referring to ANSI C book by K and R
"With a little care it is easy to write portable programs, The standard makes portability issues explicit"
I expects, he hints me, that the C language <without the standard library> , is portable and, if I dont use the std. library, my program is guarenteed to run over any system.
but how can I write a program without the std. library, when even writing a simple Hello World program requires stdio.h library?