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‎maymee/Ex4_Looping.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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"id": "view-in-github",
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"colab_type": "text"
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},
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"source": [
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"<a href=\"https://colab.research.google.com/github/Maymee614/PythonProgramming/blob/main/maymee/Ex4_Looping.ipynb\" target=\"_parent\"><img src=\"https://colab.research.google.com/assets/colab-badge.svg\" alt=\"Open In Colab\"/></a>"
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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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"id": "YeTHwB3EASGn"
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},
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"source": [
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"The exercises are extracted from A_Practical_Introduction_to_Python_Programming_Heinold.pdf"
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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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"id": "wVOW5QDgAZ_R"
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},
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"source": [
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"Ex 1: Write a program that uses a while loop (not a for loop) to read through a string and print\n",
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"the characters of the string one-by-one on separate lines."
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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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"id": "77KGqP-sJJNh"
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},
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"outputs": [],
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"source": [
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" text = \"may\"\n",
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" i = 0\n",
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" while i < len(text):\n",
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" print(text[i])\n",
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" i += 1"
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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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"id": "5B-LyYV0AkCK"
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},
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"source": [
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"Ex 2: A good program will make sure that the data its users enter is valid. Write a program that\n",
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"asks the user for a weight and converts it from kilograms to pounds. Whenever the user\n",
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"enters a weight below 0, the program should tell them that their entry is invalid and then ask\n",
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"them again to enter a weight. [Hint: Use a while loop, not an if statement]."
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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": 1,
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"metadata": {
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"id": "gpRZnsXjArkF",
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"outputId": "3ec98764-090d-4330-da69-dd0f3e059558",
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"colab": {
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"base_uri": "https://localhost:8080/"
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}
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},
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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 weight in kilograms: 45\n",
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"weight in puntds: 99.208\n"
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]
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}
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],
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"source": [
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"weight_kg=-1\n",
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"while weight_kg < 0:\n",
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" weight_kg = float(input(\"enter weight in kilograms: \"))\n",
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" if weight_kg<0:\n",
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" print(\"Invalid Input: please Try again\")\n",
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" else:\n",
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" weight_lb = weight_kg * 2.20462\n",
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"print(f\"weight in puntds: {weight_lb: .3f}\")\n"
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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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"id": "zQT0pCjRAsIK"
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},
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"source": [
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"Ex 3: Write a program that allows the user to enter any number of test scores. The user indicates\n",
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"they are done by entering in a negative number. Print how many of the scores are A’s (90 or\n",
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"above). Also print out the average"
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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": 2,
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"metadata": {
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"id": "Gya-rvYUAviK",
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"outputId": "ede2eb7d-bdc7-4063-dae0-884256e50e67",
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"colab": {
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"base_uri": "https://localhost:8080/"
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}
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},
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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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"Please enter a number :91\n",
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"Please enter a number :-45\n",
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"the number of score that get A plus : 1\n",
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"the average score : 23.0\n"
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]
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}
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],
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"source": [
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"score=1\n",
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"Aplus_count=0\n",
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"total_score=0\n",
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"count_score=0\n",
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"while score>0 :\n",
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" score=int(input(\"Please enter a number :\"))\n",
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" if score>=90:\n",
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" Aplus_count=Aplus_count+1\n",
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" total_score=total_score+score\n",
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" count_score=count_score+1\n",
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"print(\"the number of score that get A plus : \", Aplus_count)\n",
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"print(\"the average score : \", total_score/count_score)"
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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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"id": "IHIWc5jHAwxY"
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},
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"source": [
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"Ex 4: Write a program that asks the user for a string and a letter. Using a for loop, the\n",
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"program should print the index of the first occurrence of that letter and a message if the\n",
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"string does not contain the letter."
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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": 3,
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"metadata": {
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"id": "xSe0mtQ8A68M",
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"outputId": "3d8e7257-53f7-41ab-be0e-9ab87f1fdcbd",
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"colab": {
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"base_uri": "https://localhost:8080/"
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}
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},
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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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"Please enter an string of text: hello\n",
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"A letter to search the first occurance for: e\n",
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"letter found at index1\n"
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]
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}
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],
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"source": [
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"text = input(\"Please enter an string of text: \")\n",
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"letter = input(\"A letter to search the first occurance for: \")\n",
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"found_index=-1\n",
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"for index,char in enumerate(text):\n",
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" if char == letter:\n",
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" found_index=index\n",
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" break\n",
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"if found_index == -1:\n",
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" print(\"letter not found\")\n",
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"else:\n",
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" print(f\"letter found at index{index}\")"
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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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"id": "PfyUq4CnA8vk"
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},
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"source": [
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"Ex 5: Write a program in which you have a list that contains seven integers that can be 0 or 1. Find the first zero entry in the list and change it to a 1. If there are no zero entries, print a message saying so."
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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": 4,
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"metadata": {
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"id": "9JuJNAwB2RXT",
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"outputId": "c85b5e45-808a-4418-c259-17291298c0a3",
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"colab": {
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"base_uri": "https://localhost:8080/"
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}
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},
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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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"Updated list: [1, 1, 1, 1, 1, 1, 0]\n"
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]
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}
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],
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"source": [
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"binary_list = [1,0,1,1,1,1,0]\n",
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"i = 0\n",
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"found = False\n",
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"while i < len(binary_list):\n",
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" if binary_list[i] == 0:\n",
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" binary_list[i] = 1\n",
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"\n",
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" found = True\n",
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" break\n",
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" i += 1\n",
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"print(\"Updated list: \", binary_list)"
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]
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}
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],
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"metadata": {
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"colab": {
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"name": "Ex4_Looping.ipynb",
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"provenance": [],
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"include_colab_link": true
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},
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"kernelspec": {
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"display_name": "Python 3",
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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": "3.12.1"
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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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