Problem with LONG Variables

[MBB]

I was having problems using LONG variables in a complex program so I wrote this simple one to try to understand what was happening.

I'm using a PIC 18F252.

;Variables
Dim Aa As word
Dim Bb As word
Dim Cc As long
'
Aa = 823
Bb = 346

locate 0, 0
print Aa

locate 1, 0
print Bb

'
Cc = Aa * Bb

locate 2, 0
print Cc

At location 0, 0 on the LCD, I see 823 which was expected.

At location 1, 0 on the LCD, I see 346 which was expected.

But at location 2, 0 on the LCD,  I see 86.  I expect3ed to see 284758 ( 823 * 346 = 284758).

I've tried DIMing Aa and Bb as LONG but still don't get the correct answer

What am I doing wrong?

[YT2095]

LONG will treat the variable as a Word (16 bits) as opposed to a Byte of 8 bits. so the Most you can have is 65535, you`re over 4 times that value, no idea why you get 86 though, unless it`s some sort of wrap-around?

[Frank]

I don't think the LCD library has a routine yet for printing longs so its just printing the low byte of the long Cc.

You could try printing out the four bytes of the long individually in hex -

LCDHex(Cc_E)
LCDHex(Cc_U)
LCDHex(Cc_H)
LCDHex(Cc)

just to check that the calculation is working.

[Hugh Considine]

There was no routine in the LCD library to print Long variables, but adding one seemed like a good idea. So, please try the update from http://gcbasic.sourceforge.net/update.html - if the new LCD Print routine works, I will adapt it for RS232 as well.

[MBB]

The Update worked.

Thanks!