testing value of last digit of an integer.

[David McKen]

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
binary
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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