Module malachite_nz::natural::arithmetic::shl_round

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Expand description

Implementations of ShlRound and ShlRoundAssign, traits for multiplying a number by a power of 2 and rounding according to a specified RoundingMode.

shl_round

extern crate malachite_base;

use malachite_base::rounding_modes::RoundingMode;
use malachite_base::num::arithmetic::traits::ShlRound;
use malachite_base::num::basic::traits::Zero;
use malachite_nz::natural::Natural;

assert_eq!(Natural::from(0x101u32).shl_round(-8i8, RoundingMode::Down), 1);
assert_eq!(Natural::from(0x101u32).shl_round(-8i16, RoundingMode::Up), 2);
assert_eq!(Natural::from(0x101u32).shl_round(-9i32, RoundingMode::Down), 0);
assert_eq!(Natural::from(0x101u32).shl_round(-9i64, RoundingMode::Up), 1);
assert_eq!(Natural::from(0x101u32).shl_round(-9i8, RoundingMode::Nearest), 1);
assert_eq!(Natural::from(0xffu32).shl_round(-9i16, RoundingMode::Nearest), 0);
assert_eq!(Natural::from(0x100u32).shl_round(-9i32, RoundingMode::Nearest), 0);
assert_eq!(Natural::from(0x100u32).shl_round(-8i64, RoundingMode::Exact), 1);
assert_eq!(Natural::ZERO.shl_round(10i8, RoundingMode::Exact), 0);
assert_eq!(Natural::from(123u32).shl_round(2i16, RoundingMode::Exact), 492);
assert_eq!(
    Natural::from(123u32).shl_round(100i32, RoundingMode::Exact).to_string(),
    "155921023828072216384094494261248"
);

assert_eq!((&Natural::from(0x101u32)).shl_round(-8i8, RoundingMode::Down), 1);
assert_eq!((&Natural::from(0x101u32)).shl_round(-8i16, RoundingMode::Up), 2);
assert_eq!((&Natural::from(0x101u32)).shl_round(-9i32, RoundingMode::Down), 0);
assert_eq!((&Natural::from(0x101u32)).shl_round(-9i64, RoundingMode::Up), 1);
assert_eq!((&Natural::from(0x101u32)).shl_round(-9i8, RoundingMode::Nearest), 1);
assert_eq!((&Natural::from(0xffu32)).shl_round(-9i16, RoundingMode::Nearest), 0);
assert_eq!((&Natural::from(0x100u32)).shl_round(-9i32, RoundingMode::Nearest), 0);
assert_eq!((&Natural::from(0x100u32)).shl_round(-8i64, RoundingMode::Exact), 1);
assert_eq!((&Natural::ZERO).shl_round(10i8, RoundingMode::Exact), 0);
assert_eq!((&Natural::from(123u32)).shl_round(2i16, RoundingMode::Exact), 492);
assert_eq!(
    (&Natural::from(123u32)).shl_round(100i32, RoundingMode::Exact).to_string(),
    "155921023828072216384094494261248"
);

shl_round_assign

extern crate malachite_base;

use malachite_base::rounding_modes::RoundingMode;
use malachite_base::num::arithmetic::traits::ShlRoundAssign;
use malachite_base::num::basic::traits::One;
use malachite_nz::natural::Natural;

let mut n = Natural::from(0x101u32);
n.shl_round_assign(-8i8, RoundingMode::Down);
assert_eq!(n, 1);

let mut n = Natural::from(0x101u32);
n.shl_round_assign(-8i16, RoundingMode::Up);
assert_eq!(n, 2);

let mut n = Natural::from(0x101u32);
n.shl_round_assign(-9i32, RoundingMode::Down);
assert_eq!(n, 0);

let mut n = Natural::from(0x101u32);
n.shl_round_assign(-9i64, RoundingMode::Up);
assert_eq!(n, 1);

let mut n = Natural::from(0x101u32);
n.shl_round_assign(-9i8, RoundingMode::Nearest);
assert_eq!(n, 1);

let mut n = Natural::from(0xffu32);
n.shl_round_assign(-9i16, RoundingMode::Nearest);
assert_eq!(n, 0);

let mut n = Natural::from(0x100u32);
n.shl_round_assign(-9i32, RoundingMode::Nearest);
assert_eq!(n, 0);

let mut n = Natural::from(0x100u32);
n.shl_round_assign(-8i64, RoundingMode::Exact);
assert_eq!(n, 1);

let mut x = Natural::ONE;
x.shl_round_assign(1i8, RoundingMode::Exact);
x.shl_round_assign(2i16, RoundingMode::Exact);
x.shl_round_assign(3i32, RoundingMode::Exact);
x.shl_round_assign(4i64, RoundingMode::Exact);
assert_eq!(x, 1024);