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TI-BASIC
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Spyderbyte
Advanced Member
Joined: 29 May 2003
Posts: 372
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 Posted: 07 Jun 2003 11:34:17 pm Post subject: |
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Is my calculator being weird, or does the variable end up one higher than the max?
For(A,1,5
End
Disp A
A equals 6. Have I just never noticed this? 
Spyderbyte |
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NETWizz
Byte by bit
Bandwidth Hog
Joined: 20 May 2003
Posts: 2369
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| Posted: 08 Jun 2003 02:29:10 am Post subject: |
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| Your calculator is okay. |
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Spyderbyte
Advanced Member
Joined: 29 May 2003
Posts: 372
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| Posted: 08 Jun 2003 09:01:08 am Post subject: |
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Alrighty thanks - I was just wondering.
Spyderbyte |
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Smasher
I'm a llama!
Newbie
Joined: 25 May 2003
Posts: 15
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| Posted: 09 Jun 2003 12:23:35 am Post subject: |
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In case you're interested, here's why that happens. Assuming an example of For(N,1,10), the calculator sets N to 1 and then runs through the loop. For each successive run-through, the calculator increments N, then checks to see if N is less than or equal to 10. Since this condition tests true when N is 10, it will run through the loop, then increment N one more last before checking it, bringing it to 11.
That's probably more info than you needed, but it's nice to know why the calculator does the things it does. |
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Darth Android
DragonOS Dev Team
Bandwidth Hog
Joined: 31 May 2003
Posts: 2104
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| Posted: 09 Jun 2003 12:53:20 pm Post subject: |
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likewise,
Code:
For(N,1,10
N-1->N
End
will never stop repeating |
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NETWizz
Byte by bit
Bandwidth Hog
Joined: 20 May 2003
Posts: 2369
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| Posted: 09 Jun 2003 03:33:23 pm Post subject: |
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| N is a floting point real that will eventually become small enough to overflow. Creating err:overflow. |
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Adm.Wiggin
aka Tianon
Know-It-All
Joined: 02 Jun 2003
Posts: 1874
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| Posted: 09 Jun 2003 03:48:29 pm Post subject: |
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| maybe... y dont we try it on an emulator? that way, if it crashes, it is still safe! |
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Spyderbyte
Advanced Member
Joined: 29 May 2003
Posts: 372
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| Posted: 09 Jun 2003 04:16:43 pm Post subject: |
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Quote: In case you're interested, here's why that happens. Assuming an example of For(N,1,10), the calculator sets N to 1 and then runs through the loop. For each successive run-through, the calculator increments N, then checks to see if N is less than or equal to 10. Since this condition tests true when N is 10, it will run through the loop, then increment N one more last before checking it, bringing it to 11.
That's probably more info than you needed, but it's nice to know why the calculator does the things it does.
Yeah I figured out why it does it, I had just never noticed it before.
Spyderbyte
Quote: N is a floting point real that will eventually become small enough to overflow. Creating err:overflow.
I don't understand what you mean. Doesn't the N-1->N just cancel out the the for loop? I ran it on VTI, and had it increment A each loop, and when I stopped it A was over 16000, and I didn't run into any problems.
Spyderbyte |
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NETWizz
Byte by bit
Bandwidth Hog
Joined: 20 May 2003
Posts: 2369
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| Posted: 09 Jun 2003 04:37:42 pm Post subject: |
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Yeah, good point.
The for loop ads one, and N-1->N subtracts one.
I guess it could run forever or until the batts go dead. |
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Darth Android
DragonOS Dev Team
Bandwidth Hog
Joined: 31 May 2003
Posts: 2104
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| Posted: 10 Jun 2003 09:59:13 pm Post subject: |
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| i know bcuz i made the mistake of doing so! |
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