3_python決策與選擇結構_20201026.ipynb

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      "name": "python3",
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    {
      "cell_type": "markdown",
      "metadata": {
        "id": "view-in-github",
        "colab_type": "text"
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      "source": [
        "<a href=\"https://colab.research.google.com/github/jake0213/python2020/blob/main/3_python%E6%B1%BA%E7%AD%96%E8%88%87%E9%81%B8%E6%93%87%E7%B5%90%E6%A7%8B_20201026.ipynb\" target=\"_parent\"><img src=\"https://colab.research.google.com/assets/colab-badge.svg\" alt=\"Open In Colab\"/></a>"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {
        "id": "-ctfKKFoZXSJ"
      },
      "source": [
        "#鄭竣維在崑山科技大學受恩師龍大大洗禮\n",
        "20201026\n",
        "\n",
        "\n"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {
        "id": "OaJKqW9Dch0Y"
      },
      "source": [
        "# python決策與選擇結構\n",
        "```\n",
        "[1]if\n",
        "[2]if ...elsif\n",
        "[3]if ...else\n",
        "[4]if ...elsif ...else\n",
        "[5]各種判斷條件\n",
        "   AND\n",
        "   OR\n",
        "```\n",
        "```\n",
        "問題:有何差別\n",
        "[2]if ...elsif\n",
        "[3]if ...else\n",
        "```\n",
        "```\n",
        "單向判斷式（if⋯）: 是非題｜對的才要做\n",
        "雙向判斷式（if⋯else）: 二選一｜一定要選的\n",
        "多向判斷式（if⋯elif⋯else）: 多選一｜一定要選的\n",
        "```\n",
        "```\n",
        "程式流程控制　之 選擇(判斷) SELECTION /DECISION\n",
        "Python 程式碼縮排\n",
        "Python 語言以冒號「:」及縮排來表示程式區塊\n",
        "縮排為 1 個 Tab 鍵或 4 個空白鍵\n",
        "https://www.w3schools.com/python/python_conditions.asp\n",
        "```\n",
        "## Python沒有switch\n",
        "```\n",
        "switch(變數名稱或運算式) {\n",
        "    case 符合數字或字元:\n",
        "        陳述句一;\n",
        "        break;\n",
        "    case 符合數字或字元:\n",
        "        陳述句二;\n",
        "        break;\n",
        "    default:\n",
        "        陳述三;\n",
        "        break;\n",
        "}\n",
        "```"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {
        "id": "ATwc25Q2clcb"
      },
      "source": [
        "# [1]if\n",
        "\n",
        "底下程式執行後結果為何?\n",
        "```\n",
        "a = 33\n",
        "b = 200\n",
        "\n",
        "if b > a:\n",
        "  print(\"b is greater than a\")\n",
        "```"
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "vi448YBZaE91",
        "outputId": "b978c4c1-1d42-42a2-ff97-b1c277bfe55c",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 35
        }
      },
      "source": [
        "a = 33\n",
        "b = 200\n",
        " \n",
        "if b > a:\n",
        "  print(\"b is greater than a\")"
      ],
      "execution_count": null,
      "outputs": [
        {
          "output_type": "stream",
          "text": [
            "b is greater than a\n"
          ],
          "name": "stdout"
        }
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {
        "id": "bm4GtzT5cnnj"
      },
      "source": [
        "底下程式執行後結果為何?\n",
        "```\n",
        "a = 33\n",
        "b = 20\n",
        "\n",
        "if b > a:\n",
        "  print(\"b is greater than a\")\n",
        "```"
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "gy8zu6xdaKU1"
      },
      "source": [
        "a = 33\n",
        "b = 20\n",
        " \n",
        "if b > a:\n",
        "  print(\"b is greater than a\")"
      ],
      "execution_count": null,
      "outputs": []
    },
    {
      "cell_type": "markdown",
      "metadata": {
        "id": "S7C9Vh4xcqN4"
      },
      "source": [
        "# [2]if ...elsif\n",
        "\n",
        "底下程式執行後結果為何?\n",
        "```\n",
        "a = 32\n",
        "b = 33\n",
        "\n",
        "if b > a:\n",
        "  print(\"b is greater than a\")\n",
        "elif a == b:\n",
        "  print(\"a and b are equal\")\n",
        "\n",
        "```"
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "tBKywyXcaR-I",
