need help

[pierre2030]

HI,paul borgmeier

-i finish reading the manual and found out that IF---THEN can operate in 2 manners.
-In one form,the THEN in an IF...THEN is essentially a GOTO. If the condition is true,the program will GOTO the label after the THEN.
-In the second form, IF...THEN can conditionally execute a group of statements following the THEN. The statements must be followed by an ELSE OR ENDIF to complete the structure.

-the message got worse when i add ENDIF in the first IF---THEN

TEST:
IF PORTA.0=1 Then
goto TESTING
Else
goto TEST
Endif

and become:

Error C:\CDLITE\THESIS\DECODE1.ASM 67:[231] Attempt to Redefine '_TEST'
Error C:\CDLITE\THESIS\DECODE1.ASM 70:[231] Attempt to Redefine '_TESTING'
Error C:\CDLITE\THESIS\DECODE1.ASM 77:[231] Attempt to Redefine '_TESTING'
Error C:\CDLITE\THESIS\DECODE1.ASM 80:[231] Attempt to Redefine '_CHECKING'

*** 4 Errors***

-what is meaning of those errors?
thank u very much

[paul borgmeier]

Look at the first If-Then you just fixed. How does it differ from your next If-Then? In the first, we added the goto statement to both conditions. Do the same for the second If-then and then your code will compile without errors.

TESTING:
IF PORTA.0=0 Then
goto CHECKING
Else
goto TESTING
EndIF

Good Luck,

Paul Borgmeier
Salt Lake City, Utah
USA

[paul borgmeier]

For clarification as to why your original format did not compile.

snip ... "If the condition is true,the program will GOTO the label after the THEN"

The LABEL needs to be on the same line as the THEN in order for it to be assumed a GOTO. If used in this manner it cannot have an ELSE associated with it.

EXAMPLES:


IF PORTA.0 = 1 THEN TESTING

and

If PORTA.0 = 1 THEN
GOTO TESTING
ENDIF

do the same thing (but the second form takes more program words)

Paul