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There are six classes of functions in the GMP library:

- Functions for signed integer arithmetic, with names beginning with
`mpz_`

. The associated type is`mpz_t`

. There are about 150 functions in this class. (see Integer Functions) - Functions for rational number arithmetic, with names beginning with
`mpq_`

. The associated type is`mpq_t`

. There are about 35 functions in this class, but the integer functions can be used for arithmetic on the numerator and denominator separately. (see Rational Number Functions) - Functions for floating-point arithmetic, with names beginning with
`mpf_`

. The associated type is`mpf_t`

. There are about 70 functions is this class. (see Floating-point Functions) - Fast low-level functions that operate on natural numbers. These are used by
the functions in the preceding groups, and you can also call them directly
from very time-critical user programs. These functions’ names begin with
`mpn_`

. The associated type is array of`mp_limb_t`

. There are about 60 (hard-to-use) functions in this class. (see Low-level Functions) - Miscellaneous functions. Functions for setting up custom allocation and functions for generating random numbers. (see Custom Allocation, and see Random Number Functions)