On 07/07/2011 07:09 PM, Jim Peters wrote:
Unwanted side effects can happen if you evaluate an expression more
than once, e.g. if you substituted the full expression for every
_tmp2_ in the C code. Expressions with side-effects include function
calls and stuff which modifies variables, e.g. p++. You don't want to
do 'p++' twice or call the function twice.
As the other poster said, C compilers are very good at optimising away
temporary variables.
Jim
Thanks.
I give a clearer example of what you're saying:
y = x++ + --x;
The result depends of compiler.
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