testing value of last digit of an integer.

delta trinity deltatrinity at hotmail.com
Sun Apr 4 23:25:18 CEST 2004

you could use mpz_divisible_p
It is much faster than doing a complete division.

>From: David McKen <cic_3_b at yahoo.com>
>Reply-To: cic_3_b at yahoo.com
>To: "Mailing List, GMP" <gmp-discuss at swox.com>
>Subject: testing value of last digit of an integer.
>Date: Sat, 3 Apr 2004 21:23:08 -0800 (PST)
>I want to check if the last digit of an integer is 5.
>I am contemplating using the mpz_tstbit function to test for the
>representation of 5 which is 0 1 0 1. The leading zero is to prevent
>13 from
>accidentally being detected. Any further out and the binary digits
>would not
>affect the last digit.
>Does anyone know any other way I can do this?
>The numbers are quite large (about 300 digits) and it is already
>known that
>the numbers are odd.
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