looping over numbers from a txt file using fstream - c++

Question

I'm a bit new to C++ so I'm trying to keep things simple.
I'm trying to apply a loop that simply prints out each number from a txt file. And there are A LOT of numbers.
I've been trying to do this with a for loop but with no success. Here's just one of my attempts:
int main() {
fstream myFile;
myFile.open("resources/numbers.txt");
if (myFile) {
cout << "This file is opened\n";
}
else
return EXIT_FAILURE;
for (i = 1; i<n; i++){
myFile >> n;
cout << n;
}
return 0;
}
I'd prefer not to use arrays or getLine. I just want to take every number from the txt file and print it to the user until every number is printed.
Is there an easy way to do this?
Thanks a million!

Answer 1

Here is how I’d print the number in the file:
std::copy(std::istream_iterator<int>(myFile),
std::istream_iterator<int>(),
std::ostream_iterator<int>(std::cout, “\n”));
In you example you didn’t declare n so it isn’t clear what the proper type is. The code assumes int and that <algorithm> and <iterator> are included.

Answer 2

#include <cstdlib> // EXIT_FAILURE
#include <iostream>
#include <fstream>
int main()
{
std::ifstream myFile{ "resources/numbers.txt" }; // use c-tor to open
// ^ ifstream ... we only want to read
if (!myFile.is_open()) {
std::cerr << "File couldn't be opened for reading :(\n\n";
return EXIT_FAILURE;
}
std::cout << "File is open for reading.\n\n";
int number;
while(myFile >> number) // as long as integers can be extracted from the stream,
std::cout << number << '\n'; // print them.
} // no need to return anything as main() returns 0 when not return statement
// is present.