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Terminating a String

  #1  
Oct 31st, 2006
I have a palindrome program.Is there a way to ensure user input terminated in a string by a punctuation mark (e.g. ‘!’, ‘.’, or ‘?’.) in an array? And how do i get the program to exclude commas?

eg A man, a plan, a canal, Panama! bosters a problem because when read backwards the commas are placed incorrectly whereas
A man , a plan , a cana l, Panama! would read correctly how do i make it work either way?
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Re: Terminating a String

  #2  
Oct 31st, 2006
Hmm.. a palindrome actually doesnt consider spaces, punctuation marks and character case (upper or lower).

Maybe for a more detailed explanation, you might want to look here:
http://www.daniweb.com/techtalkforums/thread59789.html
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Re: Terminating a String

  #3  
Nov 1st, 2006
ok but how can I ensure that that user input is terminated using punctuation marks such as ? or !
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Re: Terminating a String

  #4  
Nov 1st, 2006
Hmm.. maybe something like:
  • Accpet the input from the user using fgets()
  • Remove the trailing newline at the end of the string accepted from the user. (must do, check my function remove_newline())
  • Check if the last character of the string is ! or ? by using something like:
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c Syntax (Toggle Plain Text) 
  1. // accept input
  2. // remove trailing newline and replace with null character '\0'
  3. int string_length = strlen( my_string ) ;
  4. if( my_string[string_length - 1] == '?' || 
  5.                           my_string[string_length - 1] == '!' )
  6. {
  7.     // continue with the normal functionning
  8. }
  9. else
  10. {
  11.     // duck out of program, using return 1 or exit(1) or again 
  12.    // ask for user input
  13. }
Last edited by ~s.o.s~ : Nov 1st, 2006 at 10:44 am.
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Re: Terminating a String

  #5  
Nov 4th, 2006
So how ultimately what is the best way to remove or ignore white spaces in the array?
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Re: Terminating a String

  #6  
Nov 4th, 2006
Palindromes are basically related to alphabets, so to ignore whitespaces in general you can traverse the whole character array, processing characters only when the isalpha( my_character ) condition is satisfied, otherwise skip that character.

Something like:
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while( ! isalpha( character ) )
{
    // skip the character and move on
}
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Re: Terminating a String

  #7  
Nov 4th, 2006
ok thaks, wait is this the method used in the earlier palindrone program?
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Re: Terminating a String

  #8  
Nov 4th, 2006
Huh , which earlier program ?
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Re: Terminating a String

  #9  
Nov 4th, 2006
Umm...The one in the link you provided here:

http://www.daniweb.com/techtalkforums/thread59789.html
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Re: Terminating a String

  #10  
Nov 4th, 2006
Yes its the same method.

For a well detailed and excellent algorithm see HERE.
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