C is a general purpose programming language. C was developed by AT & T’s Bell Laboratories of USA in 1972. It was designed and written by Dennis Ritchie.  For Example

#include <stdio.h>
void main()
{
   printf("Hello, World!");
}
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  C++ is an extension or superset of C language. C++ programming language was designed and developed by Bjarne Stroustrup at AT&T BELL labs in 1980. C++ is an intermediate level language, as it comprises a confirmation of both high level and low level language features.  For Example

#include <iostream.h>
void main()
{
   cout << "Hello, World!";
}
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  Operating System is the system software which provides the interface between the users application and the computer hardware and controls and manages the overall resources of computer.  For Example

dir
cd
cd..
md
deltree
etc.......
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