Computer Science Canada I cant seem to use a if statement to check if its even or not to then apply the collatzconjecture on it |
| Author: | deworld [ Fri Nov 06, 2015 5:28 pm ] | ||
| Post subject: | I cant seem to use a if statement to check if its even or not to then apply the collatzconjecture on it | ||
What is it you are trying to achieve? To make a program that uses loops to do the collatzconjecture: divide even numbers by 2 and odd multiply by 3 add 1 User can input whatever natural number they wish Must be bulletproof and user must be able to repeat the program What is the problem you are having? I can't seem to use an if statement to confirm if its a even number or not to then div 2 or multiply 3 add 1 then div 2 It keeps giving me a console that doesn't finish Describe what you have tried to solve this problem i have tried to experiment with loops inside ifs to repeat the div but with no success Post any relevant code (You may choose to attach the file instead of posting the code if it is too long) <Answer Here>
Please specify what version of Turing you are using 4.1.1 |
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| Author: | Zren [ Fri Nov 06, 2015 5:53 pm ] |
| Post subject: | RE:I cant seem to use a if statement to check if its even or not to then apply the collatzconjecture on it |
I think you're mixing up div with mod. div is used to count how many time the right side can go into the left side. Eg: 11 div 2 expands to 5 since 2 goes into 11 five times, with a remainder of 1 (think of long division). mod is used to get the remainder. To check if a number is even, it must be divisible by two and have no remainder. As an aside, try to only use get input in one location so you can keep all your user validation code in a single place. Right now your program isn't bulletproof if I enter asdfasdf after getting the error "This is too low. Please renter a number ABOVE 0". |
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| Author: | Insectoid [ Fri Nov 06, 2015 5:57 pm ] | ||
| Post subject: | RE:I cant seem to use a if statement to check if its even or not to then apply the collatzconjecture on it | ||
This is identical to saying 'if input = 2 then input := 1'. How do you tell if a number is even or odd? I can guarantee that '(input * 3 + 1) div 2' will not tell you if it's even or odd. Maybe have a peek at the mod command. |
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| Author: | deworld [ Fri Nov 06, 2015 6:24 pm ] |
| Post subject: | RE:I cant seem to use a if statement to check if its even or not to then apply the collatzconjecture on it |
I'm not sure whats wrong i've done what i could to clean it up but I cant find out whats making it so it cant output it. On a side note i have made it so the input in the loop only has 1 get input so i bulletproofed it so you cant write letters made 2 get inputs because i'm not sure how to combine both of them into 1 input. |
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| Author: | Insectoid [ Fri Nov 06, 2015 6:41 pm ] |
| Post subject: | RE:I cant seem to use a if statement to check if its even or not to then apply the collatzconjecture on it |
You already have code that checks if the input is a number and converts it or gives an error as required. If you need to get new input from the user, just run that code again. You could make that code a procedure, or you could put it inside another loop that restarts when you detect that the number is unnatural. |
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| Author: | deworld [ Fri Nov 06, 2015 6:51 pm ] |
| Post subject: | RE:I cant seem to use a if statement to check if its even or not to then apply the collatzconjecture on it |
so something like this? loop loop get strin exit when strintok (strin) put "Not a natural number. Please try again: " .. end loop input := strint (strin) if input = 0 then put "This is not a natural number. Rlease renter a number ABOVE 0" elsif input < 0 then put "This is too low. Please renter a number ABOVE 0" end if exit when input >= 1 end loop |
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| Author: | Insectoid [ Fri Nov 06, 2015 7:28 pm ] |
| Post subject: | RE:I cant seem to use a if statement to check if its even or not to then apply the collatzconjecture on it |
Does it work? |
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| Author: | deworld [ Fri Nov 06, 2015 9:35 pm ] |
| Post subject: | RE:I cant seem to use a if statement to check if its even or not to then apply the collatzconjecture on it |
yup i finnaly got it to work let me know if you catch anything i missed/did wrong var input : int var cont : string var strin : string loop put "Enter any natural number" loop loop get strin exit when strintok (strin) put "Not a number. Please try again: " .. end loop input := strint (strin) if input < 1 then put "This is not a natural number(number ABOVE 0). Rlease renter a number: " .. end if exit when input >= 1 end loop loop exit when input = 1 %exit if input mod 2 = 0 then %if even then input := input div 2 %Calculation put input,", " .. else input := input * 3 + 1 %Calculation put input,", " .. end if end loop put "" put "Do you wish to restart the program?(yes or no)" get cont if cont ~= "yes" and cont ~= "no"then put "Invalid input, please enter yes or no in lowercase." get cont end if exit when cont = "no" end loop |
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| Author: | deworld [ Fri Nov 06, 2015 9:38 pm ] |
| Post subject: | RE:I cant seem to use a if statement to check if its even or not to then apply the collatzconjecture on it |
also 2 little questions for the continue at the end is there a way for it to be uppercase and lowercase without having to put another line of code? and for a put statement how can you list them like a graph without putting 10 different put statements? friend recommends a for loop ... is this the optimal/regular way to do it or is it just for my unique situation? |
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| Author: | Zren [ Sat Nov 07, 2015 10:50 am ] |
| Post subject: | RE:I cant seem to use a if statement to check if its even or not to then apply the collatzconjecture on it |
Make sure both strings are either completely lowercase or uppercase before comparing them. |
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