To make life easier, C Programmers typically define the terms “true” and “false” to have values 1 and 0 respectively. For interpretation, Zero is interpreted as false and anything non-zero is interpreted as true. ![]() Zero is used to represent false, and One is used to represent true. ![]() Because NULL and nil zero values, they evaluate to “false” in conditional expressions. Can boolean be yes or no?īy convention, we use the BOOL type for Boolean parameters, properties, and instance variables and use YES and NO when representing literal Boolean values. This would limit the search results to only those documents containing the two keywords. For example, a Boolean search could be “hotel” AND “New York”. ![]() What is an example of a Boolean search?īoolean search is a type of search allowing users to combine keywords with operators (or modifiers) such as AND, NOT and OR to further produce more relevant results. When used in library databases (typed between your keywords) they can make each search more precise – and save you time! What are the 3 logical operators?Ĭommon logical operators include AND, OR, and NOT. What are the 6 Boolean operators?īoolean operators are the words “AND”, “OR” and “NOT”. For example, searching on dengue AND malaria AND zika returns only results that contain all three search terms. AND searches find all of the search terms. There are three basic Boolean search commands: AND, OR and NOT.
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