#include <fstream>
#include <iostream>

using namespace std;

int parse()
{
    ifstream file("text.txt");
    if (!file.is_open()) {
        cout << "File not found." << endl;
        return 1;
    } else {
        ...
    }
    file.close();
    return 0;
}

int main()
{
    if (parse() == 1) {
		return 1;
	}
    cout << "The program is executed correctly." << endl;

    return 0;
}