hello, i wrote a little program, but There are some problems.
Can anyone help me?

here is the code:

#include <iostream>
#include <math.h>
#include <fstream>

using namespace std;

bool tikrinimas(const char *filename)
  ifstream failas(filename);

  return failas;

int main ()
	bool failas;

	if (failas==true)

{cout << "good";}

{cout <<"bad";}

return 0;

You neglected to mention the problems.

The problem, that failas is always false...

Probably because you meant to initialize it:

bool failas = tikrinimas("example.txt");