empty while loop

Day 4: loop structure (while, do... While, ),... While1. Loop Structure (while, do... While,) 1.1. What is a loop structure In daily life, there will be a lot of things that need to be done repeatedly, such as four seasons of every year, 7 days of

1. Loop Structure (while, do... While,) 1.1. What is a loop structure In daily life, there will be a lot of things that need to be done repeatedly, such as four seasons of every year, 7 days of every week, 3 meals a day, and 50 copies of each

Recently, when I wrote a shell script, I defined some variables in the while loop, but when I called them after exiting, we found that the variable values were empty, and it took a whole day to find the cause:I'm just doing a rough experiment here,

ForeachPhp Tutorial 4 (not php 3) includes the foreach structure, which is similar to perl and other languages. This is just a simple way to traverse arrays. Foreach can only be used for arrays. An error occurs when you try to use it for another

A Bash Script: A while loop in the Loop Structure Like other languages, the Bash loop structure also contains the while statement.Basic Structure While condition do loop body done Like the for statement, its loop body is also do... Done structure.

Java cyclic statements-general Linux technology-Linux programming and kernel information. The following is a detailed description. Java loop statements include for, while, and do-while. These statements create what we usually call a loop (loops ).

A while loop in PHP that iterates through the number of code block attempts, or loops through code blocks when the specified condition is true. ------------------------------------------------------------- When we write code, we often need a block

Using the While loopYou can use the while loop to count.1 while 5 : print (current_number) 1Let the user choose when to exitYou can use the while loop to keep the program running as the user wishes. prompt = " \ntell Me Something, and I'll

While loop introduction and basic Format (master): Loop structure: when the conditions are met, the program repeats the conditions that make up the loop structure of a piece of code:1) cyclic control conditions 2 )

While loopWhile loop is the simplest loop in PHP. Its basic format is: The code is as follows:Copy code While (expr ){Statement}// OrWhile (expr ):StatementEndwhile; This syntax indicates that as long as the expr expression is TRUE, statement