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<1234567…34>
  • Raising to the powerA curiosity of ZX Basic I found yesterday is that you can't do this: [code] 10 LET x=-3 20 LET y=x^2 [/code] While you can for example do LET y=-3^…

    ... to as a floating point number and not an integer, and ... no real solution to a negative number raised to a non integer ...
    Winston Winston April 2013 Sinclair Basic
  • Thinking of a gameChaps I'm thinking of a game where you worked for the mob

    ... . You could enter a large negative number and you got the opposite ... of that number?

    I'm sure ...
    Vampyre Vampyre April 2002 Games
  • Question about CP Z80 instructionSorry if this is the wrong folder, but it seems the most appropriate. When performing a CP instruction, is the P flag set when the compared values …

    ... you add a negative number and a positive number together you don't ... be taken to be a negative number in signed arithmetic.

    negative"?

    [ This Message was ...
    Quirky Quirky March 2003 Emulators
  • I would like to write emulatorHi guys, I'm new to this forum but I realise that you must get loads of posts from people asking "how do I write an emulator" so I'll try and be spe…

    ... ) that we can represent a negative number by working out its one ... of these numbers must be negative right?

    MadDoc,
    MadDoc MadDoc September 2004 Development
  • I would like to write emulatorHi guys, I'm new to this forum but I realise that you must get loads of posts from people asking "how do I write an emulator" so I'll try and be spe…

    ... we can represent a negative number by working out its ... br /> When you treat a number as two's complement.
    number is - it's ... to care about whether the number is signed or not ... of these numbers must be negative right?[/quote]

    cyborg cyborg September 2004 Development
  • I would like to write emulatorHi guys, I'm new to this forum but I realise that you must get loads of posts from people asking "how do I write an emulator" so I'll try and be spe…

    ... a value is positive or negative. I am I going about ... bother: when you store a number it IS in it's ... then you would convert the negative number to it's positive 2s ...
    cyborg cyborg September 2004 Development
  • Lesser used BASIC commandsAre there any interesting articles or books that explore some of the lesser used BASIC commands/functions e.g. DEF FN, IN, OUT etc? The Spectrum BAS…

    ... the square root of a negative number would result in an error ...
    Ian Hamilton Ian Hamilton May 2006 Sinclair Basic
  • Lesser used BASIC commandsAre there any interesting articles or books that explore some of the lesser used BASIC commands/functions e.g. DEF FN, IN, OUT etc? The Spectrum BAS…

    ... the square root of a negative number would result in an error ... imaginary parts of the complex number separate or use polar representation ...
    Alcoholics Anonymous Alcoholics Anonymous May 2006 Sinclair Basic
  • Sprite adviceHello. So, I'm slowly getting to grips with Z80 assembly - currently equal parts frustration and enjoyment. Now looking for some advice to help shift…

    ... -ZERO result.

    However, negative numbers, I think, are causing ... 't work, because of how negative numbers are represented (-4=1111 ... a way of converting a negative number to its absolute value. e ...
    48K 48K August 2006 Development
  • Sprite adviceHello. So, I'm slowly getting to grips with Z80 assembly - currently equal parts frustration and enjoyment. Now looking for some advice to help shift…

    ... ZERO result.

    However, negative numbers, I think, are causing ... t work, because of how negative numbers are represented (-4= ... a way of converting a negative number to its absolute value. e ... way how to recognize if number is negative or just above 127 ...
    Fikee Fikee August 2006 Development
  • PZX file format draft[QUOTE=Andrew Barker;186084]To this date, there is no rival format for TZX, despite people saying they can do better. Well the challenge is on, prov…

    ... . However if you compute the number of bytes used as (bit_count ... actually helps to say the number is a signed quantity that ... , then any large number here, or even a negative number, will still overflow ... . If you check for the number to be less than 0x7FFFFFF7 ...
    Laser Laser May 2007 Emulators
  • Oneliner contestHello to you all, I dare you to make a program on 1 BASIC line. Here is the place to sent your ONELINERS [url]http://www.zxspectrum.00freehost.co…

    ... a player will type a negative number for both coordinates "by accident ...
    Einar Saukas Einar Saukas October 2007 Development
  • Oneliner contestHello to you all, I dare you to make a program on 1 BASIC line. Here is the place to sent your ONELINERS [url]http://www.zxspectrum.00freehost.co…

    ... a player will type a negative number for both coordinates "by accident ...
    Digital Prawn Digital Prawn October 2007 Development
  • New oneliners for 2008[INDENT][INDENT][INDENT]Here's my attempt at a first-person-perspective 3d game in one line of BASIC. It's called 'wormhole', and you've got to get t…

    ... zero, or a postive or negative number. The great thing about that ...
    Digital Prawn Digital Prawn March 2008 Development
  • New oneliners for 2008[INDENT][INDENT][INDENT]Here's my attempt at a first-person-perspective 3d game in one line of BASIC. It's called 'wormhole', and you've got to get t…

