SEARCH MATHEMATICA 8 DOCUMENTATION

THIS IS DOCUMENTATION FOR AN OBSOLETE PRODUCT.
SEE THE DOCUMENTATION CENTER FOR THE LATEST INFORMATION.

Mathematica > Core Language > Expressions > Testing Expressions >

Mathematica > Core Language > Procedural Programming > Conditionals > Testing Expressions >

Built-in Mathematica Symbol

OddQ

OddQ[expr]
gives True if expr is an odd integer, and False otherwise.

OddQ[expr] returns False unless expr is manifestly an odd integer (i.e., has head Integer, and is odd).

Test whether 9 is odd:

OddQ gives False for non-numeric expressions:

Test whether 9 is odd:

OddQ gives False for non-numeric expressions:

Test whether a vector consists of odd integers:

An integer is either odd or even. Use EvenQ to check that an integer is even:

Odd integers are not divisible by 2:

Expressions that represent odd integers but do not evaluate explicitly will still give False:

It is necessary to use symbolic simplification first: