Ich kann Deutsch erst am Niveau B2 sprechen.

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Cake day: June 6th, 2023

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  • Right away, I can tell it’s not going to be easy. No square number ends with 2, 3, 7 or 8.

    Assuming the number is square, the first digit can be found through successive approximation, the last digit is then mapped to 0→0, 1→1/9, 4→2/8, 5→5, 6→4/6, 9→3/7. To differentiate between the low/high number in ambiguous cases, one can estimate the difference from the bottom/top of the decade, compare to ⌷5² (can be calculated with an easy trick) or check for division by 3.




  • You’ve never used function keys? The dual function is annoying even inside the OS. I have to help several people with laptops and you can’t tell what mode they’re in, the user often doesn’t know either.

    On laptops, you never know if the F-key behavior is defined by the OS, BIOS or keyboard driver. I just mash F2, F8, Fn+F2, Fn+F8, Del as often as I can (these are the most common keys to do the trick). You can reduce the options with a USB keyboard with just normal F-keys.

    Some laptops don’t have a key you can hold to enter BIOS settings or boot menu (maybe to start booting before the keyboard is initialized?) and there is a reset button hole for that.





  • ChaoticNeutralCzech@feddit.detoCool Guides@lemmy.caA cool guide to soldering
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    6 months ago

    What it looks like: You shat all over the board.
    What it smells like: Nasty chemicals but only when hot.
    What it does: it helps distribute heat, and causes the solder to be less viscuous and stick to metals readily.
    What it feels like to start using it: Wow, it’s like I just gained one year of soldering experience!
    What it feels like to remove it from the board after soldering: Aargh… I swear, one more board and I go buy an ultrasonic cleaner. (Some brands are easier but I usually need to employ a spudger, brush, then alcohol annd Q-tip)

    Note that some solder comes with a core that contains flux or some similar substance of that effect.