![]() For example, if you want to look up information about the Apple iMac, but want to avoid results about apples (the fruit) you might search for "Apple AND iMac NOT fruit." This would produce results about iMac computers, while avoiding results with the word "fruit." While most search engines support boolean operators, their syntax requirements may vary. When you enter keywords in a search engine, you can refine your search using boolean operators. Complex boolean expressions can be expressed as a series of logic gates.īoolean expressions are also supported by most search engines. Therefore, computer processors perform complex calculations by linking multiple binary (or boolean) statements together. Of course, most calculations require more than a simple true/false statement. For example, a true statement returns a value of 1, while a false statement returns a value of 0. Since computers operate in binary (using only zeros and ones), computer logic can often be expressed in boolean terms. NOT x - returns True if x is false (or null) returns False if x is true.x XOR y - returns True if only x or y is true returns False if x and y are both true or both false.x OR y - returns True if either x or y, or both x and y are true returns False only if x and y are both false.x AND y - returns True if both x and y are true returns False if either x or y are false.These boolean operators are described in the following four examples: Boolean expressions use the operators AND, OR, XOR, and NOT to compare values and return a true or false result. Boolean, or boolean logic, is a subset of algebra used for creating true/false statements.
0 Comments
Leave a Reply. |