3. Demo - First Program - video Dailymotion

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Technical Education

7/22/2024

3. Demo - First Program

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00:00let us write our first program in C++ here I start Xcode create a new

00:06project in Xcode and select this option that is command line tool then you

00:14have to mention some project name that is first is the project name and the

00:18language selected is C++ there are other options also available select C++

00:24then next so where is supposed to create it so you can set the path here

00:30wherever you want to create your project say create here are the project files so

00:38click on main.cpp you can see that a ready-made code is given so it has

00:43already generated a piece of code that is executable code here are a few

00:48comments I'll remove them I'll remove these panels yeah see this command line

00:58arguments these are optional in C++ I'll just remove these command line

01:03arguments will study about these after some time so here is a readily available

01:09hello world program I'll run this let us see what I'll get here is an output

01:16window yeah hello world the output is given here here std scope resolution is

01:27used for accessing cout so instead of this we can also mention using namespace

01:36using namespace std now I don't have to use std for using cout object let us

01:45run this and check once again that's it so this is working the same program I'll

01:56just modify it for adding two numbers I'll remove these lines and I will write

02:01on the code here for adding two numbers I'll declare few variables integer a b

02:07and c see you can see that's a prompting here if there is any error in the

02:13statements see out enter two numbers then seen a and b then see a sign a plus

02:32B see out sum is then give a space and see so this is a program for taking two

02:46numbers from keyboard and adding them and displaying the result so these two

02:51lines are for taking input from the user these two lines are interactive as it is

02:55giving a message to the user informing him to enter two numbers then adding two

03:00numbers and finding sum and displaying sum here let us run this now here is a

03:08message enter two numbers I'll enter two numbers 10 and 30 now here the sum is 40

03:15I should get nl here so that the last message should come in next line nl

03:23let me run

03:29enter two numbers 10 and 30 so now this program ended with exit code 0 that is

03:36coming in the next line so sum is 40 that's it so let me modify the same

03:42program and make it as a program for taking the user name and displaying a

03:47welcome message so string is a built-in class available in C++ library that is

03:54stdio stream and we can access in the namespace std here I'll give a message

04:00see out may I know your name then seen name so str is a variable name then see

04:14out hello a space here so that space is there in between hello and name of a

04:26user I'll run the program may I know your name let us say name is John so

04:37hello John it's working I'll run it once more I'll give the name Sai Kumar

04:46let us see what happens it's giving just Sai here it's not giving the other name

04:54because the name is having two words here it's reading only one word if I

04:59want to read all the words entered in a string then the right method is there's

05:07a function available called get line get line takes input stream that is seen

05:13and next is string variable string object now let us read it using get line

05:21this is the method for reading an entire line from the keyboard may I know your

05:30name so Sai Kumar now I got a full name Sai Kumar that's it so this is a way you

05:40can access the strings whenever you require there's a built-in object

05:43available in C++ and it's a very useful object

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