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    00:00:00
    all right guys welcome back and in this
    00:00:02
    tutorial I want to show you guys about
    00:00:04
    this cool little bit of code called the
    00:00:05
    increment operator now what this is is
    00:00:08
    it's a really quick and efficient way to
    00:00:10
    either add one or subtract one from a
    00:00:13
    variable and we'll see later on while
    00:00:16
    this is actually not even useful but
    00:00:18
    like pretty much necessary so let's just
    00:00:21
    go ahead and make a quick little
    00:00:22
    variable right now and actually I don't
    00:00:24
    want to name it X that's boring let's
    00:00:25
    name it tuna because I love
    00:00:28
    tuna and that sounded kind of weird like
    00:00:31
    a love tuna I don't know whatever so
    00:00:33
    anyways we'll just go ahead and print it
    00:00:34
    out on the screen print F do love tuna
    00:00:38
    though and since this
    00:00:40
    is percent D and we'll K it to a new
    00:00:44
    line so we print out tuner right now and
    00:00:46
    of course it prints out 20 on the screen
    00:00:49
    nothing that exciting about that so the
    00:00:52
    cool thing I want to talk to you guys
    00:00:53
    about is this operator and what it is is
    00:00:56
    it's basically a symbol that you add
    00:00:58
    right after your variable name so type
    00:01:01
    in your variable name my case tuna and
    00:01:03
    add two little plus Signs Now what this
    00:01:06
    is going to do is it's pretty much going
    00:01:08
    to say okay I'm going to add one to um
    00:01:12
    your variable so increase its value by
    00:01:15
    one so now tuna is equal to
    00:01:19
    21 so if I copy and print it out now
    00:01:22
    check it
    00:01:23
    out it was 20 that's why I printed this
    00:01:26
    out and then it added one and it printed
    00:01:28
    out the new value now you can also do
    00:01:32
    this with minus minus of course this
    00:01:34
    takes away one or subtracts one from
    00:01:36
    your
    00:01:37
    variable so let me close this and run it
    00:01:41
    again and that's why you got 19 now
    00:01:45
    another thing that I want to point out
    00:01:46
    and that confuses a lot of people is
    00:01:48
    this if I just showed you guys this
    00:01:50
    example and I put that increment
    00:01:52
    operator before tuna and ran this your
    00:01:56
    guys are going to be like okay 24 21 so
    00:01:59
    it really doesn't matter if you have it
    00:02:00
    before or after the variable because it
    00:02:03
    adds one what the heck I never
    00:02:07
    even oh same guy is texting me again
    00:02:10
    freaking want to every time he wants to
    00:02:12
    eat cracker bear cracker bow shut up
    00:02:15
    bagels with my stupid cat all right so
    00:02:17
    right now you may be thinking all right
    00:02:19
    it doesn't matter if you have this
    00:02:20
    before or after tuna it adds one to it
    00:02:23
    tomato tomato but actually even though
    00:02:27
    um it looked the same right now there is
    00:02:29
    a huge difference and I'll show you guys
    00:02:31
    an example and once you guys see this
    00:02:34
    everything is be going to become crystal
    00:02:37
    clear so let's go ahead and make three
    00:02:40
    variables and a equals set it equal
    00:02:43
    anything you want set mine equal to 5 b
    00:02:46
    equal to 10 and let's let's just like uh
    00:02:49
    go ahead and multiply these numbers
    00:02:51
    together so restore that value and
    00:02:54
    answer and right now it's equal to zero
    00:02:56
    but we'll change that later
    00:02:58
    on so so let's just do something stupid
    00:03:01
    like take answer and set it equal to
    00:03:04
    what would it do first Plus+ a and
    00:03:07
    remember that's the increment operator
    00:03:09
    so it's going to add one to the value of
    00:03:12
    a which would become six and multiply it
    00:03:15
    by B would just keep B the
    00:03:17
    same and now I just want to show you
    00:03:20
    guys the answer on the
    00:03:23
    screen and we'll just put the
    00:03:26
    answer percent
    00:03:30
