Introduction to C
C is a general purpose high-level language developed by Dennis Ritchie and Brain Kernighan at AT&T Bell Laboratories of USA in 1972. Originally it was designed to run on a PDP-11 under UNIX operating system. C was influenced by two related languages BCPL and B. Although it was originally intended to run under UNIX, there has been a great interest in running it under MS-DOS on IBM-PC. Many high-level languages like Pascal are highly disciplined and structured. C is much more flexible and free-wheeling. This freedom gives C much more power that experienced users can employ.
C has been a popular language due to its simplicity of expression, the compactness of the code, extensive use of function calls and the wide range of applicability. C is cryptic in nature. It allows the programmer a wide range of operations from high-level up to low-level.
Structure of a C Program
A, C program basically has the following structure.
- Pre-processor commands
- Type definitions
- Function prototypes
- Variables
- Functions
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