Comparison Operators

Expressions that use comparison operators do not return a number value as do arithmetic expressions. Comparison expressions return either 1, which represents true, or 0, which represents false.

Comparison operators can compare numbers or strings and perform evaluations, such as:
  • Are the terms equal? (A = Z)
  • Is the first term greater than the second? (A > Z)
  • Is the first term less than the second? (A < Z)
For example, if A = 4 and Z = 3, then the results of the previous comparison questions are:

(A = Z)  Does 4 = 3?        0 (False)
(A > Z)  Is 4 > 3?             1 (True)
(A < Z)  Is 4 < 3?             0 (False)

The more commonly used comparison operators are as follows:
Operator
Meaning
=
Equal
==
Strictly Equal
\ =
Not equal
\ ==
Not strictly equal
>
Greater than
<
Less than
> <
Greater than or less than (same as not equal)
> =
Greater than or equal to
\ <
Not less than
< =
Less than or equal to
\ >
Not greater than
Note: The NOT character (¬) is synonymous with the backslash (\). You can use the two characters interchangeably according to availability and personal preference. This book uses the backslash (\) character.

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Timestamp icon Last updated: Tuesday, 7 January 2014


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