    ... zero, or a postive or negative number. The great thing about that ...
    bigjon bigjon March 2008 Development
  • FMV on +3eOK, so about 6 months ago i posted here that i got full motion video on +3e, with a bunch of scr files called passion. I added the glider rider music…

    ... running logarithmically on both the negative and the positive so my ... you were throwing away every negative value, so the table was ... spends extended periods as a negative number. I'm sure for a ...
    nuggetreggae nuggetreggae April 2010 Development
  • Birthday PlotsHello all; When browsing the web, I stumbled across an oddity known as Birthday Plots. In effect somebody enters a numeric date and the computer prin…

    ... the number of digits in the date entered. C is negative, line ... computes the RND of a negative number (maybe it produces something in ...
    Alcoholics Anonymous Alcoholics Anonymous July 2011 Sinclair Basic
  • Birthday PlotsHello all; When browsing the web, I stumbled across an oddity known as Birthday Plots. In effect somebody enters a numeric date and the computer prin…

    ... computes the RND of a negative number (maybe it produces something in ...
    Einar Saukas Einar Saukas July 2011 Sinclair Basic
  • Problem with a small basic routineDear all; I have been messing about with a routine (originally published in Your Computer 1982, by Tim Langdell). The idea of the program is to simul…

    That's because it is taking the square root of a negative number in line 40.

    Are you sure it shouldn't be "SQR((10**4)-X*X))" in there? Note the double asterisk keyword for power. Just replace the 10**4 with 10000.
    Alcoholics Anonymous Alcoholics Anonymous November 2011 Sinclair Basic
  • Problem with a small basic routineDear all; I have been messing about with a routine (originally published in Your Computer 1982, by Tim Langdell). The idea of the program is to simul…

    ... the square root of a negative number in line 40.

    SKR SKR November 2011 Sinclair Basic
  • Games featuring... relevant bugsThere was a recent improvement to the WoS database in order to classify [URL="http://www.worldofspectrum.org/forums/showthread.php?t=34261"]Games fea…

    ... 's contrived to get a negative number on the stack. As it ...
    Battle Bunny Battle Bunny July 2012 Infoseek database
  • Elliptical ChallengeSubsequent to the recent "Graph Plot" thread, I wrote this general purpose ellipse drawing routine which will plot (although it doesn't actually use …

    ... 'm sure it's the negative number handling which is messing it ...
    Battle Bunny Battle Bunny November 2012 Development
  • Games featuring... relevant bugsThere was a recent improvement to the WoS database in order to classify [URL="http://www.worldofspectrum.org/forums/showthread.php?t=34261"]Games fea…

    ... 's contrived to get a negative number on the stack. As it ...
    na_th_an na_th_an February 2013 Infoseek database
  • Raising to the powerA curiosity of ZX Basic I found yesterday is that you can't do this: [code] 10 LET x=-3 20 LET y=x^2 [/code] While you can for example do LET y=-3^…

    ... you try to raise a negative number to a power it wants ... because that is a complex number.
    guesser guesser April 2013 Sinclair Basic
  • Raising to the powerA curiosity of ZX Basic I found yesterday is that you can't do this: [code] 10 LET x=-3 20 LET y=x^2 [/code] While you can for example do LET y=-3^…

    ... as 'e' is a positive number ( approx. 2.718 ) it's ... any power to give a negative number, and therefore the Spectrum '^' function ... won't work for negative numbers and repetitive multiplication has ...
    Battle Bunny Battle Bunny April 2013 Sinclair Basic
  • Can a guy that traveled on the short bus learn machine code...Hmmm So after some soul searching I figured it was time to finaly nail spectrum machine code. Its so frustrating to sit infront of a basic listing w…

    ... ! I meant to say that negative numbers don't exist in ... , isn't a negative number just the way that number is interpreted?
    number, -2 is internally the same ...
    poppichicken poppichicken August 2013 Development
  • Can a guy that traveled on the short bus learn machine code...Hmmm So after some soul searching I figured it was time to finaly nail spectrum machine code. Its so frustrating to sit infront of a basic listing w…

    ... meant to say that negative numbers don't exist ... t a negative number just the way that number is interpreted?< ... can also have a min. negative score of -85
    negative or the true value ... /> Relative JUMPs use also negative numbers but there bit 7 ...
    Dr BEEP Dr BEEP August 2013 Development
  • Can a guy that traveled on the short bus learn machine code...Hmmm So after some soul searching I figured it was time to finaly nail spectrum machine code. Its so frustrating to sit infront of a basic listing w…

    ... ! I meant to say that negative numbers don't exist in ... , isn't a negative number just the way that number is interpreted?
    number, -2 is internally the same ... , though binary certainly does have negative numbers (sometimes). It is entirely ...
    AndyC AndyC August 2013 Development
  • SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…

    ... /> call prep_m_or_d ; prepare number to divide by
    jr ... /> call prep_m_or_d ; prepare number to be divided
    ... /> ld c, 255 ; assume negative number
    bit 7, d ; ... test for negative
    jr nz, t_numeric ; ...
    chev chev October 2013 Development
<1234567…34>

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