Not part of the standard C-library, so you have to contact its developer.
Include the header file math.h and use the function acos(d)
Java does not require header files like C/C++.
Constants, typedefs, function prototypes. If you want to know more, load it into a text editor.
Platform dependent, possibly LIBC.LIB or something like that.
just as you do it in C.
No predefined 'header' function in the standard C libraries. There are header files, if that's what you mean.
list of header files in c and function prototype associated with each file
to include the header files.
It's 1405 in my Linux box.
Look for typedef in it, but I don't think you will find any.
You do not need a header file to add two numbers in C. You do need the header files if you want to use the run-time library, which includes the ability to format and display the result.
Rephrase your question so it is comprehensible.
None, but there are some predefined defines, like __STDC__
Include the header file math.h and use the function acos(d)
Java does not require header files like C/C++.
int86 is a function in TurboC, header dos.h, consult the built-in help.
Windows h is a header file for the programming language C++. If one were looking to learn about this specific header file there are forums that exist specifically for this topic on the C plus plus help page.