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- 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.