do-while Loop in Java

do-while loop is an Exit control loop. A do-while check the condition after executing the statements or the loop body.

Syntax:

 do
{
    // loop body
    
    update_expression
}
while (test_expression);

Flow Chart

How does a do-While loop flow executes?

Control falls into the do-while loop. .
The statements inside the body of the loop get executed.
Updation takes place.
The flow jumps to Condition
Condition is tested.
- a) If Condition yields true, goto Step 6. .
- b) If Condition yields false, the flow goes outside the loop
Flow goes back to Step 2.

Example1: Table Print

 public class DoWhileEx {  
public static void main(String[] args) {  
    int i=1;  
    do{  
        System.out.println(i);  
    i++;  
    }while(i<=5);  
}  
}  

Output

Example2: We are going to enter number = 4. It Work this Program, total = 4 + 3 + 2 + 1 = 10

 import java.util.Scanner;

public class DoWhileLoopEx {
	private static Scanner sc;
	
	public static void main(String[] args) {
		int number, sum = 0;
		sc = new Scanner(System.in);	
		
		System.out.println("\n Please Enter the any integer Value below 10: ");
		number = sc.nextInt();
		
		do  {
			sum = sum + number;
			number--;
		} while (number > 0); 
		System.out.format(" Sum of the Numbers From the While  Loop is: %d ", sum);
	}
}

Output

It Work this Program, total = 4 + 3 + 2 + 1 = 10

Example3 : Java program to print numbers from 1 to N using do while loop.

import java.util.Scanner;
 
public class PrintNumbers
{
    public static void main(String args[]){
        int loop; //declaration of loop counter
        int N; 
         
        Scanner SC=new Scanner(System.in);
         
        System.out.print("Enter value of N: ");
        N=SC.nextInt();
         
        loop=1;
        do{
            System.out.print(loop +" ");
            loop++;
        }
        while(loop<=N);
         
    }
}

Output

Print N Number using DoWhile Loop in Java

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do-while Loop in Java

How does a do-While loop flow executes?