULL)
   {
      cout<<"Error opening file\n";
   }
   else
   {
      cout<<"File opened successfully\n";
      fclose(infile);
   }

   return 0;
}