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Lecture 2: Write Your First Program in C++
This is the 2nd lecture of our DSA series
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This is how the compilation process work So it
is compiler which makes it possible for us to run a source code
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Courses are available in
both Hindi and English
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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
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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
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If you will use > > by mistake by
mistake, then it will give you compilation error So we use this operator to display
output
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Whenever you have to story
any information or data in the memory
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For eg- int a = 5, a is a variable in memory
which is of int type and it has value 5 in it
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There is a function named sizeof , which will tell
you about the space being used by any variable
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We have a way to story multiple characters but we will see that
in upcoming lectures
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We will just store binary form of ASCII value of any character
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This process of converting one
data type into another is known as type casting
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Let 's
say the number is -5 1st - Ignore the negative sign 2nd - Convert into binary
representation = 101 3rd - Take 2 's complement and store it Now we can store
negative numbers simply too, by just using their first bit as their sign
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2/5 will give 0 and
not 0
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To get answer
in float, store it in a float variable
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logical operators have & &
and & is used to check multiple conditions
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We know what things to keep in mind while dividing , how to store
negative numbers & & operators and ! operators
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We will do Bitwise operators later