Programming Forums > Application Development > C++

TecBrain · May 7th, 2005, 6:03 AM

Thanks Ooble.

Ooble · May 7th, 2005, 7:15 AM

Please look over that code and make sure you understand every single word of it.

TecBrain · May 8th, 2005, 11:48 PM

Ok, I dont understand this part:

ch &= 0xDF;

Ooble · May 9th, 2005, 11:39 AM

That can be stretched out to ch = ch & 0xDF;, or ch = ch & 223;. What this does is remove the third bit (from the left), making the character uppercase if it's a letter. You need to understand bit mathematics and the ASCII table to understand this. Basically, it's doing the same thing as ch = toupper(ch);.

Dameon · May 9th, 2005, 10:23 PM

This goes back to a little thing called "clever" programming. I prefer longer, cleaner code that is easier to read. The issue with that, Ooble, is that I'd have to whip out a hex to binary converter and actually think for once. Why not just use toupper? Much easier for both parties.

Berto · May 10th, 2005, 2:45 AM

Ooble's code is more efficient but in this day and age efficiency is not required where as neat easy to unsderstand code it :/

Ooble · May 10th, 2005, 10:44 AM

There's not much point in including an entire header file for one function. If you like, you can make your own toupper function:

(Toggle Plain Text)

char toupper (char ch)
{
    return ch & 0xDF;
}

TecBrain · May 12th, 2005, 4:32 AM

Quote:

Originally Posted by Ooble

That can be stretched out to ch = ch & 0xDF;, or ch = ch & 223;. What this does is remove the third bit (from the left), making the character uppercase if it's a letter. You need to understand bit mathematics and the ASCII table to understand this. Basically, it's doing the same thing as ch = toupper(ch);.

If I understand correctly this part is needed for the case that a user enter c instead of C, am I right?

Ooble · May 12th, 2005, 2:25 PM

Exactly.

TecBrain · May 13th, 2005, 12:29 AM

Very nice and efficient, I never though of this to be honest!!, thanks Ooble.

May 7th, 2005, 6:03 AM	#11
TecBrain Hobbyist Programmer Join Date: Sep 2004 Location: Cyprus Posts: 147 Rep Power: 4	Thanks Ooble. __________________ Personal Portfolio TecBrain Support Forum Linux VS Windows ... Dont Even Think of it .. Distribution: Slackware if (OS==Linux) return success There are 10 kinds of people, those who can read binary numbers and those who can't.

May 7th, 2005, 7:15 AM	#12
Ooble I eat cake for breakfast. Join Date: Jul 2004 Location: In my box. Posts: 4,434 Rep Power: 9	Please look over that code and make sure you understand every single word of it. __________________ Me :: You :: Them

May 8th, 2005, 11:48 PM	#13
TecBrain Hobbyist Programmer Join Date: Sep 2004 Location: Cyprus Posts: 147 Rep Power: 4	Ok, I dont understand this part: (Toggle Plain Text) ch &= 0xDF; ch &= 0xDF; __________________ Personal Portfolio TecBrain Support Forum Linux VS Windows ... Dont Even Think of it .. Distribution: Slackware if (OS==Linux) return success There are 10 kinds of people, those who can read binary numbers and those who can't.

May 9th, 2005, 11:39 AM	#14
Ooble I eat cake for breakfast. Join Date: Jul 2004 Location: In my box. Posts: 4,434 Rep Power: 9	That can be stretched out to ch = ch & 0xDF;, or ch = ch & 223;. What this does is remove the third bit (from the left), making the character uppercase if it's a letter. You need to understand bit mathematics and the ASCII table to understand this. Basically, it's doing the same thing as ch = toupper(ch);. __________________ Me :: You :: Them

May 10th, 2005, 10:44 AM	#17
Ooble I eat cake for breakfast. Join Date: Jul 2004 Location: In my box. Posts: 4,434 Rep Power: 9	There's not much point in including an entire header file for one function. If you like, you can make your own toupper function: (Toggle Plain Text) char toupper (char ch) { return ch & 0xDF; } char toupper (char ch) { return ch & 0xDF; } __________________ Me :: You :: Them

May 9th, 2005, 10:23 PM	#15
Dameon Troll Join Date: Apr 2005 Location: Texas Posts: 732 Rep Power: 4	This goes back to a little thing called "clever" programming. I prefer longer, cleaner code that is easier to read. The issue with that, Ooble, is that I'd have to whip out a hex to binary converter and actually think for once. Why not just use toupper? Much easier for both parties.

May 10th, 2005, 2:45 AM	#16
Berto Programming Guru Join Date: Aug 2004 Posts: 1,022 Rep Power: 5	Ooble's code is more efficient but in this day and age efficiency is not required where as neat easy to unsderstand code it :/

May 12th, 2005, 2:25 PM	#19
Ooble I eat cake for breakfast. Join Date: Jul 2004 Location: In my box. Posts: 4,434 Rep Power: 9	Exactly. __________________ Me :: You :: Them

May 13th, 2005, 12:29 AM	#20
TecBrain Hobbyist Programmer Join Date: Sep 2004 Location: Cyprus Posts: 147 Rep Power: 4	Very nice and efficient, I never though of this to be honest!!, thanks Ooble. __________________ Personal Portfolio TecBrain Support Forum Linux VS Windows ... Dont Even Think of it .. Distribution: Slackware if (OS==Linux) return success There are 10 kinds of people, those who can read binary numbers and those who can't.

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Programming Forums > Application Development > C++

'C-' and 'C+'