read word by word from file in C++

Question

this function should read a file word by word and it does work till the last word, where the run stops

void readFile(  )
{
    ifstream file;
    file.open          


        

Answer 1

As others have said, you are likely reading past the end of the file as you're only checking for x != ' '. Instead you also have to check for EOF in the inner loop (but in this case don't use a char, but a sufficiently large type):

while ( ! file.eof() )
{
    std::ifstream::int_type x = file.get();

    while ( x != ' ' && x != std::ifstream::traits_type::eof() )
    {
        word += static_cast(x);
        x = file.get();
    }
    std::cout << word << '\n';
    word.clear();
}

But then again, you can just employ the stream's streaming operators, which already separate at whitespace (and better account for multiple spaces and other kinds of whitepsace):

void readFile(  )
{
    std::ifstream file("program.txt");
    for(std::string word; file >> word; )
        std::cout << word << '\n';
}

And even further, you can employ a standard algorithm to get rid of the manual loop altogether:

#include 
#include 

void readFile(  )
{
    std::ifstream file("program.txt");
    std::copy(std::istream_iterator(file), 
              std::istream_itetator(), 
              std::ostream_iterator(std::cout, "\n"));
}