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GNU Scientific Library Reference Manual - Revised Second Edition (v1.8)
by M. Galassi, J. Davies, J. Theiler, B. Gough, G. Jungman, M. Booth, F. Rossi
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4.6 Testing for Odd and Even Numbers

Macro: GSL_IS_ODD (n)
This macro evaluates to 1 if n is odd and 0 if n is even. The argument n must be of integer type.
Macro: GSL_IS_EVEN (n)
This macro is the opposite of GSL_IS_ODD(n). It evaluates to 1 if n is even and 0 if n is odd. The argument n must be of integer type.
ISBN 0954161734GNU Scientific Library Reference Manual - Revised Second Edition (v1.8)See the print edition