Random Pick from a file

This is a discussion on Random Pick from a file within the C++ Programming forums, part of the General Programming Boards category; Hi all, Can anybody show me how to code a program that will pick a random string of text from ...

  1. #1
    Registered User
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    Jul 2002
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    Random Pick from a file

    Hi all,
    Can anybody show me how to code a program that will pick a random string of text from a file stored on the local drive of a pc and display it on the screen? I have a copy of Visual C++ 6.0...if that makes any difference. Any help would be appreciated!
    MCorn

  2. #2
    unleashed alphaoide's Avatar
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    source: compsci textbooks, cboard.cprogramming.com, world wide web, common sense

  3. #3
    Registered User
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    34

    Errors?

    Hi,
    I appreciate the help on this. I was given the following code:
    Code:
    #include<iostream>
    #include<fstream>
    #include<string>
    #include<ctime>
    #include<cstdio>
    int main()
    {
    fstream readfile;
    int num=0,max=0;
    char a;
    string b;
    readfile.open("test.txt",fstream::in);
    srand((unsigned int)time(0));
    while(readfile>>b)
    {
    max++;
    }
    readfile.close();
    cout<<"press 1 to show name,else to exit"<<endl;
    cin>>a;
    while(a='1')
    {
    readfile.open("test.txt",fstream::in);
    num=rand()%max;
    while(num>=0)
    {
    readfile>>(b);
    num--;
    }
    cout<<b<<endl;
    cout<<"press 1 to show name,else to exit"<<endl;
    cin>>a;
    cin.ignore();
    readfile.close();
    }
    return 0;
    }
    When I tried to run it I get errors. It may be where I placed the test.txt file. (C:\test.txt) Can anybody tell me where I've gone wrong? I'm trying to draw a random name from a text file and display it on the screen. In the text file I have as follows:
    Joe Blow
    Homer Simpson
    Sally Lastname
    etc..
    etc..

    Thanks for any help!
    MCorn

  4. #4
    ATH0 quzah's Avatar
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    14,826
    Code tags are nice. However, there's a lot to be said for good indentation also. Or any indentation for that matter...

    I was given the following code:
    You know, a better way to learn would be to try it yourself, instead of relying on someone doing the work for you. But what do I know...

    Quzah.
    Hope is the first step on the road to disappointment.

  5. #5
    Registered User jlou's Avatar
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    Posts
    1,088
    The file test.txt should be in the same directory as the executable (unless you are running this from your IDE, in which case it depends on the IDE).

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