Q.Write ten basic structure of C programming (overview).

A well-formed C program is built from a standard set of parts, in a definite top-to-bottom order, of which only main() is compulsory.

[!ANSWER]

The basic building parts (overview) are: (1) documentation/comments, (2) preprocessor #include directives, (3) #define definition section, (4) global declarations, (5) the main() function header, (6) opening/closing braces of main(), (7) local declaration part inside main(), (8) executable statement part, (9) user-defined function (subprogram) section and (10) the return statement.

[!TLDR]

An overview of a C program's structure covers documentation, preprocessor and definition sections, global declarations, main() with its braces, declaration and statement parts, subprograms and the return statement.

The overall structure of a C program can be described through its basic parts, written in the following order:

1. Documentation section - opening comments giving the title, author and purpose.
2. Preprocessor / link section - #include directives that attach the required header files.
3. Definition section - #define directives that create symbolic constants and macros.
4. Global declaration section - variables and function prototypes shared by all functions.
5. main() function header - main(), where execution begins.
6. Braces { } - mark the start and end of the function body.
7. Declaration part - local variables declared at the top of the body.
8. Executable statement part - the input, processing and output statements, each ending with a semicolon.
9. Subprogram section - user-defined functions written before or after main().
10. return statement - returns a value/control to the operating system.

A general skeleton:

/* 1. documentation */
#include <stdio.h>      /* 2. preprocessor */
#define PI 3.14         /* 3. definition */
int g;                  /* 4. global declaration */
int main()              /* 5. main header */
{                       /* 6. opening brace */
    int a, b;           /* 7. local declaration */
    /* 8. executable statements */
    return 0;           /* 10. return */
}                       /* 6. closing brace */
/* 9. user-defined functions here */

[!ANSWER]

The program is structured as documentation, preprocessor directives, definition section, global declarations, the main() function with its braces, local declarations, executable statements, user-defined functions and a return statement - only main() being compulsory.