Table of Contents
Which loop is best when the number of iteration is unknown?
Answer: A while loop is ideal for iteration when the number of iterations is not known. Also, it is ideal to use a while loop when you have a condition that needs to be satisfied.
How do you find the number of iterations?
The number of iterations for the inner for loop N 2 = ⌊ final value 2 − initial value 2 increment 2 ⌋ + 1 where. rounds down a real number toward the nearest lower integer. The number of iterations for the nested for loops is N=N1×N2.
How do you decide which loop to use?
When to Use Each Loop
- Use a for loop to iterate over an array.
- 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.
Which loop is preferred to use when the number of times the loop will execute is not known in advance?
Sentinel controlled loop
Sentinel controlled loop is useful when we don’t know in advance how many times the loop will be executed.
How do you count the number of iterations in a while loop in Python?
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- count = 0; \% kind of important to start at 0 for an accurate count.
- loopStart = 1; \% arbitrary.
- loopEnd = 10; \% arbitrary.
- while loopStart < loopEnd.
- count = count + 1; \% this increments by 1 each time the loop executes.
How do you count loops in Python?
Python’s enumerate() lets you write Pythonic for loops when you need a count and the value from an iterable. The big advantage of enumerate() is that it returns a tuple with the counter and value, so you don’t have to increment the counter yourself.
When should we use while loop?
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”.
When we use do while loop?
Using the do-while loop, we can repeat the execution of several parts of the statements. The do-while loop is mainly used in the case where we need to execute the loop at least once. The do-while loop is mostly used in menu-driven programs where the termination condition depends upon the end user.
Where do we use while loop and for loop?
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.
How do you use a while loop in Python?
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. While loop falls under the category of indefinite iteration.
How do you count while loops?
The first line of the while loop creates the variable counter and sets its value to 1. The second line tests if the value of counter is less than 11 and if so it executes the body of the loop. The body of the loop prints the current value of counter and then increments the value of counter .