Boolean Logic

[Jedd]

Ok I have an idea of what boolean logic is and I think I may have used some in past programs. But can someone explain to me it's exact use in BASIC progs, and what you would use it for? Thanks.

[NETWizz]

You would use it to test conditions

ClrHome
Input A
If A=2
Disp "A IS 2

or

ClrHome
Disp "YOUR NAME?
Input "NAME",Str1
if Str1="JEDD"
Then
Disp "I AM JEDD TOO
Else
Disp "YOU ARE NOT JEDD
End

or

ClrHome
0->A
RandInt(1,1000)->B
input C
If C=B
Then
Disp "YOU WON IN
Disp A+1,"GUESSES
Stop
Else
If B>C
Then
Disp "BIGGER
Else
Disp "SMALLER
End
A+1->A
End

A stupid guessing game above

[Jedd]

Err I think you left out a loop that should have been before the Input C (but I didn't run the code so I dunno). So is B.L. just If/Then/Else statements? Cuz if so then, hehe, yeah I've used 'em a few times.

[NETWizz]

Yeah, I think you are right :)

Insert a line before input C and put While 1 on it

Add a line to the end of the file and make the line say End

... enjoy

[Jedd]

ClrHome
Disp "BETWEEN 1 AND"
Input C
randint(1,C)->B
0->A
1->D
Repeat (A=B)+(D=10)
D+1->D
Input "GUESS?",A
If A<B
Disp "HIGHER"
If A>B
Disp "LOWER"
End
If D<10
Disp "CORRECT!'
Disp "YOU WIN!"
Else
Disp "RAN OUT OF GUESSES!"
Disp "YOU LOSE!"
End
Output(1,1,""

I think this will work. The reason I'm completing "parenthesis" and such is because I just began programming C. The above program won't work if you pick a number below 1.

Edit: hahaha. I would change the B) but I like it too much. Just change it to [Capitol B][Curly Brace].

For those of you that are confused, there was a in place of B).

...Thanks Arcane.

[Bryan Thomas]

Yeah boolean logic is probably one of the best things to know when programming BASIC. It shortens up code and speeds things up alot more.

I used it alot in Contra, Agility, and Dotz.

Basically this is how it works:

It test the giving statement and if it is true it returns a 1, and if it isnt it returns a 0. So basically it has digital output.

I used it alot when I want to make things move. Because I cand do it much easier then using if statement: here is an example of a pxl moving around the screen that will not go outta the boundaries.

this means not equal to:
/=

Delvar A
Delvar B
Repeat Z=105
Pxl-on(A,B
getkey->Z
A+(Z=34 and A/=62)-(Z=25 and A/=0)->A
B+(Z=26 and B/=94)-(Z=24 and B/=0)->B
End

See how much easier it is?

[DarkerLine]

I think it is also faster to use +, -, and * for or, not equal to (put /=, !=, or <> according to your preferences), and and.

[Jedd]

[X1011]

You could also replace (A/=0) and (B/=0) with just A and B

[Jedd]

Good point. Unless you made it so the game moved more than 1 pixel.

[DarkerLine]

[anduril66]

Isn't not(not(A the same as A? (what X1011 said)

So you could use:
B+(Z=26)(B<>94)-B(Z=24->B instead, for example.

[DarkerLine]

[X1011]

B+(Z=26)(B!=94)-(B and Z=24->B

Would that be faster than not(not(?

[Arcane Wizard]

Don't know if it's faster(probably is), but it sure is smaller and easyer to read.

[DarkerLine]

[Jedd]

Everyone seems to leave off the last curly brace after a statement. I used to too, but it looks cleaner if it's there. But aside from looking clean, does taking it off really make it go any faster? I know it saves space, but that's not what im asking.

[DarkerLine]

It doesn't make it go much faster but the parser doesn't have to check as many bytes for the line so yes it does make the program a tiny bit faster.

[Jedd]

Because that's what I though about IfStatement-Action, but it turns out IfStatement-Then-Action-End is a little faster.

[Arcane Wizard]

Yeah, the if then end thing is faster if you include the then end part, but with curly braces it should be slower (to close them) since we only remove them if they are at the end of the line, which comes several bytes sooner if there are less closing curly braces. And it doesn't have to check for several if you just use : it closes all of them that happened to be open.