Post by Dark Blue Monkey in Possible issues.

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I am trying to make a loop to detect if something has changed. Normally I'd use a previous and current variable, like so:

:set_integer var="prev_val" value="current_val"; // <- store previous value

:gosub("randomly_change_current_val");

:if (prev_val != current_val){ // <- test for change

: print "something changed.";

}

, but I can't seem to get the value to be evaluated as an integer, it just thinks I keep meaning the word. I've tried lots of permutations but I can't seem to assign the value of a variable into another variable. Is this possible? I'm implementing a workaround for now using a loop, but I suspect I'll blow the stack if I'm not careful. It's a nasty hack :)

make_equal : subroutine {

: if (prev_val < current_val) { :increment "prev_val"; :gosub "make_equal"; }

:else_if (prev_val > current_val) {:decrement "prev_val"; :gosub "make_equal";}

}

Adventuron5 years ago(+1)

It's in the documentation. The value="" always expects an integer value, and will interpret it as an integer.

:set_integer var="prev_val" value="current_val";

To set based on the result of an expression (which can reference an integer variable) use:

:set_integer var="prev_val" {(current_val)}

Dark Blue Monkey5 years ago (1 edit)

Ahh! OK. The first one was what I was trying, and it just kept saying invalid integer "current_val", as you'd expect.

I think my attempts to do the second one failed because of a bug elsewhere in the subroutines block, but the error always seemed to gravitate to the "}" at the end of the block... Thanks again! I've removed my shonky iterative setter. :)

Perhaps a concrete example of setting a variable equal to another variable in the documentation might help new users?

Adventuron5 years ago(+1)

I might just add a : copyvar; command even though it's technically redundant. Might be good for users that don't want to go into the EXPRESSION FORM rabbit hole.

itch.io

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