Python While Loop is used to execute a block of statements repeatedly until a given condition is satisfied. And when the condition becomes false, the line immediately after the loop in the program is executed.
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What is the purpose of while loops?

The while loop is used to repeat a section of code an unknown number of times until a specific condition is met. For example, say we want to know how many times a given number can be divided by 2 before it is less than or equal to 1.

How do you use a while loop in Python?

  1. i = 3.
  2. while True: Loop forever.
  3. print(i)
  4. i = i – 1.
  5. if i == 0: Stop loop when `i` is `0`
  6. break.
How does a for loop start?

The loop initialization where we initialize our counter to a starting value. The initialization statement is executed before the loop begins. If the condition is true, then the code given inside the loop will be executed, otherwise the control will come out of the loop. …

How many times while loop will be executed?

The main difference between the two is the while loop may execute zero times if the condition is initially false, the repeat-until loop always executes at least once.

What does == mean in Python?

The == operator compares the value or equality of two objects, whereas the Python is operator checks whether two variables point to the same object in memory. In the vast majority of cases, this means you should use the equality operators == and !=

What are the 3 types of loops?

Loops are control structures used to repeat a given section of code a certain number of times or until a particular condition is met. Visual Basic has three main types of loops: for.. next loops, do loops and while loops.

How do you write a while loop?

Start the while loop by writing a do while command. The while command usually includes the words “do while,” along with other minimal code.

What are the 3 parts of a for loop?

The For-EndFor Statement Structure Similar to a While loop, a For loop consists of three parts: the keyword For that starts the loop, the condition being tested, and the EndFor keyword that terminates the loop. JAWS performs all statements found in the boundaries of the loop as long as the loop condition is true.

What is loop example?

A loop is used for executing a block of statements repeatedly until a particular condition is satisfied. For example, when you are displaying number from 1 to 100 you may want set the value of a variable to 1 and display it 100 times, increasing its value by 1 on each loop iteration.

How does a for loop work?

After the body of the ‘for’ loop executes, the flow of control jumps back up to the increment statement. … If it is true, the loop executes and the process repeats itself (body of loop, then increment step, and then again condition). After the condition becomes false, the ‘for’ loop terminates.

What is the difference between for loop and while loop?

for loop: for loop provides a concise way of writing the loop structure. Unlike a while loop, a for statement consumes the initialization, condition and increment/decrement in one line thereby providing a shorter, easy to debug structure of looping.

How do you convert a for loop to a while loop?

  1. /* For loop */ int i; for(i = 0; i < 10; i++) { } …
  2. /* While loop */ while(*str++ != NULL) { length++; …
  3. /* Do while loop */ do. { status = check_connection(); …
  4. /* For loop */ int i; for(i = 0; i < 10; i++) {
Where do we use while loop and 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.

What does != Mean in Python?

In Python != is defined as not equal to operator. It returns True if operands on either side are not equal to each other, and returns False if they are equal. … And is not operator returns True if operands on either side are not equal to each other, and returns false if they are equal.

What does != Mean in programming?

The not-equal-to operator ( != ) returns true if the operands don’t have the same value; otherwise, it returns false .