C-Programming: Structure of a C Program

' $
PDS: CS 11002 Computer Sc & Engg: IIT Kharagpur 1




Structure of a C Program


• A program in C language is a collection of
functions and declarations. It also have C
preprocessor (cpp) directives.
• A function named ‘main()’ is mandatory.



& %
Lect 2 Goutam Biswas

, ' $
PDS: CS 11002 Computer Sc & Engg: IIT Kharagpur 2




C Function


• A function definition in C language has
– a name,
– a list of formal parameters (optional),
– type of the value it returns (if any),
– local variable declarations (if any), and
– a sequence of statementsa .
a There may be comments for better human understanding.

& %
Lect 2 Goutam Biswas

, ' $
PDS: CS 11002 Computer Sc & Engg: IIT Kharagpur 3




An Example with Three Functions




& %
Lect 2 Goutam Biswas