Thread: Trick with strings help/questions

Question 1:
Hey guys, I got a question about strings. Suppose *p points to a character in a string, say character 'A'. I have a pointer *r and I wish to point *r such that

Code:

*r = *p | 0x20;

How does 'A' turn to 'a'???

Question 2:
Also, What should I prepare for when dealing with strings? The question above was from a past final for my C class.

What is the ASCII value of 'A' vs. 'a', and what is the relationship of these to the value of 0x20?

IMHO, it's a silly trick that you'll never need to do in the real world; in fact, I would view someone writing something like that to be somewhat of a software sociopath.

So....

'a' is 97 in decimal, in binary:

0110 0001

'A' is 65 in decimal, in binary:

0100 0001

and let's OR it with 0x20...
thats...

0010 0000
0100 0001
--------------
0110 0001

there we have it.
2 of my profs this yr are scary