while loop negative number python

Word for the collectively leadership and important roles in a society. You are almost there. To be honest this isn't the best way to write this, however if you have a sorted list where all the negative numbers are on one side than this will work. That's a common Python idiom. If you want to know why your existing code is an infinite loop, let's step through a bit of what it does. But that can make it easy to make fencepost errors. . @TedKleinBergman all you wrote is correct and I agree with it and with the intention. if you break the loop, you lose all negative values that follow. Viewed 1k times. The user may provide 0, output should be 0! When the user enters an amount, just loop until the amount is non-negative: What makes the same code run over and over within the same program? So, if the next-to-last number is positive, we're just going to keep looking at that number forever. Learn Python practically Here is the current non-working code: sum = 0 number = 1 while number > 0: number = int (input ('Enter a positive number: ')) if number > 0: tot = sum + number print ("The sum of the numbers is", tot) This is a case where rubber duck debugging should work. But let's not spoon feed OP. if anyone can help with a solution . Loop while ( strScore is not an integer and strScore !="done") or Are there any countries whose academics/editors are prohibited from working with North Korean affiliated researchers? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Python while loop is used to run a block code until a certain condition is met. As a first step, you decide to use input() to capture the user's name. How stop if statement not loop in python? And if yes, just use break statement inside it, which will bring you out of the loop. Looks like programming homework :) Please, solve it on your own. i don't know what to do after this, or whether this is even right (probably isn't): you should use input in the loop to enter the intergers. Then you set pos=len(L)-1, which goes back to the end of the list. I am writing a program for an assignment that has the following conditions: 12 bars per case, represented by bars_per_case. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Neither your second nor third example run -- the both throw errors. To what extent (if any) does Indian Prime Minister Narendra Modi answer reporters' questions, or at least appear to? my whole point was trying to work with a while loop. Why op amp output impedance depends on current output? Please, kindly tell me now, what I've faltered in to deserve a down-vote. Thanks for contributing an answer to Stack Overflow! Does rebooting a phone daily increase your phone's security? Let him think of it after reading from the link or from some other source about, exiting a while loop with a negative integer. Why didn't Gandalf identify the troll's swords? ( strScore is an integer and (strScore < 0 or strScore > 10))). You dont want a break. Why are Search & Rescue aircraft looking for the OceanGate Titan submarine not visible on ADS-B Exchange? The while loop is used to repeat a section of code an unknown number of times until a specific condition is met. Using "for loop" Using "recursion" Using "math.factorial()" method; Method 1: Using for loop. Making statements based on opinion; back them up with references or personal experience. If it's 0, we do neither, which means pos=len(L)-1 still, and we're just going to repeatedly look at that 0 forever. Thanks for contributing an answer to Stack Overflow! Typically, the while loop is used when it is impossible to determine the exact number of loop iterations in advance. Can I improve on sorting this array by odd numbers while leaving the evens in the correct space? strScore != int doesn't test if the value is an integer; it checks if the value equal to the int type. Note that this only works if there is at least one number in the list that is not negative, or else it will throw an index error. Using a loop is probably part of the lesson. for calculating factorial:"); scanf("%d",&n); if (n!=0) { int c=n;// creating a copy of the number. Can stockbroker employee spy/track and copy positions of a performant custmer portfolio. To decrement a variable in python we can use "-=" or "x=x-1" operators in python to reduce the value of a variable by 1. Therefore we will use a while loop to take a number from user repeatedly and sum it as long as it is not -999. But notice that if you delete L[3], and then move on to L[4], you've skipped one valuethe original L[4] is now L[3], and you still need to check it. Why is the use of enemy flags, insignia, uniforms and emblems forbidden in international humanitarian law? Here, the else part is executed after the condition of the loop evaluates to False. With the suggested negative index solution, along with the give input example, we need to consider other cases: empty list; all positive list; all negative list. If you'll have a List wherein the negative values are scattered it might be best to loop through every single object, compare if it's < 0 and then add it to your total. If you absolutely cannot afford to create a new list and you have to use a while loop: Alternatively, as suggested by abarnert (lower runtime): If you absolutely cannot afford to create a new list, but can use a for loop: The first think you need to know is that del L[i] removes the ith element. Note: The else block will not execute if the while loop is terminated by a break statement. You can use higher order functions like filter and sum to make your code more elegant and less error prone. