Assigning Integers (GNU MP 6.2.1)
Description: How to install and use the GNU multiple precision arithmetic library, version 6.2.1.

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### 5.2 Assignment Functions

These functions assign new values to already initialized integers (see Initializing Integers).

Function: void mpz_set (mpz_t rop, const mpz_t op)
Function: void mpz_set_ui (mpz_t rop, unsigned long int op)
Function: void mpz_set_si (mpz_t rop, signed long int op)
Function: void mpz_set_d (mpz_t rop, double op)
Function: void mpz_set_q (mpz_t rop, const mpq_t op)
Function: void mpz_set_f (mpz_t rop, const mpf_t op)

  Set the value of rop from op.

  `mpz_set_d`, `mpz_set_q` and `mpz_set_f` truncate op to make it an integer.

Function: int mpz_set_str (mpz_t rop, const char *str, int base)

  Set the value of rop from str, a null-terminated C string in base base. White space is allowed in the string, and is simply ignored.

  The base may vary from 2 to 62, or if base is 0, then the leading characters are used: `0x` and `0X` for hexadecimal, `0b` and `0B` for binary, `0` for octal, or decimal otherwise.

  For bases up to 36, case is ignored; upper-case and lower-case letters have the same value. For bases 37 to 62, upper-case letter represent the usual 10..35 while lower-case letter represent 36..61.

  This function returns 0 if the entire string is a valid number in base base. Otherwise it returns -1.

Function: void mpz_swap (mpz_t rop1, mpz_t rop2)

  Swap the values rop1 and rop2 efficiently.