It is a letter and function it.
The main function defines the entry point of an application in C.
There is no such term as "building function" in C++.
I don't use that function in C programme.
The c language does not have template functions. That is a c++ thing.
in c main function initailly called by operating system.
if you do not used main function in c program when errors are accrued
Yes. It is the function f(x) = c where c is a constant.
A function of the form f(x) = mx + c where m and c are constants is linear.
Yes. Examples can be found in stdio.h
No objects in C. For C++, it is destructor.
libray in c++
Yes