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### 5.3 Combined Initialization and Assignment Functions

Macro: int mpfr_init_set (mpfr_t rop, mpfr_t op, mpfr_rnd_t rnd)
Macro: int mpfr_init_set_ui (mpfr_t rop, unsigned long int op, mpfr_rnd_t rnd)
Macro: int mpfr_init_set_si (mpfr_t rop, long int op, mpfr_rnd_t rnd)
Macro: int mpfr_init_set_d (mpfr_t rop, double op, mpfr_rnd_t rnd)
Macro: int mpfr_init_set_ld (mpfr_t rop, long double op, mpfr_rnd_t rnd)
Macro: int mpfr_init_set_z (mpfr_t rop, mpz_t op, mpfr_rnd_t rnd)
Macro: int mpfr_init_set_q (mpfr_t rop, mpq_t op, mpfr_rnd_t rnd)
Macro: int mpfr_init_set_f (mpfr_t rop, mpf_t op, mpfr_rnd_t rnd)

  Initialize rop and set its value from op, rounded in the direction rnd. The precision of rop will be taken from the active default precision, as set by `mpfr_set_default_prec`.

Function: int mpfr_init_set_str (mpfr_t x, const char *s, int base, mpfr_rnd_t rnd)

  Initialize x and set its value from the string s in base base, rounded in the direction rnd. See `mpfr_set_str`.