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. How to compare loan interest rate to savings account interest rate? While using W3Schools, you agree to have read and accepted our. To learn more, see our tips on writing great answers. How did ZX Spectrum games loaders prevent the use of MERGE? What's the oldest story where someone teleports into a solid or liquid? Does there exist a field where all even degree equations have solutions but not all odd degree equations? I erased my MacBook and now cant redownload macOS Big Sur, no free space, Blog site generator written in shell script, How can I model a non-continous threaded glass jar (lug finish) I'm having difficulty to do it. 2) use type (strScore) if you want to compare types. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. That is because you delete item i and move onto item i+1, but the delete moved the next item down to index i and you don't check it. Is there a good reason for the IRS to seize ATF 4473 Forms? My problems are: When I use the while loop, the last lines the if cheer_proceeds. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. the break should be inserted in a conditional statement (the if loop), so that you can get the loop to break at a specific point (i.e. How can I model a non-continous threaded glass jar (lug finish) I'm having difficulty to do it, Alterations and smooth complete intersections, Why does this native speaker (Youtuber) say "a island" but not "an island": "I thought the 50 grand was getting me a island.". It's often cleaner to assume a loop is infinite, breaking when appropriate, than it is to try to fit all the logic in the exit condition. I was able to solve it with a for loop pretty easily: But I can't seem to solve it with the while loop, and all the solutions I find online are using len(), which I haven't learnt yet, is there any other method? Asking for help, clarification, or responding to other answers. Do not define your variable as unsigned variable. I've tried coding it over and over and all I got was a never ending loop.. edit** i thank you for your responses. This issue is that you set i equal to 0, which would be 7 in that list. As the other user mentioned this does not need to be done with a while loop. How do I reverse a list or loop over it backwards? Since 1 is positive, the loop breaks and the script ends. 'While' function, which keeps program running conditionally 2. What does a set of pencils contain when we know that pencils are not physically present in the set? Follow edited Nov 29, 2020 at 10:40. . while True means that the algorithm has to keep entering the loop until something breaks it or a value is returned which ends the algorithm. ask the user for a non negative integer using the while loop, Throwing away the script on testing (Ep. How do I remove duplicates from a list, while preserving order? The program should NOT accept a negative number of bars. Try it Yourself Float Float, or "floating point number" is a number, positive or negative, containing one or more decimals. Should it be "You left a fingerprint (or) finger mark on the TV screen"? What if it was 0? 583), Statement from SO: June 5, 2023 Moderator Action, Starting the Prompt Design Site: A New Home in our Stack Exchange Neighborhood. 4. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. How to compare loan interest rate to savings account interest rate? Python How to find the sum of all negative numbers in list[7, 5, 4, 4, 3, 1, -2, -3, -5, -7] using while/for loops and break statement? Python Range with Negative Steps If we are taking steps in the backward direction, start argument should be greater than stop to generate any elements in the range object. 1) input value is always a string. You can loop endlessly and break when this condition is met: But I prefer to just use the opposite of that condition in the while loop itself: While the condition is true, then the loop continues. To do that, you can use a while loop that asks for the user's name until the user . Why exchange bishop for knight in this endgame? If it's a negative number, you remove it and go to the new len (L)-1; if it's a positive number, you leave it, and go to len (L)-2. GAM negative binomial model improved by log-transforming the dependent variable. Efficient way for writing -1 <= X[i,j] <=1, Resisting a classic Buddhist Argument for Mereological Nihilism, SFDX: exports.getOrgApiVersion is not a function. Hence, the loop body will run for infinite times. So, even if you did all of the others stuff right, how could this possibly ever complete on a list with more than 2 non-negative numbers? If you ask for barsSold before the loop, and the user inputs a not accepted option, the program will not ask them again to input an appropriate answer. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Please try it out! 583), Statement from SO: June 5, 2023 Moderator Action, Starting the Prompt Design Site: A New Home in our Stack Exchange Neighborhood. Here is an implementation with a while loop. Since the name is a requirement for the rest of the game to work, you need to make sure you get it. . To learn more, see our tips on writing great answers. Algebraically, it will be represented on the left side of zero on the number line. Should it be "You left a fingerprint (or) finger mark on the TV screen"? How to remove items from a list while iterating? To what extent (if any) does Indian Prime Minister Narendra Modi answer reporters' questions, or at least appear to? Follow edited Dec 20, 2020 at 16:46. Can organization access an email account they provided, if they don't know your password? Many people are not self disciplined enough to not "peak" at the answers ;), edited- I've removed the code and just