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As an example of how to make this simpler.


#include <iostream>
#include <fstream>
#include <cstdlib> // exit()
#include <cctype> // isalpha(), tolower()

int main() {
std::ifstream...

The whole "design" of this program is quite bad. Think about what you actually want done. Here's how I understand it:


From a text file, write to another file all the letters separated by commas....