Functions & Procedures [7]

Programming & Algorithm Functions & Procedures August 17, 2006

What Is a Function?

What Is a Function?
A function is a named , independent section of code that performs a specific task and optionally returns a value to the calling program .

How a Function Works
E.g.:
PROGRAM function_illustration
KAMUS
function quadrate (x: integer) -> integer
a, result: integer
ALGORITMA
input(a)
result ← quadrate(a)
output(result)
function quadrate (x: integer) -> integer
KAMUS LOKAL
ALGORITMA
-> x*x

How a Function Works

Writing a Function
: PROGRAM function_illustration
:
: KAMUS
: function quadrate (x: integer) -> integer
: a, result: integer
:
: ALGORITMA
: input(a)
: result ← quadrate(a)
: output(result)
: {---------------------------------------------------------------------------------------------------------------}
: function quadrate (x: integer) -> integer
:
: KAMUS LOKAL
: value: integer
:
: ALGORITMA
: value ← x * x;
: -> value;

Writing a Function
The function components:
The Function Header [Line 12]
The Function Return Type
The Function Name
The Parameter List
The Function Body [Lines 18-19]
Local Variables [Line 15]
Function Statements [Lines 18]
Returning a Value [Lines 19]

Recursion
The term recursion refers to a situation in which a function call itself either directly or indirectly.

Exercises
Create a program that inputs three integers and displays the average of them on screen. The program uses a function named average().
Create a program that inputs one integer (N) and display the words “I love C” N times. The program uses a procedure named I_love_C().

Exercises
Create a program that inputs one integer (N) and displays the factorial of N on screen. The program uses a function named factorial().
Create the program number 3 using a recursive function named rec_factorial().

Functions & Procedures [7]

by ecko_disasterz on Jan 29, 2009

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Functions & Procedures [7] — Presentation Transcript