ON在QBasic中做什么？(What does ON do in QBasic?)

ON在QBasic中做什么？(What does ON do in QBasic?)

我一直在研究一个项目，在这个项目中，我采用了一个旧程序并创建了一个新版本......问题是它是用Quick Basic编写的，它有一行我不明白的代码

ON FLAG% GOTO 1730, 1900

谁能告诉我这是什么？ 顺便说一句，我正在研究VisualBasic

I have been working on a project, in which I take an old program and create a new version of it .... The thing is that it is written in Quick Basic and it has a line of code that I don't understand

ON FLAG% GOTO 1730, 1900

Can anyone tell me what this is ??? By the way I'm working on VisualBasic

最满意答案

它基本上是这种语句的简写语法：

IF FLAG% = 1 THEN GOTO 1730 ELSE IF FLAG% = 2 THEN GOTO 1900

有关更多信息，请参阅此文章 。

对于更多选项，您可能会转向更现代语言的switch语句。

It is basically a shorthand syntax for this type of statement:

IF FLAG% = 1 THEN GOTO 1730 ELSE IF FLAG% = 2 THEN GOTO 1900

See this article for more information.

For more options you would probably turn to a switch statement in more modern languages.