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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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Amache internment camp survivors remember tough times
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Standing on a dusty road near the foundations of what were once barracks at the Amache Japanese internment camp, Kumiko Hasegawa begins to make her journey home.
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Dear Amy: Another graduation season has come and gone, which means another display of tacky behavior.
ActiveShopper - Comparison shopping site that that also offers its content through an Internet Explorer toolbar. The toolbar automatically scans, locates, and compares prices for items viewed on e-commerce sites.
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Become - Search engine with a large index of material related to shopping, such as buying guides, reviews, articles, specifications, forums, merchants.
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Best Buy Finder: Software - A software program that simultaneously searches the top online comparison shopping sites for the lowest prices.
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Best Web Buys - Comparison shopping services for books, bikes, music and videos.
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CNET Shopper - Searches for the lowest prices on computers, software, office products and electronics.
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Compare Store Prices UK - Compare prices on thousands of products for UK delivery. Includes the most popular searches.
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Compare123.com - Compare prices on computers, digital cameras, home electronics, DVDs, and music.
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DVD Price Search - Compares DVD prices from multiple stores.
eBuyingguides.com - Buying guides for over two hundred products, including links to rated shopping sites and articles on how to buy.
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mySimon - Comparison shopping site presenting product listings from stores, organized categorically.
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Nextag.com - Price, tax and shipping comparison guide. Product and seller reviews.
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PriceWatch - Searches for the lowest prices on computers, computer components, software and electronics.
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Shopping.com - Compare products, prices and stores.
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ShoppingAisles.com - Compare prices on music, DVDs, VHS, books, magazines and video games.
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ShoppingSpot - Shopping and consumer information portal that simplifies the search for shopping sites by category, product reviews, comparison shopping sites and coupons.
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Shopzilla - Shopping search offering price comparison, reviews and store ratings.
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Street Prices - PC component, PDA, and digital camera price index with graphs of prices over time. Includes e-mail alerts when an item drops below the price specified.
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Yahoo! Shopping - Includes product information, price comparisons and merchant reviews.
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| An old commercial comparing the C64 with the prices of computers from IBM, Apple and Atari. ... Commodore C64 commercial ... | |
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