What are the parts of a C program?

Answer 1

C programs are primarily composed from functions and data types. The global main function serves as the entry point to the application. In most cases, the main function will simply process the command line switches before passing control to the appropriate function(s). A program (normally) ends when the main function returns, however abort() or exit() function calls can end a program prematurely. This is typically done when an unrecoverable error occurs. All resources consumed by the program are automatically released when the program ends, however programs should always explicitly release resources as soon as they are finished with them.

Data types are composed from primitive built-in types such as int, float and char. User-defined types are created using data structures (struct), unions.