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https://github.com/donnemartin/interactive-coding-challenges
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Add bit challenge
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Donne Martin
225
bit_manipulation/bit/bit_challenge.ipynb
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225
bit_manipulation/bit/bit_challenge.ipynb
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{
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"cells": [
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"This notebook was prepared by [Donne Martin](https://github.com/donnemartin). Source and license info is on [GitHub](https://github.com/donnemartin/interactive-coding-challenges)."
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"# Challenge Notebook"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"## Problem: Implement common bit manipulation operations: get_bit, set_bit, clear_bit, clear_bits_msb_to_index, clear_bits_msb_to_lsb, update_bit.\n",
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"\n",
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"* [Constraints](#Constraints)\n",
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"* [Test Cases](#Test-Cases)\n",
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"* [Algorithm](#Algorithm)\n",
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"* [Code](#Code)\n",
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"* [Unit Test](#Unit-Test)\n",
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"* [Solution Notebook](#Solution-Notebook)"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"## Constraints\n",
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"\n",
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"* Can we assume the inputs are valid?\n",
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" * No\n",
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"* Can we assume this fits memory?\n",
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" * Yes"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"## Test Cases\n",
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"\n",
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"* None as a number input -> Exception\n",
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"* Negative index -> Exception\n",
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"\n",
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"### get_bit\n",
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" number = 0b10001110, index = 3\n",
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" expected = True\n",
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"### set_bit\n",
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" number = 0b10001110, index = 4\n",
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" expected = 0b10011110\n",
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"### clear_bit\n",
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" number = 0b10001110, index = 3\n",
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" expected = 0b10000110\n",
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"### clear_bits_msb_to_index\n",
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" number = 0b10001110, index = 3\n",
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" expected = 0b00000110\n",
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"### clear_bits_index_to_lsb\n",
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" number = 0b10001110, index = 3\n",
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" expected = 0b10000000\n",
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"### update_bit\n",
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" number = 0b10001110, index = 3, value = 1\n",
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" expected = 0b10001110\n",
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" number = 0b10001110, index = 3, value = 0\n",
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" expected = 0b10000110\n",
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" number = 0b10001110, index = 0, value = 1\n",
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" expected = 0b10001111"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"## Algorithm\n",
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"\n",
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"Refer to the [Solution Notebook](). If you are stuck and need a hint, the solution notebook's algorithm discussion might be a good place to start."
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"## Code"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {
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"collapsed": false
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},
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"outputs": [],
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"source": [
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"class Bit(object):\n",
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"\n",
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" def __init__(self, number):\n",
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" # TODO: Implement me\n",
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" pass\n",
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"\n",
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" def get_bit(self, index):\n",
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" # TODO: Implement me\n",
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" pass\n",
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"\n",
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" def set_bit(self, index):\n",
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" # TODO: Implement me\n",
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" pass\n",
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"\n",
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" def clear_bit(self, index):\n",
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" # TODO: Implement me\n",
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" pass\n",
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"\n",
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" def clear_bits_msb_to_index(self, index):\n",
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" # TODO: Implement me\n",
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" pass\n",
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"\n",
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" def clear_bits_index_to_lsb(self, index):\n",
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" # TODO: Implement me\n",
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" pass\n",
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"\n",
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" def update_bit(self, index, value):\n",
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" # TODO: Implement me\n",
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" pass"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"## Unit Test"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"**The following unit test is expected to fail until you solve the challenge.**"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {
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"collapsed": false
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},
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"outputs": [],
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"source": [
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"# %load test_bit.py\n",
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"from nose.tools import assert_equal\n",
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"\n",
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"\n",
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"class TestBit(object):\n",
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"\n",
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" def test_bit(self):\n",
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" number = int('10001110', base=2)\n",
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" bit = Bit(number)\n",
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" assert_equal(bit.get_bit(index=3), True)\n",
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" expected = int('10011110', base=2)\n",
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" assert_equal(bit.set_bit(index=4), expected)\n",
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" bit = Bit(number)\n",
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" expected = int('10000110', base=2)\n",
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" assert_equal(bit.clear_bit(index=3), expected)\n",
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" bit = Bit(number)\n",
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" expected = int('00000110', base=2)\n",
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" assert_equal(bit.clear_bits_msb_to_index(index=3), expected)\n",
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" bit = Bit(number)\n",
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" expected = int('10000000', base=2)\n",
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" assert_equal(bit.clear_bits_index_to_lsb(index=3), expected)\n",
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" bit = Bit(number)\n",
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" assert_equal(bit.update_bit(index=3, value=1), number)\n",
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" bit = Bit(number)\n",
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" expected = int('10000110', base=2)\n",
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" assert_equal(bit.update_bit(index=3, value=0), expected)\n",
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" bit = Bit(number)\n",
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" expected = int('10001111', base=2)\n",
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" assert_equal(bit.update_bit(index=0, value=1), expected)\n",
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" print('Success: test_bit')\n",
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"\n",
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"\n",
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"def main():\n",
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" test = TestBit()\n",
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" test.test_bit()\n",
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"\n",
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"\n",
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"if __name__ == '__main__':\n",
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" main()"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"## Solution Notebook\n",
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"\n",
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"Review the [Solution Notebook]() for a discussion on algorithms and code solutions."
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]
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}
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],
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"metadata": {
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"kernelspec": {
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"display_name": "Python 3",
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"language": "python",
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"name": "python3"
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},
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"language_info": {
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"codemirror_mode": {
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"name": "ipython",
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"version": 3
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},
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"file_extension": ".py",
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"mimetype": "text/x-python",
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"name": "python",
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"nbconvert_exporter": "python",
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"pygments_lexer": "ipython3",
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"version": "3.5.0"
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}
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},
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"nbformat": 4,
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"nbformat_minor": 0
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}
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