Basic Structure of a C Program

#clanguage #cprogramming Basic Structure of a C Program:- • A C program is divided into six sections: Documentation, Header File, Definition, Global Declaration, Main( ) Function, and User Defined Functions. • While the main section is compulsory, the rest are optional in the structure of the C program. Comment Section or Documentation Section Header File Section or Preprocessor Directive Section or Linking Section Definition Section Global Variable Declaration Section main( ) { Declaration Part Execution Part } User_Defined_Function( ) { Function body } 1.Comment Section or Documentation Section • Comments are useful for understanding the program. • It Consists of the description of the program such as programmer's name, and creation date. • Comments can be placed anywhere in the program. • In a C program, single-line comments can be written using two forward slashes i.e., //, and we can create multi-line comments using /* */. • i.e., Multi line Comment begins with /* and ends with */ (Forward Slash and Asterisk symbol. • // add.c • Ex: sum=a+b • /*add a and b and store the result in sum */ • Comments are not compiled and not executed. 2. Header File Section or Preprocessor Directive Section or Linking Section:- • Any header file is a collection of library functions. • Ex:- #include stdio.h , #include string.h , #include conio.h • Library functions are already defined in the compiler. • printf( ) , scanf( ) functions are available in stdio header file. • Extension for header file is .h. • The statements which are executed before compilation are known as pre-processor directives. • A copy of these header files is inserted into your code before compilation. • Linker links object code of several library functions to the main program. 3. Definition Section:- • It is used to define Symbolic Constants or Macros. • Ex: #define PI 3.14 • Once we declare a Symbolic Constant then it is not possible to change its value. • If we try to change macro value, then compiler gives error message. 4. Global Variable Declaration Section:- • Global Variables are used anywhere in the program • If we declare a variable above main( ) , then it is called as Global Variable. 5.main function( ):- • Any C Program is a collection of functions. • Any C Program must contain one function i.e., main function. • The execution of C Program must always start from main( ). • main( ) mainly contains 2 parts. • 1. Declaration Part 2. Execution Part main( ) { Declaration Part Execution Part } • During declaration part, we can declare variables. • Execution part is used for calculations, displaying results. 6.User Defined functions or sub program :- • The functions which are defined by the user. • Any function contains a block of statements which performs given task. #BasicStructureofaCProgram #StructureofCProgram #CProgramStructure explain the basic structure of c program with an example pdf, basic structure of c program pdf, basic structure of c program wikipedia, structure of c program with example pdf, basic structure of c program ppt, structure program for student details in c, general structure of c program, basic structure of c++ program