Objective-C Tutorial - Lesson 2: Part 1: Programming Basics and Vocabulary Video Lecture | Learn and Understand: Objective C (English) - Web Development

[Music]
hey what's up guys this is makkng
computer help here with lesson 2 in
objective-c tutorials
now today I'll be going over to
programming basics and vocabulary so a
lot of definitions and terms but this
lesson is vital for understanding a lot
of programming now burst you may have
heard like the syntax is a little hard
to understand or something like that
what syntax and what semantics now
they're kinda related but completely
different in a way syntax is the way
symbols are combined to create
statements and statements we'll go over
in the next slide but it I kind of
relate this to grammar because
everybody's familiar with grammar um
syntax would be like the way subjects
verbs pronouns adjectives and adverbs
are created to form a sentence so like
Bill likes to go fly-fishing on the
weekend weekends now it would use like
Bill the subject likes the verb you know
all the different parts all the syntax
you know to create the sentence now
semantics that means that it's
grammatically correct
um bill likes to go fly fishing on the
weekends
that's semantically correct
um what wouldn't be is Bill likes to go
fishing fly on weekends though if you
switch the adjectives after the after
what they modify that isn't correct
anymore so you may have the correct
pieces of a program but if you don't put
it in the right way um it's gonna come
up with an error now statements the in
scar and the instructions you give the
computer down below there there's a
statement NSLog parentheses a quotation
this is a statement notation close
parentheses semicolon
well you actually understand exactly
what all that means by the end of this
tutorial
now there's different types of
statements on a declaration allow space
for data you declare a variable we'll be
going over what a variable is in the
next slide but you declare it means that
you set apart you say I want to declare
this for this that's all you do you're
not giving any instructions to the
computer so
declaration will make a whole lot more
sense in the next slide instructions
like do this please you know so you're
telling the computer to do a specific
thing structure this kind of
self-explanatory there now there's
different things that go along with the
instructions there's the operator which
is assembled that represents an
operation so like plus/minus division
stuff like that now functions groups of
statements and objects are groups of
methods together now function objects
you don't really have to understand that
right now because we'll be going over
that in later tutorials but really just
need to understand operator right now
now variables variables are just names
that refer to a specific piece of data
in memory now there's different types of
variables and these are called data
types for example int int that arm
stands for integer and I'll be going
over a whole list of different data
types in the next slide
now there's I and I didn't identify and
that's the name for the variable so
variables in objective-c are very much
like variables in algebra you declare it
so you would do like int X semicolon and
there you declared an integer and you
named it X now for the naming use only
letters from the alphabet and start with
the lowercase and uppercase for example
an integer is lowercase and uppercase to
avoid any words that are used by Apple
or objective-c
as we get deeper into programming with
Objective C there's lots of different
words that you'll be using and you don't
wanna be using those words obviously to
for the names of your variables and one
last thing Objective C is case sensitive
so lowercase uppercase and integer all
uppercase and integer all lowercase and
injure those are all three different
variables so remember that