Solved

Easy String question

Posted on 2004-08-18
5
244 Views
Last Modified: 2010-04-01
I'm trying to remove some title from the end of a string (phd, M.D. ESQ.)  

and in my debugging process, I am totally confused.  my goal is to remove the string listed in cleantTitle from the end of a string (there can be an extra character at the end of the string).

on removeEnding("PhD"), the index found is 6  which is the END of the second phd.  

1.  Why is Phd matching when it is not in the right case.

2.  Why is it giving me the end of the phd index?

on removeEnding("Phd") called right afterwars, the index found is 1.  which corresponds to nothing, what is going on?

CODE:

void main()
{
      static std::string name("phd phd");
      cleanTitle(name);
}

where

void cleanTitle ( string& str)
{
      cout << "cleanTitle()" << endl;
      removeEnding(str, "Phd");
      removeEnding(str, "PhD");
      removeEnding(str, "M.D.");
      removeEnding(str, "MD");
      removeEnding(str, "test");
}

void removeEnding(string &str, string ending)
{
      cout << "removeEnding()" << endl;
      cout << str.c_str() << endl;
      size_t index = str.find_last_of(ending);
      if(index != string::npos)
      {
            if(index + 2 >= str.size())
            {
                  str.erase(index - ending.size() + 1, ending.size());
            }
      }
      cout << str.c_str() << endl;
}

0
Comment
Question by:jjacksn
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
  • 2
5 Comments
 
LVL 3

Accepted Solution

by:
Tyrsis earned 300 total points
ID: 11837050
Hello,

find_last_of() returns the index of ANY character specified in the string.  I think you want to replace find_last_of() with rfind().

Tyrsis
0
 
LVL 15

Expert Comment

by:efn
ID: 11837497
Also, rfind will give you the index of the beginning of the substring in the searched string, so you will need to revise the index + 2 and index - ending.size() + 1 expressions.

--efn
0
 
LVL 5

Author Comment

by:jjacksn
ID: 11837559
does find do that as well?
0
 
LVL 5

Author Comment

by:jjacksn
ID: 11837563
also, why is it "finding" a string with the wrong case?
0
 
LVL 15

Assisted Solution

by:efn
efn earned 200 total points
ID: 11837861
find finds the first occurrence of the substring.  rfind finds the last occurrence.

It's not finding a string with the wrong case, it's finding a character with the right case.  When str is "phd phd" and ending is "Phd" and you call str.find_last_of(ending), you are not telling it to find the string "Phd".  You are asking for last position in str that contains a 'P' or an 'h' or a 'd'.  The last such position is 6, which contains a 'd'.

--efn
0

Featured Post

What does it mean to be "Always On"?

Is your cloud always on? With an Always On cloud you won't have to worry about downtime for maintenance or software application code updates, ensuring that your bottom line isn't affected.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

In days of old, returning something by value from a function in C++ was necessarily avoided because it would, invariably, involve one or even two copies of the object being created and potentially costly calls to a copy-constructor and destructor. A…
  Included as part of the C++ Standard Template Library (STL) is a collection of generic containers. Each of these containers serves a different purpose and has different pros and cons. It is often difficult to decide which container to use and …
The goal of the video will be to teach the user the difference and consequence of passing data by value vs passing data by reference in C++. An example of passing data by value as well as an example of passing data by reference will be be given. Bot…
The viewer will learn how to clear a vector as well as how to detect empty vectors in C++.

623 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question