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Nov 1st, 2007

Re: Concatenation of strings without string.h

Click to Expand / Collapse Quote originally posted by Ancient Dragon ...

This function will convert the entire sentence to all upper-case. Hope that's what you want to do.

I just wanted to change the first character in the sentence to uppercase, what would I change to do that?

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Nov 1st, 2007

Re: Concatenation of strings without string.h

>I just wanted to change the first character in the sentence to
>uppercase, what would I change to do that?
Don't call toupper on every character, just on the first one:

C++ Syntax (Toggle Plain Text)
void printSentence(char *sentPtr){
    char *sent = sentPtr;
 
    *sent = toupper((unsigned char)*sent);
 
    while(*sent)
    {
       ++sent;
    }
 
    *sent++ = '.';
    *sent = 0;
    cout << sentPtr << endl;
}
void printSentence(char *sentPtr){
    char *sent = sentPtr;

    *sent = toupper((unsigned char)*sent);

    while(*sent)
    {
       ++sent;
    }

    *sent++ = '.';
    *sent = 0;
    cout << sentPtr << endl;
}

Last edited by Ptolemy; Nov 1st, 2007 at 3:31 pm.

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Nov 6th, 2007

Re: Concatenation of strings without string.h

Click to Expand / Collapse Quote originally posted by Ptolemy ...

Don't call toupper on every character, just on the first one:
C++ Syntax (Toggle Plain Text)
    *sent = toupper((unsigned char)*sent);
*sent = toupper((unsigned char)*sent);

I'm slightly confused as to why the unsigned char makes a difference?

On a side note: I spoke to my professor last week and apparently we are able to use strcat, so I started using that and it fixed the program and its been submitted, however i'd still like to know how to concatenate using my own function just for personal use and education.

weasel7711

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Nov 6th, 2007

Re: Concatenation of strings without string.h

>I'm slightly confused as to why the unsigned char makes a difference?
toupper takes an integer parameter, but that integer is required to be either EOF or in the range of unsigned char. Because sent holds values that you can't be sure fit in that range, a cast forces the range to avoid undefined behavior.

>however i'd still like to know how to concatenate using
>my own function just for personal use and education.
Here's how one might implement strcat:

C++ Syntax (Toggle Plain Text)
char *strcat ( char * dst, const char * src )
{
  char *save = dst;
 
  while ( *dst != '\0' )
    ++dst;
 
  while ( ( *dst++ = *src++ ) != '\0' )
    ;
 
  return save;
}
char *strcat ( char * dst, const char * src )
{
  char *save = dst;

  while ( *dst != '\0' )
    ++dst;

  while ( ( *dst++ = *src++ ) != '\0' )
    ;

  return save;
}

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