read word by word from file in C++

First of all, don’t loop while (!eof()), it will not work as you expect it to because the eofbit will not be set until after a failed read due to end of file.

Secondly, the normal input operator >> separates on whitespace and so can be used to read “words”:

std::string word;
while (file >> word)
{
    ...
}

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