How to dynamically allocate memory to an array to read n characters from a file?

Question

Let's say I have the following:

#include <iostream>
#include <fstream>

int size;
char *charArray = nullptr;

ifstream fin.open("strings.txt");
// More code...

delete [] charArray;
charArray = nullptr;

How would I dynamically allocate memory to the array so that it could store any number of characters from a file, regardless of the file size? For example, if the file is 50 bytes how would I set int size to 50?

Answer 1

Thanks for your answer @kurwius. it helped to point me in the right direction for what I needed. 👍