IF bug THEN tell me

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Boulderdash(Posted 2006) [#1]
This works ok.....
If (psl And 16) Then rs=1 Else rs=0
If rr<>0 And rs=1 Then rr=rr+3

This doesnt work....
If rr<>0 And (psl And 16) Then rr=rr+3
If (psl And 16) Then rs=1 Else rs=0

it should work but why doesnt it?????

Boulderdash(Posted 2006) [#2]
PS just to explain what im trying to achieve;
I am trying to add 3 to 'rr' when (psl and 16) isn't zero

DJWoodgate(Posted 2006) [#3]
If rr<>0 And (psl And 16)<>0 then rr=rr+3.

Because And does not do a logical comparison, it does a bitwise And, so your test will fail to do what you want because it is Anding bit 1 from the rr>0 comparison with a bit set at position 5 from the (psl And 16) operation.. This will result in zero. So you change that operation into a comparison as above, or you could do a Shr to shift the bit into the right position so: If rr<>0 And (psl And 16) Shr 4 Then... which will also work in this instance.

Boulderdash(Posted 2006) [#4]
Thanks for help, my confidence has been restored!