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‎ch_4_while_loops.ipynb

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"metadata": {
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"colab": {
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"provenance": [],
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"authorship_tag": "ABX9TyNvfjEBR+UU23lMYneAQauU",
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"authorship_tag": "ABX9TyPs/xaIgnXS0KLEnKKFfvRH",
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"include_colab_link": true
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},
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"kernelspec": {
@@ -40,25 +40,328 @@
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{
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"cell_type": "code",
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"source": [
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"# we can not brute force the code to repeat a programming statement.\n",
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"# we got to be smarter in doing the repititions.\n",
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"print(\"testing\")\n",
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"print(\"testing\")\n",
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"print(\"testing\")\n",
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"print(\"testing\")\n",
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"print(\"testing\")\n",
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"print(\"testing\")\n",
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"print(\"testing\")\n",
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"print(\"testing\")\n",
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"print(\"testing\")\n",
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"print(\"testing\")\n",
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"print(\"testing\")\n",
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"print(\"testing\")"
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],
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"metadata": {
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"colab": {
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"base_uri": "https://localhost:8080/"
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},
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"id": "JAo-WnV7DQmr",
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"outputId": "393c1a56-8062-4685-a7d3-d0348b7217de"
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"outputId": "d4da6011-0801-4b27-b138-2f0cbdfb0bd4"
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},
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"execution_count": 3,
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"execution_count": 4,
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"outputs": [
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{
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"output_type": "stream",
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"name": "stdout",
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"text": [
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"testing\n",
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"testing\n",
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"testing\n",
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"testing\n",
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"testing\n",
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"testing\n",
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"testing\n",
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"testing\n",
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"testing\n",
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"testing\n",
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"testing\n",
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"testing\n"
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]
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}
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]
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},
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{
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"cell_type": "code",
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"source": [
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"# Basic example of while loop\n",
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"n = 5\n",
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"while (n > 0) :\n",
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" print(n)\n",
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" n = n-1\n",
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"print(\"Take Off!\")\n",
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"print(n)"
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],
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"metadata": {
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"colab": {
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"base_uri": "https://localhost:8080/"
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},
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"id": "HSbSycexG7IK",
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"outputId": "bc3028b6-a1ca-4c4e-c18d-adf9529b1bf4"
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},
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"execution_count": 5,
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"outputs": [
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{
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"output_type": "stream",
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"name": "stdout",
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"text": [
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"5\n",
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"4\n",
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"3\n",
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"2\n",
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"1\n",
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"Take Off!\n",
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"0\n"
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]
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}
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]
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},
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{
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"cell_type": "markdown",
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"source": [
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"### 4.1 The Bug Collector Problem\n",
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"A bug collector collects bugs every day for five days. Write a program that keeps a running total\n",
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"of the number of bugs collected during the five days. The loop should ask for the number of\n",
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"bugs collected for each day, and when the loop is finished, the program should display the total\n",
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"number of bugs collected."
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],
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"metadata": {
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"id": "3HVcaXirKiMs"
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}
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},
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{
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"cell_type": "code",
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"source": [
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"day_count = 1\n",
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"total_bugs = 0\n",
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"\n",
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"# while (day_count < 6): # ok\n",
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"# while (day_count <= 5): # ok\n",
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"# while (day_count < 5): # not ok; One-off defect\n",
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" \n",
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"while (day_count <= 5): \n",
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" print(\"Day Number: \", day_count)\n",
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" bug_count = input(\"Enter the bugs you collected: \")\n",
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" bug_count = int(bug_count)\n",
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" total_bugs = total_bugs + bug_count\n",
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" day_count = day_count + 1\n",
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" \n",
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"# output\n",
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"print(\"Total number of bugs collected: \", total_bugs)"
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],
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"metadata": {
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"id": "OGEHZllNKhiU"
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},
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"execution_count": null,
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"outputs": []
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},
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{
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"cell_type": "code",
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"source": [
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"# With minor enhancement\n",
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"# FInal version for programming assignment 2.1\n",
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"day_count = 1\n",
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"total_bugs = 0\n",
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"\n",
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"# while (day_count < 6): # ok\n",
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"# while (day_count <= 5): # ok\n",
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"# while (day_count < 5): # not ok; One-off defect\n",
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" \n",
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"while (day_count <= 5): \n",
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" #print(\"Day Number: \", day_count)\n",
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" bug_count = input(\"Enter the bugs you collected on day \" + str(day_count) + \": \")\n",
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" bug_count = int(bug_count)\n",
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" total_bugs = total_bugs + bug_count\n",
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" day_count = day_count + 1\n",
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" \n",
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"# output\n",
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"print(\"Total number of bugs collected: \", total_bugs)"
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],
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"metadata": {
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"id": "grCtpF80Nh90"
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},
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"execution_count": null,
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"outputs": []
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},
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{
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"cell_type": "markdown",
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"source": [
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"### 4.2. Calories Burned\n",
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"Running on a particular treadmill you burn 4.2 calories per minute. Write a program that uses a\n",
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"loop to display the number of calories burned after 10, 15, 20, 25, and 30 minutes."
