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In programming, there are often times when you have a repetitive task that you want to do multiple times. Loops are used to automate these repetitive tasks and allow you to create more efficient code.
do ... while loops in Java, they are used to execute a block of code as long as a specific condition is met. These loops are similar to
if conditional statements, which are blocks of code that are only executed if a specific condition evaluates to true. Unlike a
if statement, however,
while loops are executed until a condition is no longer true.
This tutorial will discuss the basics of
do ... while Java instructions and some examples will be presented to demonstrate these instructions in a Java program .
while Loops through a block of code until a specified condition is true. The syntax of the
while loop is similar to that of a so traditional
statement. Here is the Java syntax
while will test the expression, in parentheses. If the boolean expression evaluates to true, the body of the loop will be executed, the expression will be evaluated again. The program will continue this process until the expression evaluates to false, after which the
while is canceled and the rest of the program will be executed.
Let’s illustrate an example to show how the
while loop can be used in Java. Let’s say we are a carpenter and we decided to start selling a new table in our shop. We only have the option of creating five tables, after which people who want a table will be placed on a waiting list.
We want to create a calendar that tells us how many people can order a table in advance. to put them on the waiting list. We could do this using a
while loop like this which will run the body of the loop until the number of commands passed is below the limit:
Our code returns:
Downtime break our code. In the first line we declare a variable called
limit which keeps track of the maximum number of tables we can create. Next, we declare a variable called
orders_made which stores the number of orders placed
Our program runs then a
while loop, which is executed while
orders_made is less than
limit. So, we use the
orders_made ++ increment operator to add 1 to
After the increment operator has been executed, our program calculates the remaining capacity of the tables by subtracting "
limit. Then print the message
[capacity] you can sort multiple tables. on the console.
Our "while" statement stops working when
orders_made is greater than
Java Do While
do ... while loop is a type of
do .. while loop executes the block of code in
do once before checking if a state ion evaluates to true. Then the program will repeat the loop as long as the condition is true.
The difference between
do ... while loop is that
while loops evaluate state before execute the code in the
while block, while do ... while evaluate the state after. by executing the code in the
the syntax of the do ... while loop is as follows:
we are using a example to explain how to do it ... everything works in a loop.
Suppose we create a puzzle that asks a user to guess a number between one and ten. We want our user to first be prompted for a number before checking to see if they have guessed the correct number. If the user enters the wrong number, they should be promoted to try again. We could do this using a do ... while loop.
Here is an example of a program that asks a user to guess a number, then evaluates whether the user has guessed the correct number using a do ... loop:
When we run our code, we are asked to guess the number prime , before the condition in our
do ... while cycle is evaluated. Here’s what happens when you try to guess a few digits before finally guessing the correct one:
Pause of Descended our code. First, we import
util.Scanner, which is used to collect user input. Next, we define a class called
GuessingGame in which our code exists
we then define two variables: a name
number which stores the number to guess, and another name
guess which stores the users guess.
Next, we use the scanner method to start user input . We print the message
Enter a number between 1 and 10: on the console, then use the
input.nextInt () to retrieve the number that the user entered < br>.
After this code has been executed, the do ... while loop evaluates whether the number the user guessed equals the number the user must guess. If the user guessed the wrong number, the contents of the
do loop are rerun ; if the user guessed the correct number, the do ... while loop stops execution and the message
You are right! is printed on the console.
In completed loops
Infinite loops are loops that will keep working forever. If you have a
while loop whose declaration does not return false, the loop will continue and may crash your program. Therefore, it is important to ensure that at some point the While Loop stops working
Here is an example of an infinite loop in Java.
This loop will run endlessly. However, we can stop our program using the pause
statement. Let’s say we are creating a program that keeps track of the number of tables available. We only have five paintings in stock. When there are no tables in stock, we want our
while loop to stop. We could create a program that meets these specifications using the following code: