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Write various number

modern-day computers use electricity to work and inside of a microchip electricity is turned either on or off which is represented by the symbols 1 and 0 this is called binary you've probably heard of binary already and that that's how computers work but do you know how binary works well you're about to find out but first we need to understand exactly how our numerical based system known as decimal or base 10 works the way it does so there are 10 counting 10 symbols that we use for all of our numbers starting from 0 we can count all the way up to 9 before we run out of symbols to use now we could just keep adding symbols at this point but that would get out of hand very quickly I mean can you imagine having to memorize a specific symbol for every single number that's ridiculous and that's why we reuse the same symbols over and over again in a very clever system called positional notation so in the base 10 system as soon as we get to 10 or an exponent of 10 we need to add another digit to the left of our current digit because there are 10 symbols each new digit has to have a value 10 times greater than the digit to it's right so that's using 10 symbols but what if you had only 2 symbols to work with well then everything that I said still applies with just two symbols each new digit needs to have a value 2 times greater than the digit to it's right so a sequence like this would equal 1 times 128 plus 1 times 16 plus 1 times 8 plus 1 times 2 plus 1 which is 155 and that's how you count in binary it's actually really simple it's just multiplication and addition now it gets a lot more complicated from here with bits and bytes and boolean logic and ASCII and the list just goes on and on so let's return to base systems there are a lot of ways to write numbers other than decimal and binary you've got base to base 3 base for base 5 I could go on they all work with the same principles of positional notation so you might be wondering with all these numbering systems to choose from why do we use base 10 that's a good question this goes all the way back to Roman numeral an Egyptian hieroglyphs it's likely that we use base 10 simply because we have 10 fingers also known as digits other based systems like base 8 and base 12 are actually superior for simple everyday math since 8 and 12 are much more easily divisible than 10 but it's definitely too late to change our minds about using base 10 we'll probably be stuck with it forever switching away from it now would be even harder than trying to convince America to drop the Imperial system and finally switch to metric you know like the rest of the civilized world like yeah the metric system is superior but who's gonna tell America what to do now if you're going to be using base 12 or any other base system with more than 10 digits its standard to use letters to represent numerals higher than 9 so 10 is a 11 SB 12 is C and so on this is called alphanumeric you know those URL shorteners that you see on Twitter and elsewhere have you ever wondered how they work all those jumbled characters really just represent a very large number by using numerals and every letter of the alphabet you can get all the way up to base 36 using lowercase and uppercase letters gives you base 62 and with that you can get all the way up to 14 million with only four digits with just 10 digits you can get up to 839 quadrillion possible values that's a lot of shortened URLs so you just learned about positional notation binary numbers numeral based systems alphanumeric characters and URL shorteners I hope you enjoyed it and if you're in the mood for more learning maybe you'll like today's video sponsor which is the excellent lynda.com for the past six years I have been using and recommending lynda.com to people as an excellent means of learning new things especially software you see over six years ago I wanted to learn how to use Photoshop so I googled around and as usual many of the software tutorials I found just assumed that I had pre-existing knowledge either that or they'd be out of date not have enough pictures if any have unclear missing or downright incorrect instructions worst of all I was having to piece everything together based on multiple disparate instruction from overlapping and sometimes conflicting sources of information and then I discovered lynda.com which is pretty much the opposite of all of that lynda.com has thousands of high quality easy to follow video tutorials taught by industry experts who actually know what they're talking about they've got a wide variety of subjects like photography programming video and photo editing and tons and tons of different software each course is structured so you learn from start to finish at your own pace on your own terms access to all of their courses starts at $25 a month but if you head over to lynda.com slash tech quickie you can get a free 7 day trial and see for yourself just how excellent they really are thanks for watching this episode of 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