it is used to confuse people.
An extension cord holder is used to hold an extension cord. It wraps around the holder, for easy release and withdrawal.
An Extension Cord Holder having side members connected by a center section which is shorter than the side members so as to provide a cord receiving space therebetween at opposite ends of the center section, the center section preferably has curved ends to facilitate the winding of the extension cord about the center section, and a handle is connected to one side member for carrying the Extension Cord Holder.
The extension of c program is ".c".
ls *.c
from the extension of your file.If it has an extension of .cpp then it is a c++ programIf it's extension is .c, then it is a C program.
how to know a/c holder name by a/c number
for c language it is .c and for c++ it is .cpp
C++ Extension Name is... Syntax is: File Name.extension name. Ex: ankit.cpp
Most C programmers use a .c file name extension for executable C source code, and .h or no filename extension at all for source files containing definitions and interface specifications, so-called header files.Some C compilers inspect the file name extension and draw conclusions, but most will accept almost any filename convention.Other common filename extensions used in the C family of programming languages are .cpp and .hpp (C++) and .cs (C#). On operating systems with case-sensitive file names, these extensions are generally expected to be in lower case.
how to know a/c holder name by a/c number
The .cpp extension is merely conventional; it is not required by the C++ standard. You can actually use any file extension you wish.
Convention. Of course you can use any other extension, like 'helloworld.my-own-c-source' instead of 'helloworld.c' but why should you?