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畅享聊:python的练习题(5)
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Enjoy chatting: Exercises on python (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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