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],
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"metadata": {
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"id": "HVzZrxAmPGFG"
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}
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},
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{
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"cell_type": "code",
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"source": [
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"# declare and initialize variables\n",
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"CAL_PER_MINUTE = 4.2\n",
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"starting_minute = 10\n",
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"\n",
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"# setup for loop\n",
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"while (starting_minute < 31):\n",
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" calories_burned = starting_minute * CAL_PER_MINUTE\n",
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" print(\"Number of calories burned after\", starting_minute, \"minutes: \", calories_burned)\n",
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" starting_minute = starting_minute + 5\n",
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"\n",
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"# output\n",
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"print(\"Done!\")\n",
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"\n"
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],
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"metadata": {
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"id": "whepmowLPSk4"
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},
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"execution_count": null,
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"outputs": []
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},
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{
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"cell_type": "markdown",
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"source": [
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"Number of calories burned after 10 minutes: 42.0\n",
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"Number of calories burned after 15 minutes: 63.0\n",
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"Number of calories burned after 20 minutes: 84.0\n",
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"Number of calories burned after 25 minutes: 105.0\n",
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"Number of calories burned after 30 minutes: 126.0\n",
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"Done!\n",
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"\n",
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"===============>\n",
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"\n",
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"Minutes Calories\n",
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"10 42.0\n",
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"15 63.0\n",
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"20 84.0\n",
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"25 105.0\n",
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"30 126.0"
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],
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"metadata": {
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"id": "2b43Zt64QVQg"
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}
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},
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{
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"cell_type": "code",
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"source": [
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"# declare and initialize variables\n",
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"CAL_PER_MINUTE = 4.2\n",
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"starting_minute = 10\n",
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"\n",
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"# setup for loop\n",
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"while (starting_minute < 31):\n",
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" calories_burned = starting_minute * CAL_PER_MINUTE\n",
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" print(\"Number of calories burned after\", starting_minute, \"minutes: \", calories_burned)\n",
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" starting_minute = starting_minute + 5\n",
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"\n",
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"# output\n",
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"print(\"Done!\")\n",
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"\n"
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],
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"metadata": {
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"id": "jHILbJLVQRBn"
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},
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"execution_count": null,
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"outputs": []
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},
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{
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"cell_type": "code",
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"source": [
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"# declare and initialize variables\n",
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"CAL_PER_MINUTE = 4.2\n",
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"starting_minute = 10\n",
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"\n",
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"# setup for loop\n",
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"print(\"Minutes Calories\")\n",
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"while (starting_minute < 31):\n",
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" calories_burned = starting_minute * CAL_PER_MINUTE\n",
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" print(starting_minute, \" \", calories_burned)\n",
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" starting_minute = starting_minute + 5\n",
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"\n",
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"# output\n",
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"print(\"Done!\")"
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],
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"metadata": {
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"id": "JJ6rovNIQ6_B"
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},
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"execution_count": null,
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"outputs": []
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},
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{
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"cell_type": "markdown",
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"source": [
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"### 4.7. Pennies for Pay\n",
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"Write a program that calculates the amount of money a person would earn over a period of time\n",
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"if his or her salary is one penny the first day, two pennies the second day, and continues to\n",
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"double each day. The program should ask the user for the number of days. Display a table\n",
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"showing what the salary was for each day, then show the total pay at the end of the period. The\n",
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"output should be displayed in a dollar amount, not the number of pennies.\n"
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],
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"metadata": {
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"id": "BczU85UOPPia"
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}
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},
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{
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"cell_type": "code",
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"source": [
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"# get the input from the user\n",
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"max_day = input(\"Enter the number of days: \")\n",
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"max_day = int(max_day)\n",
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"\n",
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"\n",
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"# initialize the variables\n",
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"day_num = 1 # we need this to check the loop condition\n",
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"pay_for_the_day = 1 # for keeping track of the pay for a given day\n",
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"total_pay = 0 # need this to print the final output\n",
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"\n",
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"# setup the while loop\n",
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"while (day_num <= max_day):\n",
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" if day_num == 1 :\n",
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" pay_for_the_day = 1 \n",
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" else :\n",
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" pay_for_the_day = pay_for_the_day * 2\n",
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" print('day', day_num, ' = ' , pay_for_the_day, ' pennies')\n",
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" \n",
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" day_num = day_num + 1\n",
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" total_pay = total_pay + pay_for_the_day\n",
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" \n",
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"# print the final output\n",
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"print('The total pay in pennies' , total_pay)\n",
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"print('The total pay in dollars' , total_pay/100)"
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],
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"metadata": {
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"colab": {
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"base_uri": "https://localhost:8080/"
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},
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"id": "L_GYD0KtSN0d",
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"outputId": "d43be66c-59b3-4bd3-9e47-7222ee0dcaea"
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},
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"execution_count": 8,
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"outputs": [
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{
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"output_type": "stream",
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"name": "stdout",
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"text": [
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"Enter the number of days: 5\n",
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"day 1 = 1 pennies\n",
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"day 2 = 2 pennies\n",
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"day 3 = 4 pennies\n",
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"day 4 = 8 pennies\n",
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"day 5 = 16 pennies\n",
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"The total pay in pennies 31\n",
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"The total pay in dollars 0.31\n"
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]
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}
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]
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},
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{
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"cell_type": "markdown",
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"source": [],
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"metadata": {
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"id": "zfm8_kq3KcYY"
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}
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}
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]
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}

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