The do-while loop is a control flow statement in Java that is similar to the while loop, but with a slight difference in its execution. The basic syntax of a do-while loop in Java is as follows:
do {
statement(s);
} while (condition);
The difference between a do-while loop and a while loop is that the statements inside a do-while loop are executed at least once, even if the condition is false. The condition in the do-while loop is a boolean expression that is evaluated after each iteration of the loop. If the condition is true, the loop will continue to execute; otherwise, it will exit the loop.
For example, the following do-while loop will print the numbers from 1 to 10:
int i = 1;
do {
System.out.println(i);
i++;
} while (i <= 10);
The do-while loop is useful when you want to execute the statements inside the loop at least once, even if the condition is false. For example, consider a scenario where you want to keep asking the user for input until they enter a valid number. You can use a do-while loop to achieve this:
Scanner sc = new Scanner(System.in);
int number;
do {
System.out.print("Enter a number: ");
number = sc.nextInt();
} while (number < 0);
In conclusion, the do-while loop in Java is a control flow statement that is similar to the while loop, but with a slight difference in its execution. The statements inside a do-while loop are executed at least once, even if the condition is false. The do-while loop is useful in scenarios where you want to execute the statements inside the loop at least once, but with a certain condition that needs to be met in order to continue the execution. Understanding when and how to use do-while loops is an important aspect of programming in Java.