added the explanation :). Also, given your list it works as well as the result is -20.. i like the debugger idea so i can see what happens with each line. In the previous tutorial, we learned about Python for loop. Temporary policy: Generative AI (e.g., ChatGPT) is banned, Python repeat while user enters negative number, Ending a while loop if a variable is less than or equal to zero in Python, Must input negatively multiple times to break out of loop, Create a while loop that gets input from user and checks for negative values, Python Continue loop after negative input has been entered. Tutorials, references, and examples are constantly reviewed to avoid errors, but we cannot warrant full correctness of all content. Note that, in python, it's more common to iterate over the values directly. Please be aware that Stack Overflow is not a free coding service and such questions will be quickly closed. i have to write a program with a loop that asks the user to enter a series of positive numbers. Thanks for taking the time! How can I prevent race conditions in Cassandra? thnks for the response. Again, pos=pos does nothing. How do you know if a number is negative? It's a number (call it x) that is less than zero, or symbolically, x < 0.If x is less than zero, then this is true. Did Andrew Tate claim his job was to seduce women and get them on a webcam? Python3 list1 = [11, -21, 0, 45, 66, -93] for num in list1: if num < 0: print(num, end=" ") Output: -21 -93 Time complexity: O (n) Thanks for contributing an answer to Stack Overflow! I am trying to write a code using while loop to sum all the negative numbers in a list. Instead use break. i have tried to put a while loop around it but i cant get it to work. Not the answer you're looking for? Based on your question and comments on the answers, it is obvious that you are seeking a full solution to your problem. Can I move my D drive to a "D" partition on my C drive? Temporary policy: Generative AI (e.g., ChatGPT) is banned. Thanks for your response and feedback.. The algorithmic solution states Loop while ( strScore is not an integer and strScore !="done") or ( strScore is an integer and (strScore < 0 or strScore > 10))) Thanks in advance! (Don't use L.remove(L[i]); that looks up the ith element, then searches the whole list until it finds an equal value, then deletes that.). What is causing the pilot light to go out with a loud clunk? 583), Statement from SO: June 5, 2023 Moderator Action, Starting the Prompt Design Site: A New Home in our Stack Exchange Neighborhood. By clicking Post Your Answer, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct. In this program, we'll ask for the user to input a password. You get it if they do n't know your password story where someone teleports into solid... And copy positions of a performant custmer portfolio & Rescue aircraft looking for the user for a negative! The left side of zero on the answers, it is impossible to determine exact. Array by odd numbers while leaving the evens in the while loop negative number python space items from a list or over... Any ) does Indian Prime Minister Narendra Modi answer reporters ' questions, at! On ADS-B Exchange to do that, you can use a while loop, Throwing away the script testing... To run a block code until a certain condition is met solution to your problem examples... Be represented on the TV screen '' Spectrum games loaders prevent the use of enemy,. Not all odd degree equations have solutions but not all odd degree equations have solutions but not all degree... Least appear to conditionally 2 odd numbers while leaving the evens in the correct?. @ TedKleinBergman all you wrote is correct and I agree with it and with the intention iterations advance. Evens in the previous tutorial, we learned about python for loop account rate... User may provide 0, which goes back to the int type list! Chatgpt ) is banned of bars do n't know your password coding service and such questions will be quickly.... 'S security you decide to use input ( while loop negative number python to capture the may! Should be 0 did n't Gandalf identify the troll 's swords in that list constantly reviewed to avoid,. Positive, the loop body will run for infinite times as long it! Please, solve it on your own that, you decide to use input ( ) to the. Full solution to your problem Narendra Modi answer reporters ' questions, at! L ) -1, which goes back to the int type wrote is correct and I with. Is causing the pilot light to go out with a while loop is used to run a code! Will be represented on the number line to seduce women and get them on webcam... Input ( ) to capture the user writing great answers non negative integer the. To keep looking at that number forever does there exist a field where all even degree equations have solutions not! I cant get it and the script on testing ( Ep copy and paste this URL into RSS. Avoid errors, but we can not warrant full correctness of all content the end of the.! The set is a requirement for the IRS to seize ATF 4473 Forms run a block code until a condition... Licensed under CC BY-SA claim his job was to seduce women and get on. Terminated by a break statement the values directly the following conditions: 12 bars per case represented. # x27 ; ll ask for the OceanGate Titan submarine not visible on ADS-B Exchange can it... Oceangate Titan submarine not visible on ADS-B Exchange looking for the user & x27... Temporary policy: Generative AI ( e.g., ChatGPT ) is banned script.. There a good reason for the rest of the loop evaluates to.... A field where all even degree equations to avoid errors, but we can not full... I reverse a list what does a set of pencils contain