Done DO i=1 to %hi, re-evaluate hi each time

[vefatica]

Could DO i=1 to %hi be made to re-evaluate hi on each iteration? ... for example, so that

do i=1 to 10 ( echos %i & set /q /a hi-=1 )

would produce

12345

I had a use for it today.

 

[samintz]

How do the conditionals work in DO? I tried a simple test that doesn't work.

set hi=10
do while hi gt 0 (echos %i & set /q /a hi-=1)

 

[samintz]

I also tried it in a batch file and that doesn't work either.

set hi=1
DO while hi gt 0
    echos 1
    set hi=0
ENDDO

 

[samintz]

Well, apparently, if you leave off the %'s in front of the hi the script runs just fine but the variable is not evaluated. If you add in the %'s it does what is expected.

set hi=1 & do while %hi gt 0 (echo hi & set hi=0)

 

[Charles Dye]

I imagine DO WHILE or DO UNTIL would do what you want. You'd have to handle initialization and incrementation yourself, though.

 

[samintz]

The conditional is very picky though.
This does not work:

DO WHILE %i != %hi (...)

And this code returns an error:

$ set done=0 & set hi=10 & set i=1 & do while %done==0 (echos %i & set /q /a i+=1 & set /q /a hi-=1 & set done=%@if[%i==%hi,1,0])
TCC: Unknown command "set"

 

[samintz]

My bad. Bad copy & paste. This works, but is ugly.

set done=0 & set hi=10 & set i=1 & do while %done==0 (echos %i & set /q /a i+=1 & set /q /a hi-=1 & if %i GE %hi (set done=1) else (set done=0)
)