Answer / vikas thakur

<stdio.h> is a header file (sometimes called include file).
This is a library file of C language. To make
understandable to the compiler as a library file and to
make search it in library, it is writtrn as <stdio.h>.

"stdio.h" is a user defined header file.

Answer / paritosh

without predirector "<>",stdio.h is just like a variable name...

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