What is malloc

"Malloc" is a function in the C programming language that programmers use to ask the computer for a certain amount of memory that they can use in their program.

Here's how it works, step by step:

1. First, the programmer decides how much memory they need. This could be for storing a number, a character, or something more complex like an array or a structure.

2. Then, they use the "malloc" function to ask the computer for this amount of memory. They do this by writing "malloc(size)", where "size" is the amount of memory they need. This is like going to a store and asking for a box of a certain size.

3. The "malloc" function then talks to the computer's operating system, which keeps track of all the memory in the computer. It's like the store clerk who knows where all the boxes are kept.

4. If the operating system has enough free memory of the requested size, it reserves that memory for the program to use and gives "malloc" the address of that memory. This is like the store clerk giving you the box you asked for and telling you where it is.

5. The "malloc" function then returns this memory address to the program. The program can now use this memory for storing its data. This is like you taking the box home and putting your stuff in it.

6. If the operating system doesn't have enough free memory of the requested size, "malloc" returns a special value called NULL. The program should check for this to make sure it got the memory it asked for. This is like the store clerk telling you they're out of the size of box you wanted.

Remember, when the program is done using the memory it got from "malloc", it should use the "free" function to give it back to the operating system. This is like returning the box to the store when you're done using it, so someone else can use it.