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Terminating a String

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boujibabe

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Terminating a String

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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Join Date: Jun 2006

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~s.o.s~

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Failure as a human

Re: Terminating a String

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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boujibabe

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Re: Terminating a String

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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Failure as a human

Re: Terminating a String

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:

 Help with Code Tags 
 c Syntax (Toggle Plain Text) 
// accept input
// remove trailing newline and replace with null character '\0'
int string_length = strlen( my_string ) ;
if( my_string[string_length - 1] == '?' || 
                          my_string[string_length - 1] == '!' )
{
    // continue with the normal functionning
}
else
{
    // duck out of program, using return 1 or exit(1) or again 
   // ask for user input
}
// accept input
// remove trailing newline and replace with null character '\0'
int string_length = strlen( my_string ) ;
if( my_string[string_length - 1] == '?' || 
                          my_string[string_length - 1] == '!' )
{
    // continue with the normal functionning
}
else
{
    // duck out of program, using return 1 or exit(1) or again 
   // ask for user input
}

Last edited by ~s.o.s~; Nov 1st, 2006 at 11:44 am.

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boujibabe

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Re: Terminating a String

Nov 4th, 2006

So how ultimately what is the best way to remove or ignore white spaces in the array?

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Failure as a human

Re: Terminating a String

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:

 Help with Code Tags 
 C Syntax (Toggle Plain Text) 
while( ! isalpha( character ) )
{
    // skip the character and move on
}
while( ! isalpha( character ) )
{
    // skip the character and move on
}