What is stdin in C?

Question

I want to create my own scanf function. The main idea is data from a memory address and storing it at another memory address.

What is stdin? Is it a memory address like 000ffaa? If this is a memory address, what is it, I can create my own scanf function. Thank!.

Answer 1

No, stdinit is not a "memory address".

This is an input / output stream, basically an abstraction of the operating system level, which allows you to read data (or write in case stdout).

To read from a stream, you need to use the correct stream I / O functions.

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int my_scanf(int (*getchar_callback)(void *state), void *state, const char *fmt, ...);

. state - , getchar_callback() my_scanf().

Answer 2

stdin - " ", , . , -. - .

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Answer 3

Unix

https://en.wikipedia.org/wiki/Everything_is_a_file

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unix /dev/stdin, /dev/fd/0,