Label Not Defined ERROR

[pya]

Hi Mikrom,

After a long time I am trying to code with Subroutines.

I get Error: Label Not Defined on Line 145 but not on 95.
Why should this be?
And what is the error trying to tell me?
And how do I get rid of it?

Thanx for your help.

pya

 

[mikrom]

Hi pya,
IMO you mixed SUB and GOSUB.

 

[Geates]

You mean GOSUB and GOTO. There isn't a sub named 300. I'm post-line numbers so, I might be wrong.

 

[pya]

Gents,

I checked again and rectified the error.

Although the conversion from Celsius to Fahrenheit and back is a simple calculation, one of my objectives is to keep learning through coding and invoking new functionality e g CASE SELECT, something which I had never heard of.

pya

 

[Geates]

I'm a huge proponent of SELECT CASE. The main advantage is speed. In a SELECT, the condition is evaluated once, then jumps to the appropriate case whereas with an ELSEIF, each condition is evaluated! Take your code for example (sorry, I don't do line numbers and thus almost never use GOSUB or GOTO so this code may not compile but the notion is still conveyed)

SELECT CASE N
    CASE 1 : GOSUB FAHRENHEIT
    CASE 2 : GOSUB CELSIUS
    CASE 3 : GOSUB KELVIN
    CASE ELSE : PRINT "Incorrect Choice !! "  
END SELECT

N is evaluated once and jumps to the appropriate answer. Also, notice the colon ). It separates commands.

IF N = 1 THEN 
    GOSUB FAHRENHEIT
ELSEIF N = 2 THEN
    GOSUB CELSIUS
ELSEIF N = 3 THEN
    GOSUB KELVIN
ELSE
    PRINT "Incorrect Choice !! "  
END IF

N is evaluated 3 times.

 

[mikrom]

In QB64 you have a comfortable editor, so line numbering is unnecessary. It just makes the program less clear and harder to maintain.

 

[pya]

Thank you mikrom and Geates for your help.
I am constantly learning through this forum.

pya