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                # Python 程序:使用遞歸查找自然數之和 > 原文: [https://www.programiz.com/python-programming/examples/natural-number-recursion](https://www.programiz.com/python-programming/examples/natural-number-recursion) #### 在此程序中,您將學習使用遞歸函數查找自然數之和。 要理解此示例,您應該了解以下 [Python 編程](/python-programming "Python tutorial")主題: * [Python `if...else`語句](/python-programming/if-elif-else) * [Python 函數](/python-programming/function) * [Python 遞歸](/python-programming/recursion) * * * 在下面的程序中,我們使用了遞歸函數`recur_sum()`計算得出給定數字的總和。 ## 源代碼 ```py # Python program to find the sum of natural using recursive function def recur_sum(n): if n <= 1: return n else: return n + recur_sum(n-1) # change this value for a different result num = 16 if num < 0: print("Enter a positive number") else: print("The sum is",recur_sum(num)) ``` **輸出** ```py The sum is 136 ``` **注意**:要測試程序的另一個數字,請更改`num`的值。
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