How to include a single or few assembly instructions in the c program without using function call?
My problem is, in assembly language we can make use of the org directive to set the origin address of the program to a particular address location in program memory but how to achieve the same using c?
No, that's not actually your problem. Your problem is that you're trying to program C as if it was exactly the same as assembler. Well, it's not ... and if it were, there would be no point in even having C.
Just because you can (or even must) do something in assembly doesn't mean you have to do it in C, too.