例如,超过五点下班走人,否则就继续上班。在这里“时间”就是判断条件,时间就是下班或者上班只要时间超过五点,即判断条件为真,则执行的事件就是下班,else语句不再执行,即不再执行上班语句;只要事件没有超过五点,则执行上班语句。2、while是循环语句 在C语言中通常用while来表示循环...
Loops in C is used to execute the block of code several times according to the condition given in the loop. It means it executes the same code multiple times so it saves code and also helps to traverse the elements of an array. There are 3 types of loops in C: while loop in C do...
while是计算机的一种基本循环模式。当满足条件时进入循环,进入循环后,当条件不满足时,跳出循环。while语句的一般表达式为:while(表达式){循环体}。EOF是一个计算机术语,为EndOfFile的缩写,在操作系统中表示资料源无更多的资料可读取。资料源通常称为档案或串流。通常在文本的最后存在此字符表示资料结...
#带else子句的while循环x= float(input("输入x的值:"))# 接收用户输入的数字并转换为float类型i =0while(x!=0):# Python 3中的不等于不再使用<>,一律使用!=if(x>0):x-=1# 如果x大于0,则减1else:x+=1# 如果x小于0,则加1i =...
step2:If the condition returns true then the statements inside the body of while loop are executed else control comes out of the loop. step3:The value of count is incremented using ++ operator then it has been tested again for the loop condition. ...
Esperienza nell'uso delle istruzioni if-elseif-else e switch-case in C# per trovare la corrispondenza per una variabile o un'espressione a fronte di diversi risultati possibili Esperienza nell'uso delle istruzioni foreach e for in C# per scorrere ciclicamente un blocco di codice e accedere ...
#!/bin/bash username=$1 #判断格式参数是否为空 if [ $# -lt 1 ] then echo "Usage:`basename $0` <username> [<message>]" exit 1 fi #判断账号是否存在 if grep "^$username:" /etc/passwd &> /dev/nell;then : else echo "用户不存在" exit 2 fi #判断用户是否在线 until who | grep ...
六、in 和 not in *输入一个数判断这个数是否是质数。 1count = int(input("请输入一个数:"))2i = 23whilecount >0:4ifcount == 1orcount == 2:5print("是质数")6break7ifcount % i !=0:8print("是质数")9break10else:11print("不是质数")12break13i = i + 114else:15print("不是质...
C:\Users\zemuerqi\PycharmProjects\Python2020\venv\Scripts\python.exe C:/Users/zemuerqi/PycharmProjects/Python2020/test.py1-100的和为:5050Process finished with exit code 0 1. for循环 基本语法: for 变量名 in 可迭代对象: 循环体【else: 语句块】 ...
for…in…循环的执行过程:每次循环从集合中取出一个值,并把该值赋值给变量。集合可以是元组、列表、字典等数据结构。其中else子句可以省略。 注意:for循环中的else子句也属于循环的一部分,最后一次循环结束后将执行else子句。 for…in…循环通常与range()函数一起使用,range()返回一个列表,for…in…遍历列表中的元...