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I have found this line of code in a game that I study
int charaCode = arc4random() % (126-'!'+1)+'!';
I know what arc4random is but the expression is strange to me.
What is the purpose of
(126-'!'+1)+'!'
It always evaluates to 127.
You interpreted it wrong: the
%operator has a higher precedence than+.So, in effect, you have:
which clips the function result to
0..93and shifts it so that it starts with'!'.So the effective range of what you get is
33..126(which is the range of all visible ASCII characters from!to~).