Do While vs While Java?

What is the difference between a while () and a do while () loop?

16 Answers. The do while loop executes the content of the loop once before checking the condition of the while. Whereas a while loop will check the condition first before executing the content.

Do While VS for while?

while loop vs. while loop in C/C++


While Loop Do-While Loop
The while loop may run zero or more times Do-While may run more than one times but at least once.
The variable of test condition must be initialized prior to entering into the loop The variable for loop condition may also be initialized in the loop also.

What is while loop example?

A “While” Loop is used to repeat a specific block of code an unknown number of times, until a condition is met. For example, if we want to ask a user for a number between 1 and 10, we don’t know how many times the user may enter a larger number, so we keep asking “while the number is not between 1 and 10”.

Does while loop execute at least once?

while statement creates a loop that executes a specified statement until the test condition evaluates to false. The condition is evaluated after executing the statement, resulting in the specified statement executing at least once.

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When should I prefer do while over while?

While loop checks the input condition first and exits if the condition fails. This nature of do-while loop is essential for making a menu driven program where we need to show a list of options to the user and wait for the user s input. …

Is for loop faster than while?

The main reason that While is much slower is because the while loop checks the condition after each iteration, so if you are going to write this code, just use a for loop instead.

Which is best for or while?

Use a for loop when you know the loop should execute n times. Use a while loop for reading a file into a variable. Use a while loop when asking for user input. Use a while loop when the increment value is nonstandard.

What is a do-while loop example in real life?

Do-while loops are sometimes useful if you want the code to output some sort of menu to a screen so that the menu is guaranteed to show once. Example: int data; do { cout << “Enter 0 to quit: “; cin >> data; cout << endl << endl; } while (data != 0);

How does a while loop start?

First, we set a variable before the loop starts (var i = 0;) Then, we define the condition for the loop to run. As long as the variable is less than the length of the array (which is 4), the loop will continue. Each time the loop executes, the variable is incremented by one (i++)

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