by use of the logical operators Show
Or even use the 'or' operator ( || ) ;P while ( (x>42) || (y<42) || (n==42) ) { /* ... */ }
since a while loop only runs if its condition is true, you can connect multiple conditions with the Boolean and (&&) while(condition1 && condition2 && condition3) { // do something }
Even you can use both. while(((5 > y) || (x < 5)) && (z != 10)) { /* my statements... */ }
You can use logical operators (&&, ||, !) or even the conditional operators (?:)
It's pretty much been answered albeit without much explanation: || if you want either condition being true to keep it running, && if you want either condition being false to end it. I think you need an explanation, too... With OR (||), we say loop if ANY of the following are true. With AND (&&), we're saying EVERY one of these must be true. I would like to add that if one condition or all conditions are false for && and || respectively, all code in your while block will not run. This could also be where you're going wrong (no code posted). If this is the case, a do-loop is better. Syntax: do { /* your code */ } while (condition) || (condition); Hopefully this better clarifies things.
@Jamie, I agree with your solution but I myself made a lot of use in my past programming profession that included the CASE structure in it to execute the DO WHILE loop. To exit the WHILE LOOP, I used a simpel FOR ELSE condition to change the WHILE condition to exit the LOOP. It is nice to see that some of you go the extra step to help a fellow programmer...
And yet another method: You can combine if/case statements within your loop with the 'continue' command to add flow changes within a loop.
Suppose in a while loop, you have two conditions, and any one needs to be true to proceed to the body, then in that case you can use the || operator between those two conditions, and in case you want both to be true, you can use && operator.
By using if statements and logical operators such as &&, 11,!
using logical operators ✌
link then using Boolean operators
use or function while ( (a>10) || (b<10) || (m==10) ) { /* have a fun */ }
You can use logical operators i.e. or,and,not to combine these conditions to get the required outputs.
while(condition) { while(condition) { while(condition) { } } }
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In this article we will learn how to keep programs running as long as users want them to. We will use Python while loop to keep programs running as long as certain conditions remain true. The while loop is used when you need your logic repeated until a certain condition is met, usually because you don't know how many times it will take. This could be because you are waiting for some condition to be met, like a timer expiring or a certain key press. Python while loop syntaxThe The general syntax of while loop would be: while test: # Loop test
handle_true() # Loop body
else: # Optional else
handle_false() # Run if didn't exit loop with break The while statement
consists of a header line with a test expression, a body of one or more normally indented statements, and an optional Example-1: How to repeat python while loop a certain number of timesIn this example we will write a code to repeat python while loop a certain pre-defined number of times. The general syntax to achieve this would be: i = 0 while i < n: # do something here i += 1 It is important that in such condition we increment the count in each loop to avoid repeating the same loop. Here I have an example script where we want the while loop to be run 5 times. So we take a variable " #!/usr/bin/env python3 count = 1 while count <= 5: print(count) count += 1 Output from this script: Example-2: How to exit while loop in Python based on user inputWe can use Here is our example script, where we ask for password two times to the user. If both password match then we exit the python while loop or else the code will continue to ask for password till eternity. #!/usr/bin/env python3 while True: pwd1 = input("Enter new password: ") pwd2 = input("Retype your password: ") if pwd1 == pwd2: print('Perfect!!') break print("Both password don't match, try again..") Output from this script: Example-3: Using python while loop with a flagIn the previous example, we had the program perform certain tasks while a given condition was true. But what about more complicated programs in which many different events could cause the program to stop running? We can write our programs so they run while the flag is set to Let's add a flag to our previous example, we will call this flag as #!/usr/bin/env python3 # Set the flag as True initially active = True while active: pwd1 = input("Enter new password: ") pwd2 = input("Retype your password: ") if pwd1 == pwd2: print('Perfect!!') ## Instead of using break we set the flag active as False active = False ## Now we need an else condition as we are not breaking ## out of the while loop else: print("Both password don't match, try again..") Output
