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GNU MP 4.1.2

5.7 Exponentiation Functions

Function: void mpz_powm (mpz_t rop, mpz_t base, mpz_t exp, mpz_t mod)

Function: void mpz_powm_ui (mpz_t rop, mpz_t base, unsigned long int exp, mpz_t mod)

Set rop to \N\ \bmod mod, (base raised to exp) modulo mod}.

Negative exp is supported if an inverse base^-1 mod mod exists (see mpz_invert in 5.9 Number Theoretic Functions). If an inverse doesn't exist then a divide by zero is raised.

Function: void mpz_pow_ui (mpz_t rop, mpz_t base, unsigned long int exp)

Function: void mpz_ui_pow_ui (mpz_t rop, unsigned long int base, unsigned long int exp)

Set rop to \N\, base raised to exp}. The case 0^0 yields 1.