Lecture 2: Write Your First Program in C++
CodeHelp - by DIVYANSHU
This is the 2nd lecture of our DSA series. We will see how a
program runs and what does each line mean in this lecture.
This is how the compilation process work So it is compiler
which makes it possible for us to run a source code. Coding
Ninjas has supported us in providing this amazing DSA course
to you. Courses are available in both Hindi and English. you
need an IDE to write, run and execute a code. There are many
IDEs out there - CodeBlocks, VsCode and many more - which
you do n't even need to install Replit is one of them. You can
directly create a C++ there and run it using Replit. In C++,
many namespaces are there which have cout functions in them
so if we want to use cout , we have to add this file to our code.
We use these signs to output the result into standard
namespace. If you will use > > by mistake by mistake, then it
will give you compilation error So we use this operator to
display output.
We are going to talk about data types and variables. Whenever
you have to story any information or data in the memory. You
have to mention what type of data it is and how much memory
it will take. For eg- int a = 5, a is a variable in memory which is
of int type and it has value 5 in it. We have certain rules which
we have to follow when we are giving names. There is a
function named sizeof , which will tell you about the space
being used by any variable. In memory, first 29 bits will have 0,
and last 3 bits will be 101, so in memory the first 29 bit will
have 0 and the last 3bits will have 101. We have a way to story
multiple characters but we will see that in upcoming lectures.
In c++, all the characters are mapped to some ASCII value in
memory. We will just store binary form of ASCII value of any
character. If we have 4 different bytes with some binary value,
how will compiler know whether it is a single Int value of 4
separate char values ? Compiler will come to know from data
types which we used when we declared any variable. This
process of converting one data type into another is known as
type casting.
There are few steps which I have to follow while storing a
negative number. Let 's say the number is -5 1st - Ignore the
negative sign 2nd - Convert into binary representation = 101
CodeHelp - by DIVYANSHU
This is the 2nd lecture of our DSA series. We will see how a
program runs and what does each line mean in this lecture.
This is how the compilation process work So it is compiler
which makes it possible for us to run a source code. Coding
Ninjas has supported us in providing this amazing DSA course
to you. Courses are available in both Hindi and English. you
need an IDE to write, run and execute a code. There are many
IDEs out there - CodeBlocks, VsCode and many more - which
you do n't even need to install Replit is one of them. You can
directly create a C++ there and run it using Replit. In C++,
many namespaces are there which have cout functions in them
so if we want to use cout , we have to add this file to our code.
We use these signs to output the result into standard
namespace. If you will use > > by mistake by mistake, then it
will give you compilation error So we use this operator to
display output.
We are going to talk about data types and variables. Whenever
you have to story any information or data in the memory. You
have to mention what type of data it is and how much memory
it will take. For eg- int a = 5, a is a variable in memory which is
of int type and it has value 5 in it. We have certain rules which
we have to follow when we are giving names. There is a
function named sizeof , which will tell you about the space
being used by any variable. In memory, first 29 bits will have 0,
and last 3 bits will be 101, so in memory the first 29 bit will
have 0 and the last 3bits will have 101. We have a way to story
multiple characters but we will see that in upcoming lectures.
In c++, all the characters are mapped to some ASCII value in
memory. We will just store binary form of ASCII value of any
character. If we have 4 different bytes with some binary value,
how will compiler know whether it is a single Int value of 4
separate char values ? Compiler will come to know from data
types which we used when we declared any variable. This
process of converting one data type into another is known as
type casting.
There are few steps which I have to follow while storing a
negative number. Let 's say the number is -5 1st - Ignore the
negative sign 2nd - Convert into binary representation = 101
