assigning a value to a variable or constant?

wperko

Hi,

ibyte = 768

Why does the result of;

DEBUG CR, "ibyte = ", DEC ibyte, CR

give ibyte = 108 ???

What is going wrong here?

Mike Green

Assuming that you've defined ibyte as a byte, it can only hold values from 0 to 255 (since it's a byte - 8-bits). All constants and intermediate values (like in a calculation) in PBasic are words (16-bits) and the extra bits get thrown away when stored in a byte (or nibble or bit variable). I don't know why it shows as 108. That doesn't make sense. 768 is the same as $300. When you store that in a byte, you throw away the 3 and get $00 which is zero. There must be something else going on in the code you're not showing. That's why it's generally misleading when you only show small code fragments.

wperko

Hi,

' ByteParse4.bs2
' {$STAMP BS2}
' {$PBASIC 2.5}
' Initialze
'

---

' Variables
'

---

ibyte VAR Byte ' byte to be converted
hbyte VAR Byte ' bytes to represent Hundreds digit
mbyte VAR Byte ' bytes to represent Tens digit
lbyte VAR Byte ' bytes to represent Ones digit
Remainder VAR Byte
' Initialize ibyte
ibyte = 876 ' initial byte to be converted to 3 values
DEBUG CR, CR, "ibyte = ", DEC ibyte, CR, CR

hbyte = ibyte DIG 2
mbyte = ibyte DIG 1
lbyte = ibyte DIG 0

DEBUG CR, "hbyte = ", DEC hbyte, CR
DEBUG CR, "mbyte = ", DEC mbyte, CR
DEBUG CR, "lbyte = ", DEC lbyte, CR, CR, CR

END

Publison

wperko wrote: »

Hi,

' ByteParse4.bs2
' {$STAMP BS2}
' {$PBASIC 2.5}
' Initialze
'

---

' Variables
'

---

ibyte VAR Byte ' byte to be converted
hbyte VAR Byte ' bytes to represent Hundreds digit
mbyte VAR Byte ' bytes to represent Tens digit
lbyte VAR Byte ' bytes to represent Ones digit
Remainder VAR Byte
' Initialize ibyte
ibyte = 876 ' initial byte to be converted to 3 values
DEBUG CR, CR, "ibyte = ", DEC ibyte, CR, CR

hbyte = ibyte DIG 2
mbyte = ibyte DIG 1
lbyte = ibyte DIG 0

DEBUG CR, "hbyte = ", DEC hbyte, CR
DEBUG CR, "mbyte = ", DEC mbyte, CR
DEBUG CR, "lbyte = ", DEC lbyte, CR, CR, CR

END

As Mike said, if you are declaring ibyte as a BYTE, it can only represent a number up to 255.

Try:

ibyte VAR Word

and see the magic happen.

Sapphire

You set ibyte = 876 in your code, not 768. And 876 in hex is $36C, which if stored in a byte is $6C or 108. In any case, if you want to store a 3-digit number up to 999, you will need to use a word variable. The result of the DIG operator, however, could be stored in a nibble variable, since the value will only be 0 to 9. Variable space is limited, so use only what you need for the range of values you are going to store.