        "outputId": "cbae0f8d-7ef5-41f2-ad6c-dcab09477605",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 35
        }
      },
      "source": [
        "a = 32\n",
        "b = 33\n",
        " \n",
        "if b > a:\n",
        "  print(\"b is greater than a\")\n",
        "elif a == b:\n",
        "  print(\"a and b are equal\")"
      ],
      "execution_count": null,
      "outputs": [
        {
          "output_type": "stream",
          "text": [
            "b is greater than a\n"
          ],
          "name": "stdout"
        }
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {
        "id": "l_euwOcPctBT"
      },
      "source": [
        "底下程式執行後結果為何?\n",
        "```\n",
        "a = 33\n",
        "b = 33\n",
        "if b > a:\n",
        "  print(\"b is greater than a\")\n",
        "elif a == b:\n",
        "  print(\"a and b are equal\")\n",
        "```"
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "H9nV2IA5aVDh",
        "outputId": "3adec420-c4d8-466f-bca8-7caaa7aca8d0",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 35
        }
      },
      "source": [
        "a = 33\n",
        "b = 33\n",
        "if b > a:\n",
        "  print(\"b is greater than a\")\n",
        "elif a == b:\n",
        "  print(\"a and b are equal\")"
      ],
      "execution_count": null,
      "outputs": [
        {
          "output_type": "stream",
          "text": [
            "a and b are equal\n"
          ],
          "name": "stdout"
        }
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {
        "id": "YxeiPkFJcvfa"
      },
      "source": [
        "底下程式執行後結果為何?\n",
        "```\n",
        "a = 35\n",
        "b = 33\n",
        "\n",
        "if b > a:\n",
        "  print(\"b is greater than a\")\n",
        "elif a == b:\n",
        "  print(\"a and b are equal\")\n",
        "```"
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "0CVhjWdwaXOp"
      },
      "source": [
        "a = 35\n",
        "b = 33\n",
        " \n",
        "if b > a:\n",
        "  print(\"b is greater than a\")\n",
        "elif a == b:\n",
        "  print(\"a and b are equal\")"
      ],
      "execution_count": null,
      "outputs": []
    },
    {
      "cell_type": "markdown",
      "metadata": {
        "id": "4v-m5ukFcyUp"
      },
      "source": [
        "# 雙向判斷式（if⋯else）: 二選一｜一定要選的\n",
        "\n",
        "底下程式執行後結果為何?\n",
        "```\n",
        "a = 200\n",
        "b = 33\n",
        "\n",
        "if b > a:\n",
        "  print(\"b is greater than a\")\n",
        "else:\n",
        "  print(\"b is not greater than a\")\n",
        "```"
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "cbKli_wuaa7S",
        "outputId": "698131cf-7b30-4724-b7d3-de765d18fbe6",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 35
        }
      },
      "source": [
        "a = 200\n",
        "b = 33\n",
        " \n",
        "if b > a:\n",
        "  print(\"b is greater than a\")\n",
        "else:\n",
        "  print(\"b is not greater than a\")"
      ],
      "execution_count": null,
      "outputs": [
        {
          "output_type": "stream",
          "text": [
            "b is not greater than a\n"
          ],
          "name": "stdout"
        }
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {
        "id": "7S9Zpdxfc098"
      },
      "source": [
        "# [4]if ...elsif ...else  多選一｜一定要選的\n",
        "\n",
        "底下程式執行後結果為何?\n",
        "```\n",
        "a = 200\n",
        "b = 33\n",
        "\n",
        "if b > a:\n",
        "  print(\"b is greater than a\")\n",
        "elif a == b:\n",
        "  print(\"a and b are equal\")\n",
        "else:\n",
        "  print(\"a is greater than b\")\n",
        "```"
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "8VxwwGFCaezj",
        "outputId": "8572110c-acec-4ad2-80b6-777dda5c55ab",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 35
