Page 204 - ComputerScience_Class_11

Difference Between for Loop and while Loop
The difference between for loop and while loop is given below:

For Loop While Loop
In the for loop, all the parameters (i.e., initialisation, In the while loop, the parameters (i.e., initialisation,
test condition and increment or decrement) are in test condition and increment or decrement) are
the same line. written in separate lines.
This loop is used to execute a set of statements This loop is used to execute a set of statements
repeatedly when the number of iterations is known. repeatedly when the number of iterations is not known.
This loop is more concise and suitable for simple This loop provide more flexibility when dealing with
iteration. complex loop conditions.

Nested Loop
When a loop is present inside the body of another loop, it is called a nested loop. It is also called loop inside loop.
The syntax of a nested loop:
Outer loop structure
{
Inner loop structure
{
Statements inside inner loop
}
Statements inside outer loop
}
Since all types of loops can have nested loop, the three types of nested loops are as follows:
• Nested for loop: The for loop inside another for loop is called a nested for loop.
For example:

Program 7 Write a Java program that uses nested for loops to print the following pattern:
2
4 4
6 6 6
1 import java.util.Scanner;
2 public class NestedForLoop {
3 public static void main(String[] args) {
4 int i;

5 int j;
6 for(i=1; i<=3; i++)
7 {
8 for(j=1; j<=i; j++)
9 {
10 System.out.print(i*2);

11 }
12 System.out.println();
13 }
14 }
15 }

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