4.11. Lua break statement

发布时间 : 2025-10-25 13:34:10 UTC      

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Lua programing language break statement is inserted into the body of the loop to exit the current loop or statement and start the script to execute the statement that follows.

If you use loop nesting break statement stops the execution of the innermost loop and starts the outer loop statement of execution.

4.11.1. Grammar #

In Lua programming language break statement syntax format:

break 

Flow chart:

Image0

4.11.2. Example #

The following example executes while loop that outputs the value of a when the variable an is less than 20:00 and terminates execution of the loop when an is greater than 15:00:

--[ Define variables --] a = 10 --[ While loop --] while( a < 20 ) do print("The value of a is:", a) a=a+1 if( a > 15) then --[ Terminating a loop using a break statement --] break end end 

The execution result of the above code is as follows:

The value of a is: 10 The value of a is: 11 The value of a is: 12 The value of a is: 13 The value of a is: 14 The value of a is: 15 
《地理信息系统原理、技术与方法》  97

最近几年来,地理信息系统无论是在理论上还是应用上都处在一个飞速发展的阶段。 GIS被应用于多个领域的建模和决策支持,如城市管理、区划、环境整治等等,地理信息成为信息时代重要的组成部分之一; “数字地球”概念的提出,更进一步推动了作为其技术支撑的GIS的发展。 与此同时,一些学者致力于相关的理论研究,如空间感知、空间数据误差、空间关系的形式化等等。 这恰好说明了地理信息系统作为应用技术和学科的两个方面,并且这两个方面构成了相互促进的发展过程。