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                # Python 程序:制作一個簡單的計算器 > 原文: [https://www.programiz.com/python-programming/examples/calculator](https://www.programiz.com/python-programming/examples/calculator) #### 在此示例中,您將學習創建一個簡單的計算器,該計算器可以根據用戶的輸入進行加,減,乘或除。 要理解此示例,您應該了解以下 [Python 編程](/python-programming "Python tutorial")主題: * [Python 函數](/python-programming/function) * [Python 函數參數](/python-programming/function-argument) * [Python 用戶定義函數](/python-programming/user-defined-function) * * * ## 示例:使用函數的簡單計算器 ```py # Program make a simple calculator # This function adds two numbers def add(x, y): return x + y # This function subtracts two numbers def subtract(x, y): return x - y # This function multiplies two numbers def multiply(x, y): return x * y # This function divides two numbers def divide(x, y): return x / y print("Select operation.") print("1.Add") print("2.Subtract") print("3.Multiply") print("4.Divide") while True: # Take input from the user choice = input("Enter choice(1/2/3/4): ") # Check if choice is one of the four options if choice in ('1', '2', '3', '4'): num1 = float(input("Enter first number: ")) num2 = float(input("Enter second number: ")) if choice == '1': print(num1, "+", num2, "=", add(num1, num2)) elif choice == '2': print(num1, "-", num2, "=", subtract(num1, num2)) elif choice == '3': print(num1, "*", num2, "=", multiply(num1, num2)) elif choice == '4': print(num1, "/", num2, "=", divide(num1, num2)) break else: print("Invalid Input") ``` **輸出** ```py Select operation. 1.Add 2.Subtract 3.Multiply 4.Divide Enter choice(1/2/3/4): 3 Enter first number: 15 Enter second number: 14 15.0 * 14.0 = 210.0 ``` 在此程序中,我們要求用戶選擇一個操作。 選項 1、2、3 和 4 有效。 如果給出任何其他輸入,則顯示無效輸入,循環繼續進行,直到選擇了有效選項為止。 取兩個數字,并使用`if...elif...else`分支執行特定節。 用戶定義的函數`add()`,`subtract()`,`multiply()`和`divide()`求值各自的操作并顯示輸出。
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