003 - FUNCTIONS

• Functions

  • A group of statements that perform a task.
• THREE ELEMENTS OF FUNCTION

  • Function Prototype (Declaration)
  • Function Definition
  • Function Call
• Function Prototype / Declaration

  • An element of a function that tells the compiler about a function's name, return type, and parameters. (how to call the function)
• Function Definition

  • Provides the actual body of the function.
• A function can also be referred as a method or a sub-routine or a procedure.
• Return Type

  • The data type of the value the function returns.
• Return Type

  • A function may return a value.
• A function definition in C programming consists of a function header and a function body.
• Function Name

  • This is the actual name of the function.
• Parameter

  • Also known as a placeholder.
• Parameter List

  • Refers to the type, order, and number of the parameters of a function.
• Function Body

  • Contains a collection of statements that define what the function does.
• Function Call

  • Function Execution in the main program.
• TWO TYPES OF FUNCTION BY DEFINITION

  • Built-In Function / Pre-defined Function
  • User-Defined Function
• Built-In Function / Pre-defined Function

  • Functions that are already provided by the C programming language itself or by standard libraries.
• User-Defined Function

  • Defined by the user himself to perform some specific tasks.
• FUNCTION ARGUMENTS

  • Formal Parameters
  • Call Parameters