| mpfr_libmpfr_get_z_2exp Method |
Put the scaled significand of op (regarded as an integer, with the precision of op) into rop, and return the exponent exp (which may be outside the current exponent range) such that op = rop * 2^exp.
Namespace: Math.Mpfr.Native
Assembly: Math.Mpfr.Native (in Math.Mpfr.Native.dll) Version: 1.0.0.0 (1.0.0.0)
SyntaxParameters
- rop
- Type: Math.Gmp.Nativempz_t
The result floating-point number. - op
- Type: Math.Mpfr.Nativempfr_t
The operand floating-point number.
Return Value
Type: mpfr_exp_tReturn the exponent exp (which may be outside the current exponent range) such that op = rop * 2^exp.
RemarksIf op is zero, the minimal exponent emin is returned. If op is NaN or an infinity, the erange flag is set, rop is set to 0, and the the minimal exponent emin is returned. The returned exponent may be less than the minimal exponent emin of MPFR numbers in the current exponent range; in case the exponent is not representable in the mpfr_exp_t type, the erange flag is set and the minimal value of the mpfr_exp_t type is returned.
Examples// Create, initialize, and set a new floating-point number op to 8. mpfr_t op = new mpfr_t(); mpfr_lib.mpfr_init2(op, 64U); Assert.IsTrue(mpfr_lib.mpfr_set_d(op, 8, mpfr_rnd_t.MPFR_RNDN) == 0); // Create and initialize a new integer rop. mpz_t rop = new mpz_t(); gmp_lib.mpz_init(rop); // Set rop such that op = rop * 2^exp. mpfr_exp_t exp = mpfr_lib.mpfr_get_z_2exp(rop, op); // Assert rop and exp. Assert.IsTrue(rop.ToString() == "9223372036854775808" && exp == -60); // Release unmanaged memory allocated for rop and op. gmp_lib.mpz_clear(rop); mpfr_lib.mpfr_clear(op);
See Also