Learnings of the Week - October 18, 2008

ITERATIVE STATEMENTS

Iterative Statements (loops) allow a set of instruction to be executed or performed several until condition are met. It can be predefined as in the loop, or open ended as in while and do-while.


The For Statements

- is considered as a predefined loop because the number or times it iterates to perform its body is predetermined in the loop’s definition

- contains a counter whose values determine the number of times the loop iterates. The iteration stops upon reaching the number of times specified in the loop

- for is a reserve word in C

- initialization is an assignment statement that is used to set the loop’s counter

- condition is a relational Boolean expression that determines when the loop will exit

- increment defines how the loop’s counter will change each time the loop is separated

- statement sequence may either be a single C statement or a block of C statements that make up the loop body

- the for loop continues to execute until the condition is True (1)

- once False (0), program execution resumes on the statement following the for loop


The While Statement

- is an open-ended or event-controlled loop

- the while loop iterates while the condition is TRUE (1)

- when it becomes FALSE (0), the program control passes to the line after the loop code

- while is a reserved word in C

- condition is a relational expression that determines when the loop will exit

- Statement_sequence may either be a single C statement or a block of C statements that make up the loop body


The Do-While Statement

- the second type of open-ended or event-controlled loop

- while and do are reserved words in C

- condition is a relational expression that determines when the loop will exit

- Statement_sequence may either be a single C statement or a block C statements that make up the loop body

- Is a variation of the while statement which checks the condition at the bottom / end of the loop

- This means that “always executes at least once”

- When the condition evaluates to TRUE (1), the loop body will be executed, but when FALSE (0), program control proceeds to the next instruction after the do-while loop



Posted by:
RAE ANGELINE S. PALEN