determining the end of a piece of text

This is a discussion on determining the end of a piece of text within the C++ Programming forums, part of the General Programming Boards category; Code: int i = 0; string word; vector <string> sentence; do{cin >> word; sentence.push_back(word); i++; }while(i < 10); the idea ...

  1. #1
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    determining the end of a piece of text

    Code:
    int i = 0;
    string word;
    vector <string> sentence;
    
    do{cin >> word; 
       sentence.push_back(word);
       i++;
      }while(i < 10);
    the idea is to get someone to type in a sentence into the console window. This sentence is then broken down into words for further manipulation. However I'd like a more efficient way to determine how many times the loop should execute itself rather than saying 'while(i <10)'.

  2. #2
    Registered User Codeplug's Avatar
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    Code:
    while ((cin >> word).good()) {...}
    //or
    while (!(cin >> word)) {...}
    gg

  3. #3
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    perhaps it's just me, but it doesnt seem to work

  4. #4
    Registered User Codeplug's Avatar
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    The second example is wrong. To use the first you will have to use Ctrl-Z (for DOS) or Ctrl-D (for Unix) to signify EOF. Otherwise you have to use another mechanism for exiting the loop - like entering a "~" or something.

    gg

  5. #5
    Registered User jlou's Avatar
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    Here is an example program that shows you how to do it using a string stream (without having to use Ctrl-Z or Ctrl-D). There might be a better way, but this sems to do what you want.
    Code:
    #include <iostream>
    #include <string>
    #include <vector>
    #include <sstream>
    
    int main()
    {
        // Get input from user.
        std::string inputLine;
        std::getline(std::cin, inputLine);
    
        // Create a stream to parse the line.
        std::istringstream lineStream(inputLine);
    
    	// Loop through each word in the stream.
        std::vector<std::string> sentence;
        while (!lineStream.eof())
        {
            std::string word;
            lineStream >> word;
            sentence.push_back(word);
        }
    
    	// Output one word per line.
        std::vector<std::string>::const_iterator iterWord = sentence.begin();
        std::vector<std::string>::const_iterator iterEnd = sentence.end();
        for (; iterWord != iterEnd; ++iterWord)
        {
            std::cout << *iterWord << std::endl;
        }
    }
    Note that if you are running VC++ 6.0 you will have to fix the bug in getline or this won't work well. Just go to http://www.dinkumware.com/vc_fixes.html and scroll down to the <string> fix.

  6. #6
    Guest Sebastiani's Avatar
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    Waterloo, Texas
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    If this isn't something for school, you might try my generic parser. Aside from ordinary word parsing, you can easily devise all sorts of custom parsing schemes - including the C++ language itself.

    Another good exercise is 'manual' parsing - letter by letter that is.
    Code:
    #include <cmath>
    #include <complex>
    bool euler_flip(bool value)
    {
        return std::pow
        (
            std::complex<float>(std::exp(1.0)), 
            std::complex<float>(0, 1) 
            * std::complex<float>(std::atan(1.0)
            *(1 << (value + 2)))
        ).real() < 0;
    }

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