What is padding in C?

In C what is meant by padding of bits? Consider the following structure,

struct number {
int a;
char b;
int c;
};


What is the size of this structure? An integer takes 4 bytes, char takes 1 and the third integer 4 bytes. Total 9 bytes. This is wrong. We can see the size of the structure is 12 bytes. What happens here? the compiler pads 3 bytes to char element. This is for proper alignment. In a 32 bit processor it checks the next data only after 32 bits. Else the compiler will have related problems. Now the compiler knows each data is 4 bytes wider. So the benefits.

Author: Abhilash

Hey! This is Abhilash - Ruby developer, specialised on web development. Experienced with frameworks such as Rails, Angular, Sinatra, Laravel, NodeJS etc. I am working on Ruby on Rails platform since 2010. This blog is about Ruby, Ruby On Rails and other subjects that I have had experienced with. You can contact me here: abhilash.amballur@gmail.com LinkedIn: www.linkedin.com/in/abhilashak

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