Best answer: What is the main difference between while loop and do while loop in Java?

What is the main difference between a while and do-while loop in Java?

Here is the difference table:

while do-while
Variable in condition is initialized before the execution of loop. variable may be initialized before or within the loop.
while loop is entry controlled loop. do-while loop is exit controlled loop.
while(condition) { statement(s); } do { statement(s); } while(condition);

What is the main difference between a while loop and a do-while loop?

1. While the loop is an entry control loop because firstly, the condition is checked, then the loop’s body is executed. The do-while loop is an exit control loop because in this, first of all, the body of the loop is executed then the condition is checked true or false. 2.

What is difference between for loop while loop and do-while loop in Java?

Java for Loop vs while Loop vs do-while Loop

The Java for loop is a control flow statement that iterates a part of the programs multiple times. … The Java do while loop is a control flow statement that executes a part of the programs at least once and the further execution depends upon the given boolean condition.

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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”.

What is while loop statement?

A while loop is a control flow statement that allows code to be executed repeatedly based on a given Boolean condition. The while loop can be thought of as a repeating if statement.

What is the similarity between while and do-while loop?

The similarites are that each has a body of code that is executed perhaps multiple times. This is usually called the “loop body”. They also have a “while” portion that tests a condition that determines whether the loop should be executed another time.

WHY IS for loop better than while loop?

If the condition is absent in for loop, the loop iterates for an infinite number of times whereas the while loop shows an error in case of the absence of the condition. For loop can be used only in case of a known number of iterations whereas while loop is used only when the number of iterations is not known.

Why use a while loop instead of a for loop?

In general, you should use a for loop when you know how many times the loop should run. If you want the loop to break based on a condition other than the number of times it runs, you should use a while loop.

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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.

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++)

Where do we use for loop?

A “For” Loop is used to repeat a specific block of code a known number of times. For example, if we want to check the grade of every student in the class, we loop from 1 to that number. When the number of times is not known before hand, we use a “While” loop.