General Format

General Format of C Program

  Preprocessor command
  Global Declaration
  main()
  {
    Local Declaration
    statements
    ----------
    ----------
    return value;
  }
  Additional Functions
  .......

Preprocessor command

• These are the instructions which we want to give to our compiler (Its Preprocessor).
• They indicate how the program is to be compiled.
• A Preprocessor command starts with symbol '#'.
• for e.g.:
  1. #include
  2. #define
  3. #ifdef..

Global Declaration

• In this section we can define different type of programming elements such as Variables, Constants etc.
• Programming elements defined in this section can be accessible throughout the program.

Function Main

• It is the entry point of our program.
• Execution of our program begins with function main.

Local Declaration

• In this section we can define different type of programming elements such as Variable, Constants etc.
• Programming elements defined in this section are accessible only within the function in which they are defined.

Statement

• These are set of instructions which we want to give to our system to perform some task.

return statement

• Return statement within function main is use to return the control to operating system.
• return value indicate how the program is terminated i.e. normally or abnormally
  • return 0 - normal termination
  • return 1 - abnormal termination
• Note: return statement is optional