Page 86 - Viva ICSE Computer Studies 8 : E-book

First Step: An initialisation happens fi rst and only one time, which means that the initialisation
part of the loop only executes once.
Second Step: Condition in For loop is evaluated on each iteration. If the condition is true
then the statements inside the For loop body get executed. Once the condition returns false,
the statements in the For loop do not execute and the control gets transferred to the next
statement in the program after the For loop.

Third Step: After every execution of For loop’s body, the increment/decrement part of For loop
executes that eventually updates the loop counter.
Fourth Step: After the third step, the control jumps to the Think and Discuss
second step and the condition is re-evaluated.

Example: Write a program to print the even numbers What is the unique feature of
For loop?
between 1 and 10.

While Loop

While loop statement in Java programming language repeatedly executes a target statement
as long as a given condition is ‘True’. It initially tests the condition before executing the loop
body. The condition can be any Boolean expression. While loop is a condition controlled loop.
The loop will continue executing till the test condition is ‘True’. The control terminates when
the test condition is ‘False’.

Let’s understand the While loop with the syntax and an example.

Syntax: Test
condition
While(test condition)
{ If condition is
………… true

Statements Code block If condition
statements
} is false

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