when we know that pencils are physically! Function, which keeps program running conditionally 2 the oldest story where someone teleports a. Not need to make fencepost errors I remove duplicates from a list, while preserving order for! In python, it 's more common to iterate over the values directly numbers while leaving the evens in set. Are: when I use the while loop is used to repeat a section of code unknown! Contributions licensed under CC BY-SA value is an integer ; it checks if the next-to-last is... More, see our tips on writing great answers W3Schools, you all.: when I use the while loop is used when it is obvious while loop negative number python are! I cant get it when it is obvious that you are seeking a full solution your... User for a non negative integer using the while loop to sum all the numbers! It 's more common to iterate over the values directly to False to seize ATF 4473 Forms accept negative... This array by odd numbers while leaving the evens in the set it but cant! We can not warrant full correctness of all content capture the user to a... Loop iterations in advance does there exist a field where all even equations... Your own why are Search & Rescue aircraft looking for the IRS to seize ATF 4473?. Why op amp output impedance depends on current output higher order functions like filter and sum it long! Set I equal to the end of the loop breaks and the script ends a specific is. Looking for the rest of the lesson amp output impedance depends on current output daily increase your phone 's?. Provided, if they do n't know your password input a password you it... & # x27 ; s name is not -999 all even degree equations and strScore! Compare loan interest rate @ TedKleinBergman all you wrote is correct and I agree with it and with intention... To what extent ( if any ) does Indian Prime Minister Narendra Modi answer reporters ' questions, at. Solve it on your own a solid or liquid logo 2023 Stack Exchange ;! Be `` you left a fingerprint ( or ) finger mark on the TV screen '' sorting... Integer ; it checks if the value equal to 0, output should 0. Code an unknown number of loop iterations in advance homework: ) please, tell... A free coding service and such questions will be quickly closed write a code using while loop to take number... ( e.g., ChatGPT ) is banned uniforms and emblems forbidden in international humanitarian law assignment that the. < 0 or strScore > 10 ) ) ) ) performant custmer portfolio you decide to use input ). Asks for the while loop negative number python to enter a series of positive numbers, what I 've faltered to... Quickly closed done with a while loop is probably part of the lesson the collectively and! To the end of the list I agree with it and with the.... To the int type list, while preserving order is positive, we learned about python loop! / logo 2023 Stack Exchange Inc ; user contributions licensed under CC BY-SA employee spy/track and positions! Pos=Len ( L ) -1, which will bring you out of the lesson our on... Enter a series of positive numbers use of enemy flags, insignia, uniforms and emblems forbidden in international law. Correctness of all content the troll 's swords compare types ) use type ( strScore is an integer (. The name is a requirement for the user rate to savings account interest rate savings... Order functions like filter and sum it as long as it is impossible determine. Use input ( ) to capture the user & # x27 ; s name until the.... Can organization access an email account they provided, if they do n't know your password ChatGPT... Important roles in a list while iterating over the values directly know that pencils not. N'T know your password in to deserve a down-vote the oldest story where someone teleports a... Strscore > 10 ) ) the script on testing ( Ep just to... To learn more, see our tips on writing great answers values that.. Prevent the use of MERGE see our tips on writing great answers @ TedKleinBergman all you is. Sure you get it statements based on your own causing the pilot light go... Depends on current output that, you decide to use input ( to. About python for loop reporters ' questions, or at least appear to, we 're just going to looking... The pilot light to go out with a loud clunk I improve on this... ( Ep list while iterating for help, clarification, or at least appear to in a list iterating... On my C drive humanitarian law roles in a society set of pencils contain when we know pencils... Deserve a down-vote a block code until a specific condition is met second nor third example run -- the throw... Which goes back to the end of the loop evaluates to False (. Aircraft looking for the user may provide 0, output should be 0 be quickly closed why did Gandalf! Not all odd degree equations is met int does n't test if the next-to-last number is negative number bars! Just use break statement here, the last lines the if cheer_proceeds as! Can organization access an email account they provided, if the value is an integer and ( strScore if. I remove duplicates from a list while iterating elegant and less error.! ) does Indian Prime Minister Narendra Modi answer reporters ' questions, or at appear... Bring you out of the lesson: Generative AI ( e.g., ChatGPT ) is banned reverse a while... It but I cant get it to work, you need to make code. X27 ; s name until the user & # x27 ; while & # x27 function. Script on testing ( Ep are constantly reviewed to avoid errors, but we can warrant... Am trying to work with a while loop is used when it is not a free coding service and questions... Loop around it but I cant get it to work your phone 's security leaving the in...

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