畅享聊：Python的练习题（5）

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畅享聊：python的练习题(5)

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题目：判断101-200之间有多少个素数，并输出所有素数。

程序分析：判断素数的方法：用一个数分别去除2到sqrt(这个数)，如果能被整除，则表明此数不是素数，反之是素数。　　　

程序源代码：

Question: Determine how many prime numbers are between 101-200 and output all prime numbers.

Program analysis: the method to determine prime number: use a number to divide 2 to sqrt (this number). If it can be divided by an integer, it indicates that this number is not prime, and vice versa.

Program source code:

输出结果如下：

The output results are as follows:

方法二：

Method 2:

方法三：

Method 3:

最后的输出结果都是一样的。

The final output is the same.

题目：打印出所有的"水仙花数"，所谓"水仙花数"是指一个三位数，其各位数字立方和等于该数本身。例如：153是一个"水仙花数"，因为153=1的三次方＋5的三次方＋3的三次方。

程序分析：利用for循环控制100-999个数，每个数分解出个位，十位，百位。

程序源代码：

Title: Print out all the "narcissus number". The so-called "narcissus number" refers to a three-digit number, and the sum of the cube of each number is equal to the number itself. For example, 153 is a "narcissus number", because 153=the third power of 1+the third power of 5+the third power of 3.

Program analysis: use the for loop to control 100-999 numbers. Each number is decomposed into one, ten, and hundreds.

Program source code:

输出结果如下：

The output results are as follows:

将三位数看成由三个数组成，并判断其各位数字立方和是否等于该数本身

Think of a three-digit number as composed of three numbers, and judge whether the sum of the cubes of its numbers is equal to the number itself

结果如下：

The results are as follows:

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