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Groups > comp.lang.c > #165709

Re: Memorizing C operator precedence

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Alan Mackenzie <acm@muc.de> writes:
>Breaking up a complicated expression _fragments_ it

  Example for the refactor "extract variable" in pseudocode:

return quantity * item_price -
  max(0, quantity - 500) * item_price * 0.05 +
  min(quantity * item_price * 0.1, 100);

  ------------------>

const base_price = quantity * item_price;
const quantity_discount = 
max( 0, quantity - 500 )* item_price * 0.05;
const shipping = min( base_price * 0.1, 100 );
return base_price - quantity_discount + shipping;

  . There is no reason to fall behind the state of the art.
  Suggested reading:

Refactoring - Improving the Design of Existing Code
by Martin Fowler,
publishing house Addison-Wesley Educational Publishers Inc.

  . Don't worry! It is written in an easy-to-understand way
  so that most programmers can get it.

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