File input / strings help

This is a discussion on File input / strings help within the C++ Programming forums, part of the General Programming Boards category; Could use some help i am having some hard time figuring this out. What i need to do is read ...

  1. #1
    Registered User
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    Mar 2011
    Posts
    9

    File input / strings help

    Could use some help i am having some hard time figuring this out. What i need to do is read in a file and then based on its file extension decide what to do i.e. ".cpp" or ".html"
    I though i could just read in the file name then the extension but was not allowed. lol So any help would be appricated here is my code so far for the file input.
    Im pretty sure this could be done with strings?

    Code:
    #include <iostream>
    #include <string>
    #include <fstream>
    using namespace std;
    char* filename;
    ...
    int main ()
    {
        ...
        
        cout <<"Please enter the name of the file" << endl; 
    	filename=new char;
    	cin >> filename;
    
    ...
    }
    Last edited by seanman13579; 03-30-2011 at 09:51 AM.

  2. #2
    Registered User whiteflags's Avatar
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    Yes you can do it with a string, call string::compare to do it.

  3. #3
    C++まいる!Cをこわせ! Elysia's Avatar
    Join Date
    Oct 2007
    Posts
    22,548
    Your code is a ticking time bomb, plus it's unnecessary. You don't seem to understand dynamic memory fully. I would just recommend you make a std::string, then use std::getline.
    Quote Originally Posted by Adak View Post
    io.h certainly IS included in some modern compilers. It is no longer part of the standard for C, but it is nevertheless, included in the very latest Pelles C versions.
    Quote Originally Posted by Salem View Post
    You mean it's included as a crutch to help ancient programmers limp along without them having to relearn too much.

    Outside of your DOS world, your header file is meaningless.

  4. #4
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    Yes Elysia i realize this that was something i just threw together real fast a rough draft if you will. lol here is what it would look like

    Code:
    #include <iostream>
    #include <string>
    #include <fstream>
    using namespace std;
    
    int main ()
    {
         string str, tmp;
      std::string filename;
    
    
        cout <<"Please enter the name of the file" << endl; 
    	cin >> filename;
    
    	
    	ifstream myfile(filename.c_str());
    	while(getline(myfile, tmp))
    	{
    	str += tmp;
        }
      
      
    
    return 0;
    }
    Also thanks whiteflag the compare worked perfectly.
    Last edited by seanman13579; 03-30-2011 at 11:21 AM.

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