30-12-24
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Q)What do you know about iteration statements in Java.
    =>Whenever any task performing code is required to be executed
    repeatedly, we go for iteration statements.
    =>There are 4 repetetion/looping/iteration statements in Java
            1)for statement
	    2)while statement
	    3)do while statement
	    4)enhanced for statement(for each statement)
Q)Explain about for statement(for loop)
   =>For statement has 4 parts.
       1.)Loop counter initialization
       2.)condition
       3.)body
       4.)loop counter updation(incrementation/decrementation)
Note:- A variable used in condition is known as a loop counter.

=>Loop counter initialization happens only once.
=>Condition is verified  'n' number of times.
=>As long as the condition is true, body is executed repeatedly.

FLOW CHART
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Q)Java program to print first 10 natural numbers using for loop,while loop and do while
loop.
class OneToTen{
	public static void main(String[] args){ 
		for(int i=1;i<=10;i++){
		    System.out.println(i);
		}//for
	}//main
}//class
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class OneToTen{
	public static void main(String[] args){
		     int i=1;//loop counter initialization
		     while(i<=10){
		         System.out.println(i);
		         i++;
		     }//while
	}//main
}//class
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Q)When to use for loop and when to use while loop?
  =>There is no hard and fast rule about which loop to use. We can use
  any loop to solve repetetion problem.

  =>Whenever repetetion is for a fixed number of times, we better go for
  for loop for coding convenience.

 =>If we don't know in advance how many repetetions are required to
 solve the given problem, we go for while loop.
Q)What are the things to know to solve a computing problem?
     1)IPO
     2)flow control structure to be used
Q)Java application to find the sum of the digits of a number.
import java.util.Scanner;
class SumOfDigits{
	public static void main(String[] args){
		Scanner scanner=new Scanner(System.in);
		System.out.println("Enter a number:");
		int n=scanner.nextInt();
                int sum_of_digits=0,remainder;
		while(n>0)	{
                        remainder=n%10;
			sum_of_digits=sum_of_digits+remainder;
			n=n/10;
		}//while
		System.out.println("The sum of the digits is "+sum_of_digits);
	}//main
}//class