    and we'll bump to a new line so that's
    00:03:32
    pretty much going to say okay a * B
    00:03:35
    print it out on the screen easy enough
    00:03:38
    simple stuff and you actually probably
    00:03:40
    need answer right there if you want to
    00:03:42
    print something out and now what I want
    00:03:44
    to do is I actually want to copy all of
    00:03:47
    this and I want to do the exact same
    00:03:50
    thing again but just changing a few
    00:03:52
    things now the first thing I want to
    00:03:55
    mention is this the reason that I copied
    00:03:57
    this first line as well is because I
    00:03:59
    want to reset our variables back to
    00:04:01
    normal because right now we added one to
    00:04:03
    a so that's going to become Z six excuse
    00:04:06
    me so reset that back to five and also
    00:04:09
    answer is going to go from zero to
    00:04:12
    whatever this is so reset that back to
    00:04:14
    zero so we can calculate it again and
    00:04:17
    also whenever you're resetting um your
    00:04:19
    variables values make sure that you get
    00:04:22
    rid of that int keyword that is only for
    00:04:26
    you only need to say that one time just
    00:04:28
    to tell C um what type of data you're
    00:04:31
    going to store in that variable you
    00:04:32
    don't need it again um it already knows
    00:04:35
    that we're storing ins so get rid of it
    00:04:38
    so right now these pretty much print out
    00:04:40
    the exact same thing so what I wanted to
    00:04:43
    demonstrate is what happens when you
    00:04:44
    have those plus signs called the
    00:04:46
    increment operator on the right hand
    00:04:48
    side instead of the left so run this bad
    00:04:51
    boy and check it
    00:04:53
    out even though we use that same
    00:04:56
    increment operator and even though we
    00:04:59
    use the same
    00:05:00
    equation one time we got 60 and one time
    00:05:03
    we got 50 so what the heck is going on
    00:05:07
    why did that do that because we know
    00:05:09
    that this plus plus sign as we saw
    00:05:11
    before it just adds one it turned that
    00:05:13
    20 into 21 so why are we getting
    00:05:15
    different answers well the reason is
    00:05:18
    because whenever you use the plus sign
    00:05:20
    on the left it works a little bit
    00:05:21
    differently than on the right whenever
    00:05:23
    you use it on the left it changes the
    00:05:26
    value of a before it runs the
    00:05:30
    equation so you can kind of think of
    00:05:32
    this is that add one to a here so it
    00:05:38
    adds one to a before it changes the
    00:05:42
    equation and then this becomes six right
    00:05:46
    now so that's why we got 60 now whenever
    00:05:49
    you have it after the
    00:05:52
    a it pretty much runs the equation with
    00:05:55
    the current value which is five and then
    00:05:58
    it changes the value after after it so
    00:06:00
    if we were to print out a after this it
    00:06:03
    would be six so just remember um that's
    00:06:07
    basically what's going on when you have
    00:06:08
    it on the left hand side it said okay
    00:06:11
    change the value of a before you do
    00:06:13
    anything else when you have it after it
    00:06:15
    it says okay do the equation run this
    00:06:18
    line of code and then change a after so
    00:06:22
    that is why we get these little
    00:06:24
    differences and you know even though
    00:06:27
    it's just a small detail to take care of
    00:06:30
    when you're talking about 60 and 50 that
    00:06:32
    can be you know a difference between
    00:06:35
    like 60 lb of gold and 50 lb of gold is
    00:06:37
    a big mistake so uh if you're
    00:06:40
    programming then that's another thing
    00:06:42
    you want to keep an eye out for so
    00:06:44
    hopefully you guys understand I know
    00:06:46
    it's like a two little symbols and I
    00:06:48
    spend a lot of time on it but I'm going
    00:06:50
    to show you guys why this is incredibly
    00:06:51
    useful in the future and well thank you
    00:06:55
    guys for watching and see you next time

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