from this script: Example-4: When to use continue in a python while loopRather than breaking out of a loop entirely without executing the rest of its code, you can use the continue statement to return to the beginning of the loop based on the result of a conditional test. For example, consider a loop that counts from 1 to 10 but prints only the odd numbers in that range: #!/usr/bin/env python3 num = # If num is less than 10 while num < 10: # increment num by 1 num += 1 ## Check for divided by 2 gives a remainder ## if remainder is zero, then it is an even number if num % 2 == 0: # If the loop enters here means even num found # so skip this num and continue with the loop continue # if condition was no match so print odd number print(num) First we set Output from this script: Example-5: When to use break in a python while loopI have already used For example here I have an infinite while loop where I ask user for some text input. Then the script will capitalize the first letter of the text unless user decides to quit by providing " #!/usr/bin/env python3 while True: text = input("String to capitalize [type q to quit]: ") if text == "q": break print(text.capitalize()) Here we read a line of input from the keyboard via Python’s Example-6: How to use break with while and else condition in PythonIf the while loop ended normally (no break call), control passes to an optional else. You use this when you’ve coded a while loop to check for something, and breaking as soon as it’s found. The else would be run if the while loop completed but the object was not found. In this example script, we will look out for even numbers from a provided list of numbers. #!/usr/bin/env python3 numbers = [1, 3, 5, 9] position = while position < len(numbers): number = numbers[position] if number % 2 == : print('Found even number', number) break position += 1 # if break is not called then loop enters else condition else: print('No even number found') Here also we are checking for a number divisible by 2 with 0 remainder. If no such number found then the loop enters ~]# python3 example-5.py
No even number found Example-7: How to use nested while loop in PythonPython allows you to nest loops. A nested loop is simply a loop that resides inside of another loop. There are lots of good reasons to use nested loops, from processing matrices to dealing with inputs that require multiple processing runs. The syntax to use a nested while loop would be something like: i = while i < n: j = while j < m: # do something in while loop for j j += 1 # do something in while loop for i i += 1 Suppose you are given the task of implementing a program that accepts a number from a user and then determines whether it is a prime number. The program also has to continue to accept values from the user until the user enters a zero. To determine if a number is prime, you divide it by the values beginning at 2 and ending at the number. If none of those values results in a number without a remainder, the value is prime; if any one of the values does result in a number without a remainder, the number is not prime. #!/usr/bin/env python3 while True: number = int(input("Enter a number: ")) if number == : break divisor = 2 isPrime = True while divisor < number: # break the loop if prime number if number % divisor == : isPrime = False break divisor += 1 if isPrime == True: print("The value ", number, " is prime") else: print("The value ", number, " is NOT prime") print("Done") Output from this script: ~]# python3 example-6.py
Enter a number: 12
The value 12 is NOT prime
Enter a number: 14
The value 14 is NOT prime
Enter a number: 23
The value 23 is prime Example-8: How to use python while loop with multiple conditionsIn al the previous examples, we have defined a single condition with our python while loop. But it is also possible that there are multiple conditions to execute the loop. Here is one such example: #!/usr/bin/env python3 i = 1 j = 10 while i < 5 and j > 1: i += 1 j -= 1 print(i, j) Here we have added a condition to run the loop as long as the value of Here are some more syntax to understand the usage of multiple conditions in python while loop: while (a != b) and (a != c) and (a != d): # do something while (a != b) or (a != c) or (a != d): # do something while a not in { b, c, d }: # do something SummaryIn this article you learned how to use python while loop to make your programs run as long as your users want them to. You saw several ways to control the flow of a while loop by setting an active flag, using the Further ReadingsThe while statement in Python Related Searches: python break while loop, python while loop example, python exit while loop, nested while loops python, how to end a while loop in python, python infinite while loop, python while loop multiple conditions, python while loop user input, python break out of while loop, python while loop syntax Can I have 2 conditions in while loop Python?Grouping multiple conditions in Python
Python multiple conditions in an if statement requires several true conditions at the same time. In this example, we can easily use the multiple logical operators in the while loop condition.
Can you have 2 conditions in a while loop?Using multiple conditions
As seen on line 4 the while loop has two conditions, one using the AND operator and the other using the OR operator. Note: The AND condition must be fulfilled for the loop to run. However, if either of the conditions on the OR side of the operator returns true , the loop will run.
How many conditions can a while loop have in Python?Logical AND Operator
Here, the while loop has two conditional expressions, A and B, that it needs to evaluate.
How do you write multiple statements in for loop in Python?If you want to execute multiple statements for every iteration of the for loop, then indent them accordingly (i.e put them in the same level as the print command).
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