while循环和for循环都是先判断表达式，后执行循环体（本质上没太大差别）；而do while循环是先执行循环...
百度试题 结果1 题目For语句与Do…Loop语句有何异同?相关知识点: 试题来源: 解析 答:For语句适合处理能计算出循环的循环,且步长固定;而Do…Loop可以处理任何种类的循环,所有用For语句能实现的循环都可以用Do…Loop来实现,反之则较为困难。反馈 收藏
需要注意的是个模型仅可使用一个迭代器。如果模型中已经存在一个迭代器,那么就没办法再添加迭代器了,只能嵌套一个子模型,在子模型里使用。 ? ?...ModelBuilder提供了四个大类,十二种迭代,在之后的文章中我会依次讲到,这次讲前两个,For循环和While 循环,本质上和编程
Do While...Loop:先判断条件,再执行循环体。 vb Do While condition ' 循环体 Loop Do...Loop While:先执行循环体,再判断条件。 vb Do ' 循环体 Loop While condition Do Until...Loop:条件为 False 时执行循环体。 vb Do Until condition ' 循环体 Loop Do...Loop Until:执行循环体直到条件为 True。
shell脚本forloops&whileloops题解,1、判断/var/目录下所有文件的类型forfilesin/var/*;doif[[-f$files]];thenecho"$filesexistsandisaregularfile."elif[[-h$files]];thenecho"$filesisasymboliclink."elif[[-d$files]];thenecho"$filesisadirectory."elseecho"$fi
一个是先判断后循环,还有就是后面量个为先循环再判断.do while loop do until loop 这两个称为当型循环,可以一次都不执行 do loop until do loop whil 这两个称为直到型循环,至少执行一次,原因是先循环再判断.这里出现的until和while,写条件时,两者的关系正好相反.可以根据书写条件是否方便来决定使用while还是...
We use FOR to iterate over a known range of values and WHILE to evaluate an expression. for (initialization; termination; increment) { statement(s) } while (expression) { statement(s) } The difference between WHILE and DO WHILE is that on WHILE it checks the condition first, than execute...
For loop, while loop and do-while loop
whileloop forloop do whileloop 1.whileloop in C Thewhileloop is anentry controlledloop. It is completed in 3 steps. Variable initialization.(e.gint x = 0;) condition(e.gwhile(x <= 10)) Variable increment or decrement (x++orx--orx = x + 2) ...
Rule #2: Always use the For Each loop when looping through a collection of objects such as the VBA Collection, VBA Dictionary and other collections To make it more simple consider using the For Each loop only when looping through a collection of objects. Related posts: VBA Do While Loop -...