Page 199 - ComputerScience_Class_11

Each looping structure contains four parts:
• Starting value/initialisation
• Test condition
• Increment or decrement (also known as step value)
• Body of the loop
Let us take an example:

int i;
for(i=1; i<=10; i=i+2)

{
System.out.println(i);
}
Here,

• Starting value → i=1;
• Test condition → i<=10;
• Increment → i=i+2
• Body of the loop → System.out.println(i);
There are two types of loops based on the nature of repetition which are as follows:
1. Fixed Iteration Loop: Fixed type of iterative loop repeats the process for a defined number of times.
For example, for loop
2. Unfixed Iteration Loop: Unfixed type of iterative loop repeats the process till a given condition is true.
For example,
• while loop
• do-while loop

There are two types of loops based on the condition which are as follows:
1. Entry Controlled Loop: If the test condition is checked before executing the body of the loop, then it is called an
entry controlled loop. For example,
• for loop
• while loop
2. Exit Controlled Loop: If the test condition is checked after executing the body of the loop, then it is called an exit
controlled loop.
For example,
• do-while loop

The for Loop
The Java for loop executes a set of statements repeatedly for a fixed number of times.
As soon as the control statement does not match the condition, the loop terminates.
The syntax of for loop is:

for (initialisation; test condition; increment or decrement)
{
// body of the loop
}

Statements and Scope 197