uppercase check function

[gelatine]

i was reading the documentation about specifieing templates when i discovered a function about uppercase chars. i didnt get anything of it. can someone please explain me what theyre doing here.

code:

char uppercase ()
    {
      if ((element>='a')&&(element<='z')) // i think this is to make sure the char is one of the alphabet
      element+='A'-'a'; // element=element + 'A'-'a' ??
      return element; //i know this
    }

the element char was already initialized above

[Jikax]

first you must understand ascii. characters are just numbers: http://www.asciitable.com/

if ((element>='a')&&(element<='z'))

this checks the character "element" whether it is lower case. (see ascii table)
When it is lower case a number is added to make ik Upper case.

'A' = 65
'a' = 97

so -32 (65 - 97) is added to the element when it is lower case.

example:

element = 'v'
so element is also 118

-32 is added to the 118, this results in 86.
ascii 86 is the same as 'V'.

and the new element is returned.

[gelatine]

so the whole thing would resulted the same when they should have written:
element-=32; instead of element+='A'-'a';

[Jikax]

yes your right

[gelatine]

thanks