As well as the standard arithmetic operators () found in most languages, C provides some more operators. There are some notable differences with other languages, such as Pascal.
Assignment is = i.e. ; ch = `y';
Increment ++, Decrement which are more efficient than their long hand equivalents, for example:- x++ is faster than x=x+1.
The ++ and operators can be either in post-fixed or pre-fixed. With pre-fixed the value is computed before the expression is evaluated whereas with post-fixed the value is computed after the expression is evaluated.
In the example below, ++z is pre-fixed and the w is post-fixed:
This would be equivalent to:
The % (modulus) operator only works with integers.
Division / is for both integer and float division. So be careful.
The answer to: is 1 even if is declared a float!!
RULE: If both arguments of are integer then do integer division.
So make sure you do this. The correct (for division) answer to the above is or or (better) .
There is also a convenient shorthand way to express computations in C.
It is very common to have expressions like: or
This can written in C (generally) in a shorthand form like this:
which is equivalent to (but more efficient than):
So we can rewrite as
and as .
NOTE: that means and NOT .