首先这3个词在引导时间状语从句时,如果从句的谓语动词是可以持续的,那么3个词是可以互换的。. 比如:When/While/As he walked along the river, he heard a young boy calling"help". 不同之处:. 1. When还可以接瞬时动词,比如:When I arrived at the office, Jane and Paul were working at their ...
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while 循环: 只要特定的条件为真,就会重复执行循环体。 当条件不为真时,循环退出,继续执行后面的语句。 总的来说,如果要在特定的条件下执行一次或多次循环,可以使用if 循环或 while 循环。选择哪一种循环取决于特定的需求。
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The difference is that the while loop will continue to execute as long as the condition is true. In other words, instead of executing if something is true, it executes while that thing is true. 再来一个例子来说明这个问题:. count = 0. if count < 9: print"Hello, I am an if statement and count is", count. while count <= 9: print ...
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while (condition) //do something 1. //do something 2. 说明:. ①while循环的表达式是循环进行的条件,用作循环条件的表达式中一般至少包括一个能够改变表达式的变量,这个变量称为循环变量。. ②当表达式的值为真(非零)时,执行循环体;为假(0)时,则循环结束 ...
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while、when、as的区别为:指代不同、用法不同、侧重点不同。. 一、指代不同. 1、while:在…期间。. 2、when:什么时候。. 3、as:像…一样,如同。. 二、用法不同. 1、while:while用作连词时,表示“在…. (过程)中,在…期间”。. 常用来引导时间状语从句,当主句 ...
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while(i)和while(! i)的意思要看i这个变量( 表达式 )的值是真还是假(0和NULL就是假)。 while(1)和while(99)和while(-76)甚至while(3-100)这类只要括号中的值(或表达式的值)非0,意思一样,代表可以循环并执行循环体,如果是while(0),则代表不执行循环并跳过循环体。
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While it was late,he went on working.(虽然很晚了,但他还在继续工作。) While he is in poor health,he works hard.(虽然他身体不好,但他还是努力工作。) 3、连接两个并列句子,表示“对比”关系。例如: He went out for a walk,while I stayed at home.(他出去散步了,而我却呆 ...
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While she is a top student, she has some shortcomings. While the Internet is bridging the distance between people, it may also be breaking some home or will cause other family problems。 3、“只要,如果”等于as long as,引导条件状语从句。 There is hope while there is life. While you study hard, your effort will pay off。
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一、有了 for 循环,还要 while (1)的原因. 尽管for循环在大多数情况下能够满足循环的需求,但在特定情况下,使用while (1)(或while (true))仍然具有一些优势和适用场景:. 1、无限循环. while (1)是一种无限循环结构,循环条件恒为真,可以用于需要持续执行某段代码 ...
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While I'd be willing to help you on this occasion, I may not always be able to in future. 虽然这次我愿帮助你,但以后可能就不能了。 —————— while 引导等立并列句, while 作并列连词(相当于whereas),引导等立并列句,表示两个句子意思上的对比,while 分句位于句尾,常译成 ...
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