在Shell编程的世界中,while循环是另一个强大的控制结构,与for循环一样,它在自动化任务和脚本编写中扮演着重要角色。while循环的灵活性使其能够处理各种条件控制的任务,从简单的计数器到复杂的逻辑判断,while循环都能提供有效的解决方案。 在这篇文章中,我们将深入探讨Shell脚本中的while循环,了解其基本语法和高级应用。
In Example 1, I’ll show how to create two nestedfor-loops in R. In this example, we are running three iterations of the outer for-loop with theindexi and five iterations of the inner for-loop with the index j. In each iteration we areprintinga sentence to the RStudio console that...
As you can see based on the previous output of the RStudio console, our for-loop returns the sentence “Iteration i was finished.” whenever an iteration runs until the end.Now, let’s implement an if-condition, which sometimes stops the currently running iteration. For this task, we can...
代码语言:python 代码运行次数:0 复制Cloud Studio 代码运行 isBreak = False while condition and not isBreak: # 循环体代码 def button_click(): global isBreak isBreak = True 在上述示例中,condition表示while循环的条件。当按钮被点击时,button_click函数会被调用,将isBreak的值设置为True,从而跳出while循环。
循环结构表 顺序上 应用上 格式 For循环 先判断。在执行。 循环次数确定,通常用for循环。 for(初始化表达式;条件判断;步进语句){ 循环体 } While循环 先判断。在执行。 循环次数不确定,通常用whiler循环。 初始表达式; While(条件判断){ 循环体 步进语句 } Do whlle循环 先执行,在... ...
4.1for循环 参数initial_value代表初始值表达式, loop_condition 代表终止值条件表达式 increament_expression步长表达式。 Statement 1;语句代表执行语句, 在初始值按照步长的规律,不超过终止值时,执行循环体里的语句。 4.2 WHILE 语句 while(条件){ 语句1 语句2 语句n } 当条件为真时,执行循环语句,可以在 Scala wh...
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linux按行读取 (while read line与for-loop) 1. while read line 代码语言:javascript 代码运行次数:0 运行 AI代码解释 whileread line;doecho $line done<test.txt 输出结果与上图一致。 这里也可以写为: 代码语言:javascript 代码运行次数:0 运行
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Visual Studio C++ C++ A high-level, general-purpose programming language, created as an extension of the C programming language, that has object-oriented, generic, and functional features in addition to facilities for low-level memory manipulation. ...