What is C? It is a programming language developed at AT & T’s Bell Laboratories of USA in 1972. It is designed and written by Dennis Ritchie. C is a general-purpose language which has been closely associated with the UNIX operating system for which it was developed - since the system and most of the programs that run it are written in C. The evolution of C took place in the following way: Why should we use C? 1.C language is a building block for many other currently known languages. 2.There are only 32 keywords in ANSI C and its strength lies in its built-in functions. Several standard functions are available which can be used for developing programs. 3.C language is a structured programming language. This makes user to think of a problem in terms of function modules or blocks. Collection of these modules makes a complete program. This modular structure makes program debugging, testing and maintenance easier. What is ANSI C? 1.ANSI C, ISO...