Do - while loop

Question

didnt really get how i the do-while loop helpful. whats better in it than the just while loop?

Answer 1

A 'do while' loop will execute at least once because the condition is only checked at the end.

do { wearSunglasses();
}

while (sun is out);

In this scenario you will put your sun glasses first then check if the sun is out. After the loop executes the first time the program should know if the sun is out or not and only put on the sunglasses if it is.

A 'while' loop checks the condition first and will only execute the code between the curly braces if true.

while (sun is out) {
wearSunglasses();
}

In this case if the sun is not out you will not wear your sunglasses.

Hope that helps.

Answer 2

Do-while allows the code to be executed first, before the condition check on while.

Answer 3

When ever you want a piece of code to execute at least once regardless of the state of the condition.

Imagine you work in a coffee shop and the owner wants you to sweep the floor every morning even if it's clean.

do {sweepFloor();
}

while (floor is dirty);

Answer 4

ok. thanks.can i get an example on when is it useful?(the do while)

Answer 5

If you want your code to execute atleast once before checking the condition in the while() , you can use
do
{
// code that runs at least once before checking the condition
}while();