China DOS Union

There is a passage like this in the post
====================================================
choice Using this command lets the user input a character, and then run different commands. When using it you should add the /c: parameter; after c: you should write the characters that may be entered in the prompt, with no spaces in between. Its return codes are 1234...

For example: choice /c:dme defrag,mem,end
will display
defrag,mem,end?

For example, the contents of test.bat are as follows:
@echo off
choice /c:dme defrag,mem,end
if errorlevel 3 goto defrag should first test the highest error code
if errorlevel 2 goto mem
if errotlevel 1 goto end
===============================================


If the return code order after /c: is 1234......
Then shouldn't it be like this below:
if errorlevel 3 goto end should first test the highest error code
if errorlevel 2 goto mem
if errotlevel 1 goto defrag

The /c parameter of choice allows the user to set the options, and the DOS system returns them one by one according to the order of the given options. The IF condition commands must be written in descending order of the return values, because this command makes the ERRORLEVEL condition true when the return value is greater than the specified value. So, when the user presses the D key the system gives it a return value of 1, and when pressing the m or e key it is 2 or 3. Because it is descending, set it as: if errorlevel 3 goto defrag should first test the highest error code
if errorlevel 2 goto mem
if errotlevel 1 goto end

I still don't quite understand it, but as long as I know it's not wrong that's fine
Learned from your teaching!

Hehe...... just remember it first, and slowly come to understand it later...... go take a look at mys's "Ten Commandments of DOS" in the chatter section...

Re Master Rushi:

The question raised by "Bozai" is correct: according to the content of choice, "choice /c:dme defrag,mem,end", when errorlevel >= 3, it should goto end, not goto defrag; likewise for errorlevel >= 1.