need help for getline() funciton

This is a discussion on need help for getline() funciton within the C++ Programming forums, part of the General Programming Boards category; hi; for example i have a file includes x lines how can i read all lines in a for loop? ...

  1. #1
    Registered User
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    Jan 2002
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    need help for getline() funciton

    hi;
    for example i have a file includes x lines
    how can i read all lines in a for loop?

    [code]

    for (..i..)
    {
    ptr.getline(buffer[i],100);
    }

  2. #2
    Registered User
    Join Date
    May 2003
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    12
    try
    for(int i=0;!filename.eof();i++)

  3. #3
    Guest Sebastiani's Avatar
    Join Date
    Aug 2001
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    Waterloo, Texas
    Posts
    5,699
    That is incorrect. Since the end of file condition does not occur till after a read, the comparison is required at the top of the loop.
    Code:
    >> while(file.getline(/*this goes first*/) && file.good()) // certain
    >> {/*do it*/}
    >> if(!file.eof()) // optional
    >> {/*handle bad errors*/}
    Code:
    bool fun(bool value)
    {
        return std::pow(std::exp(1), std::complex<float>(0, 1) 
        * std::complex<float>(std::atan(1)*(1 << (value + 2))))
        .real() > 0;
    }

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