Implemenatation of Printf

[Sandeep Chikkerur]

Hi,

How printf is implemented ?
i.e, when we use printf, what goes inside to actually print the
charecters to the console ?


Thanks
Sandeep

 

[hari4063]

It depends from lib to lib, but mostly printf will call some helper
function like vfprintf that can print to file. So printf can just call
this with stdout. Now Your question will be how that helper function is
implemented? Who knows, look at lib source if yours compiler provide this
(gcc, borland, vc++ have sources for lib, so look at source).

Best,
Zaharije Pasalic

 

[ankisharma]

you can look at the section 7.2 of K&R( if you don't have the book then
I can paste that section for you). It has minimal implementation of
printf. But if you want to look at the implementation of this function
in your library then you have to dig out the source for this.

 

[Ravi Uday]

Hi,

How printf is implemented ?
i.e, when we use printf, what goes inside to actually print the
charecters to the console ?


Thanks
Sandeep

See FAQ: 18.13 @
http://www.eskimo.com/~scs/C-faq/top.html

to know more about C-libraries

- Ravi

 

[marlaque]

Hi,

How printf is implemented ?
i.e, when we use printf, what goes inside to actually print the
charecters to the console ?


Thanks
Sandeep

If you have access to gcc then you can also poke around and find the
source to this one implementation. As others have already said, there's
no guarantee that all compilers will implement the same methedology.