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(gmp.info)Integer Comparisons

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Comparison Functions
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 - Function: int mpz_cmp (mpz_t OP1, mpz_t OP2)
 - Function: int mpz_cmp_d (mpz_t OP1, double OP2)
 - Macro: int mpz_cmp_si (mpz_t OP1, signed long int OP2)
 - Macro: int mpz_cmp_ui (mpz_t OP1, unsigned long int OP2)
     Compare OP1 and OP2.  Return a positive value if OP1 > OP2, zero
     if OP1 = OP2, or a negative value if OP1 < OP2.

     Note that `mpz_cmp_ui' and `mpz_cmp_si' are macros and will
     evaluate their arguments more than once.

 - Function: int mpz_cmpabs (mpz_t OP1, mpz_t OP2)
 - Function: int mpz_cmpabs_d (mpz_t OP1, double OP2)
 - Function: int mpz_cmpabs_ui (mpz_t OP1, unsigned long int OP2)
     Compare the absolute values of OP1 and OP2.  Return a positive
     value if abs(OP1) > abs(OP2), zero if abs(OP1) = abs(OP2), or a
     negative value if abs(OP1) < abs(OP2).

     Note that `mpz_cmpabs_si' is a macro and will evaluate its
     arguments more than once.

 - Macro: int mpz_sgn (mpz_t OP)
     Return +1 if OP > 0, 0 if OP = 0, and -1 if OP < 0.

     This function is actually implemented as a macro.  It evaluates
     its argument multiple times.