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Which letter or digit ??

Posted on 2000-03-25
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Last Modified: 2010-04-02
How can i determine the  letter or digit from its ASCII code easily/efficiently. I  currently use the switch statement and i have 26 cases for letter and 10 for digit.
i.e.
 switch (letr)
      {
     case 97:
     {
      strcpy(ltr,"a");
      ltr[1] = '\0';
      strcat(expression_buffer,ltr);
      ltr[0] = '\0';
     };break;//end
     .
     .
     .
     case 122:
     {
      strcpy(ltr,"z");
      ltr[1] = '\0';
      strcat(expression_buffer,ltr);
      ltr[0] = '\0';
     };break;//end


and the same thing for digits!!!!

This  makes my code too big

Pls help me find a better way of doing this.

I'm using turbo C++

All suggestions are welcome.

Thanks in advance.
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Question by:onalenna
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2 Comments
 
LVL 30

Accepted Solution

by:
SteveGTR earned 50 total points
ID: 2657433
You could just place the ASCII character in your character array. For example:

if (isalpha(letr) || isdigit(letr))
  {
  ltr[0] = letr;
  ltr[1] = '\0';
  }
0
 
LVL 22

Expert Comment

by:nietod
ID: 2657583
Also (and this is a step in the wrong direction, because Steve's suggestion is clearly better, but for future reference) you can always use a single character in place a number representing the character's aSCII value, for example you could have done

 switch (letr)
{
case 'a':
{
strcpy(ltr,"a");
ltr[1] = '\0';
strcat(expression_buffer,ltr);
ltr[0] = '\0';
};break;//end
case 'b':

etc.

That should be much clearer to understand.  Obviously, don't do it now!
0

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