How to make 2 functions : "printf" and "scanf" in C ??

[Zerozone]

I mean : How can C write these functions... I would like to know it, so you can show me where can I find about this infomation ?

[smalpani]

I mean : How can C write these functions... I would like to know it, so you can show me where can I find about this infomation ?

first try if you do getchar(c) and putchar(c)

rest is easy

[oler1s]

Certain compilers are open source. gcc is pretty well known. Have you looked at any source code?

[sicarie]

smalpani-

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Thanks,

sicarie