4 ms·

There's got to be a joke along the lines of "QA guy walks into a bar, goes down to the cellar, orders -1 beers" somewhere in this story.

• dreamcompiler 9y ago
  Visiting the head is when I usually order -1 beers.
• kevin_thibedeau 9y ago
  In the Apple ][ lemonade stand simulation game you could order negative quantities of supplies and your account would be credited without having to actually sell anything.
  • dagw 9y ago
    I now want to plug in my Apple ][, load up lemonade stand and try that.
    • joezydeco 9y ago
      Me too. Just tried it, it filters out negative numbers. https://archive.org/details/a2_Lemonade_Stand_1979_Apple https://archive.org/details/a2_Lemonade_Stand_1979_Apple
      • ghusbands 9y ago
        And it seems to have no obvious overflow issues. Either there are multiple versions or the claim that negative numbers work is simply wrong.
        • joezydeco 9y ago
          Might be more simple than that. In the source of the Apple-published program, there's a comment that it was based on an earlier program from MECC* (you might remember them as the creators of Oregon Trail). That program goes back to 1973. Perhaps that version didn't check the input. * https://web.archive.org/web/20130226024448/http://theodor.lauppert.ws/games/lemonade.htm https://web.archive.org/web/20130226024448/http://theodor.la...
    • deleted 9y ago
      [deleted]
  • marvin 9y ago
    A piece of widely used Norwegian online retail software also did this for a long time. If you had a negative quantity of a product in your shopping basket, the value of the product would be subtracted from your total.