        }
      },
      "source": [
        "a = 200\n",
        "b = 33\n",
        " \n",
        "if b > a:\n",
        "  print(\"b is greater than a\")\n",
        "elif a == b:\n",
        "  print(\"a and b are equal\")\n",
        "else:\n",
        "  print(\"a is greater than b\")"
      ],
      "execution_count": null,
      "outputs": [
        {
          "output_type": "stream",
          "text": [
            "a is greater than b\n"
          ],
          "name": "stdout"
        }
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {
        "id": "Y1IE6lhfdCql"
      },
      "source": [
        "# [5]各種判斷條件   AND  OR\n",
        "\n",
        "底下程式執行後結果為何?\n",
        "```\n",
        "#判斷是否為閏年\n",
        "\n",
        "year= eval(input(\"請輸入年\"))\n",
        "\n",
        "if ((year%400==0) or (year%4==0 and year%100!=0)):\n",
        "  print(\"{0} 是閏年\".format(year))\n",
        "else:\n",
        "  print(\"{0} 不是閏年\".format(year))\n",
        "```"
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "3MQ6dM91g3g7",
        "outputId": "18b08060-d252-4653-b356-bab210c39380",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 54
        }
      },
      "source": [
        "# 判斷是否為閏年\n",
        " \n",
        "year= eval(input(\"請輸入年\"))\n",
        " \n",
        "if ((year%400==0) or (year%4==0 and year%100!=0)):\n",
        "  print(\"{0} 是閏年\".format(year))\n",
        "else:\n",
        "  print(\"{0} 不是閏年\".format(year))"
      ],
      "execution_count": 38,
      "outputs": [
        {
          "output_type": "stream",
          "text": [
            "請輸入年2004\n",
            "2004 是閏年\n"
          ],
          "name": "stdout"
        }
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {
        "id": "stbXjqM5dKNZ"
      },
      "source": [
        "# 歲月匆匆程式開發\n",
        "```\n",
        "輸入:年月日\n",
        "輸出:已經過了多少日\n",
        "```"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {
        "id": "FdJMoFlmdMwp"
      },
      "source": [
        "底下程式執行後結果為何?\n",
        "```\n",
        "year, month, day = eval(input(\"請輸入年月日\"))\n",
        "year, month, day\n",
        "\n",
        "#請輸入年月日2019,5,22\n",
        "```"
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "Iuqk9Oaga7ML",
        "outputId": "0bd64ef8-b85a-4b81-e3b6-c67df229e1fc",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 54
        }
      },
      "source": [
        "year, month, day = eval(input(\"請輸入年月日\"))\n",
        "year, month, day\n",
        " \n",
        "# 請輸入年月日2019,5,22"
      ],
      "execution_count": null,
      "outputs": [
        {
          "output_type": "stream",
          "text": [
            "請輸入年月日2019,5,22\n"
          ],
          "name": "stdout"
        },
        {
          "output_type": "execute_result",
          "data": {
            "text/plain": [
              "(2019, 5, 22)"
            ]
          },
          "metadata": {
            "tags": []
          },
          "execution_count": 20
        }
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {
        "id": "c1MmiNTIdW_-"
      },
      "source": [
        "底下程式執行後結果為何?\n",
        "```\n",
        "year, month, day = eval(input(\"請輸入年月日::\"))\n",
        "```\n",
        "```\n",
        "day_month = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]\n",
        "\n",
        "if year%400==0 or (year%4==0 and year%100!=0):\t\n",
        "  day_month[1] = 29\n",
        "```\n",
        "```\n",
        "if month==1:\n",
        "    print(day)\n",
        "else:\n",
        "    print(sum(day_month[:month-1])+day)\n",
        "```"
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "2OhHWWvhbOcA",
        "outputId": "4fa8e794-8782-4ff8-f063-2b96d1afb743",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 35
        }
      },
      "source": [
        "if month==1:\n",
        "    print(day)\n",
        "else:\n",
        "    print(sum(day_month[:month-1])+day)"
