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input/ouput/ looping

Discussion in 'C' started by VickieQuirk, Jun 27, 2006.

  1. VickieQuirk

    VickieQuirk New Member

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    I need help with the following assignment. I just can't seem to get it to work? It just creates a blank file for addresses.
    If anyone can tell me what I am doing wrong I will be forever grateful..

    Ok, here's the assignment:
    You're working for a company that's building an email list from files of mail messages. They would like you to write a program that reads a file called mail.dat, and that outputs every string containing the @ sign to file addresses.dat. For the purpose of this project, a string is defined as it is by the C++ stream reader - a contiguous sequence of non-whitespace characters.
    Here is what mail.dat has in it:
    ---------------------------------------------------------------------------
    From: kadcock@clevelandstatecc.edu
    Date: June 4, 2005

    To: Joe_student@tbrschool.edu

    Joe,

    Hope you have a good semester.

    Regards,
    Ken Adcock
    ---------------------------------------------------------------------------
    Here is what I have done:
    Code:
    #include <iostream>
    #include <fstream> 
    #include <string>
    
    using namespace std;
    
    int main()
    {
    	
    	ifstream inFile;
    	ofstream outFile;
    	string tempString;
    	
    	
    	inFile.open("mail.dat");
    	outFile.open("addresses.dat");
    	
    	while(inFile)
    	{
    		inFile>>tempString;
    		if(tempString.find('@')!=string::npos)
    			outFile<<tempString;
    		
    	}
    	
    	inFile.close();
    	outFile.close();
    	return 0;
    }
     
    Last edited by a moderator: Jun 28, 2006
  2. shabbir

    shabbir Administrator Staff Member

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    The problem is with
    inFile>>tempString;
    which does not allows the whitespaces and it just restricts itself to the first blank character and so does not fetch any email address in tempString. Try using getline instead.
     
  3. VickieQuirk

    VickieQuirk New Member

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  4. shabbir

    shabbir Administrator Staff Member

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    My pleasure.
     

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