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

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