From: jj4public@gmail.com   
      
   On Mon, 8 Mar 2021 14:54:43 -0500, Tom Del Rosso wrote:   
   >   
   > I know that, but it should do the same with   
   >   
   > set /a y=x   
   >   
   > As it says in the set help, "Any non-numeric strings in the expression   
   > are treated as environment variable names whose values are converted to   
   > numbers before using them."   
   >   
   > So the conversion is done incorrectly, producing zero as if the variable   
   > was not denied at all.   
      
   You're right. More like it's the error handling which is not done   
   incorrectly.   
      
   It's probably too late to fix the bug, as administrators/programmers have   
   accustomed to this bug. Cause fixing the bug would cause the zero value not   
   be assigned to the variable by SET/A when there's an error. That would   
   affect existing batch files' program logic.   
      
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