      ],
      "execution_count": null,
      "outputs": [
        {
          "output_type": "stream",
          "text": [
            "142\n"
          ],
          "name": "stdout"
        }
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "XO1jvvTRbCV3",
        "outputId": "46ed992a-1e11-4526-b4d5-ca8c0a8518fc",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 35
        }
      },
      "source": [
        "year, month, day = eval(input(\"請輸入年月日::\"))"
      ],
      "execution_count": null,
      "outputs": [
        {
          "output_type": "stream",
          "text": [
            "請輸入年月日::2019,5,22\n"
          ],
          "name": "stdout"
        }
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {
        "id": "wfvp-LmZrXLz"
      },
      "source": [
        "\n",
        "# 多向判斷式（if⋯elif⋯else）:收銀台程式開發\n",
        "```\n",
        "百貨公司週年慶活動血拼大打折，\n",
        "吸引很多顧客上門，\n",
        "公司決定再加碼回饋客戶，\n",
        "\n",
        "只要客戶消費\n",
        "金額在 100000 元以上就打八折，\n",
        "金額在 50000 元以上就打八五折，\n",
        "金額在 30000 元以上就打九折，\n",
        "金額在 10000 元以上就打九五折，\n",
        "金額在 10000 元以下就不打折\n",
        "\n",
        "請幫該公司設計這個收銀台的程式，\n",
        "輸入顧客購買金額後，計算顧客應付的金錢。\n",
        "```\n",
        "```\n",
        "money = int(input(\"請輸入購物金額：\"))\n",
        "\n",
        "if(money >= 10000):\n",
        "    if(money >= 100000):\n",
        "        print(money * 0.8, end=\" 元\\n\")  #八折\n",
        "    elif(money >= 50000):\n",
        "        print(money * 0.85, end=\" 元\\n\")  #八五折\n",
        "    elif(money >= 30000):\n",
        "        print(money * 0.9, end=\" 元\\n\")  #九折\n",
        "    else:\n",
        "        print(money * 0.95, end=\" 元\\n\")  #九五折\n",
        "else:\n",
        "    print(money, end=\" 元\\n\")  #未打折\n",
        "```"
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "rsJVR6srbVoz",
        "outputId": "eb662dee-c3a3-41e8-8ed4-07b8ca693870",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 54
        }
      },
      "source": [
        "money = int(input(\"請輸入購物金額：\"))\n",
        " \n",
        "if(money >= 10000):\n",
        "    if(money >= 100000):\n",
        "        print(money * 0.8, end=\" 元\\n\")  #八折\n",
        "    elif(money >= 50000):\n",
        "        print(money * 0.85, end=\" 元\\n\")  #八五折\n",
        "    elif(money >= 30000):\n",
        "        print(money * 0.9, end=\" 元\\n\")  #九折\n",
        "    else:\n",
        "        print(money * 0.95, end=\" 元\\n\")  #九五折\n",
        "else:\n",
        "    print(money, end=\" 元\\n\")  #未打折"
      ],
      "execution_count": null,
      "outputs": [
        {
          "output_type": "stream",
          "text": [
            "請輸入購物金額：1000\n",
            "1000 元\n"
          ],
          "name": "stdout"
        }
      ]
    },
    {
      "cell_type": "code",
      "metadata": {
        "id": "FCEsvSf7bSsh",
        "outputId": "2089cdc5-eaff-4e5a-e75c-d572aa795529",
        "colab": {
          "base_uri": "https://localhost:8080/",
          "height": 135
        }
      },
      "source": [
        "百貨公司週年慶活動血拼大打折，\n",
        "吸引很多顧客上門，\n",
        "公司決定再加碼回饋客戶，\n",
        " \n",
        "只要客戶消費\n",
        "金額在 100000 元以上就打八折，\n",
        "金額在 50000 元以上就打八五折，\n",
        "金額在 30000 元以上就打九折，\n",
        "金額在 10000 元以上就打九五折，\n",
        "金額在 10000 元以下就不打折\n",
        " \n",
        "請幫該公司設計這個收銀台的程式，\n",
        "輸入顧客購買金額後，計算顧客應付的金錢。"
      ],
      "execution_count": null,
      "outputs": [
        {
          "output_type": "error",
          "ename": "SyntaxError",
          "evalue": "ignored",
          "traceback": [
            "\u001b[0;36m  File \u001b[0;32m\"<ipython-input-26-61315a5135cc>\"\u001b[0;36m, line \u001b[0;32m1\u001b[0m\n\u001b[0;31m    百貨公司週年慶活動血拼大打折，\u001b[0m\n\u001b[0m                  ^\u001b[0m\n\u001b[0;31mSyntaxError\u001b[0m\u001b[0;31m:\u001b[0m invalid character in identifier\n"
          ]
        }
      ]
    }
  ]
}