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A comparison is an evaluation of similarities and differences - described by Gregory Bateson in his book Mind and Nature as the two quanta of experience.

In computer programming


In computer programming, when one compares the two values x and y, a negative number often indicates x < y, zero x == y and a positive number x > y. Even when two values are not integers, e.g. literal strings, this convention is largely adopted. For example, strcmp returns -1, 0, or 1 according to the lexicographical order, and qsort expects the comparison function to return values according to this convention. This is because it is efficient to do the subtraction x - y resulting in the directional signs above. In sorting algorithms, the efficiency of comparison code is critical since it is one of the major factors of sorting performance.

Sometimes, particularly in object-oriented programming, the comparison raises questions of datatypes and inheritance, equality and identity. It is often necessary to distinguish between:

  • two objects with different datatypes both related to another datatype, e.g. an orange and a lemon, both being citrus fruit
  • two different objects of the same type, e.g. two hands
  • two objects being equal but distinct, e.g. two $10 banknotes
  • two different references to the same object, e.g. two nicknames for the same person

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Knew I shouldn't have started shopping for headphones. Now I'm in this spiral pit of product reviews and price comparisons. Could be worse.
russfischer (Russ Fischer) Wed, 23 Dec 2009 00:39:24 -0000
Knew I shouldn't have started shopping for headphones. Now I'm in this spiral pit of product reviews and price comparisons. Could be worse.
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