prime number python代码 primes在python 1.题目 2.代码 AI检测代码解析 import os import sys # 请在此输入您的代码 def countPrimes(n): primes=[1]*n count=0 li=[] for i in range(2,n): if primes[i]: count+=1 li.append(i) for j in range(i*i,n,i): primes[j]=0 return count,...
The first few prime numbers are {2, 3, 5, 7, 11, ….}. n = 7 if n>1: for i in range(2, int(n/2)=1): if(n%i)==0: print(n,“ is not a prime number”) break else: print(n,“ is a prime number”) else: print(n,“ is not a prime number”) The output will ...
首先,判断n是否小于等于1,如果是则返回False,因为素数定义中要求大于1。 然后,使用for循环遍历2到n的平方根(使用int(n**0.5)取整加1)之间的所有数。 在循环中,判断n是否能被当前数整除,如果可以,则返回False,因为找到了一个能整除n的数,说明n不是素数。 如果没有找到能整除n的数,则返回True,表示n是素数。
myMode = 'encrypt' # Set to 'encrypt' or 'decrypt'. # If the input file does not exist, the program terminates early: if not os.path.exists(inputFilename): print('The file %s does not exist. Quitting...' % (inputFilename)) sys.exit() # If the output file already exists, give...
Python 中的“For-loop” | | --- | --- | --- | | //让我们初始化一个变量 int I = 3;而(i > 0) {System.out.println("三个 hello ");-我;} | //这是一个迷人的循环for(int I = 0;我<3;i++){控制台。WriteLine(“你好!”);} | #这是一个有趣的循环对于范围(10)内的i:打...
from math import sqrt num = int(input('请输入一个正整数: ')) end = int(sqrt(num)) is_prime = True for x in range(2, end + 1): if num % x == 0: is_prime = False break if is_prime and num != 1: print('%d是素数' % num) else: print('%d不是素数' % num) 2、练习...
# All numbers less than 2 are not prime: if num < 2: return False 第13 行检查num是否小于2,如果是,函数返回False,因为小于 2 的数不能是质数。 第17 行开始了实现试除法算法的for循环。它还使用math.sqrt()得到num的平方根,并使用返回的浮点值来设置我们将测试的整数范围的上限。
# Python program to check prime number# Function to check prime numberdefisPrime(n):returnall([(n%j)forjinrange(2,int(n/2)+1)])andn>1# Main codenum=59ifisPrime(num):print(num,"is a prime number")else:print(num,"is not a prime number")num=7ifisPrime(num):print(num,"is a ...
Here is the complete Python code to print prime numbers from 1 to n in Python. def is_prime(num): if num <= 1: return False for i in range(2, int(num**0.5) + 1): if num % i == 0: return False return True def print_primes(n): ...
Note: A statement in Python is a unit of code. An expression is a special statement that can be evaluated to some value. For example, 1 + 2 is an expression that evaluates to the value 3, while number = 1 + 2 is an assignment statement that doesn’t evaluate to a value. Although...