----------------------------------- Shamikh Mon Jun 02, 2008 7:14 pm Randomly Choosing 10 out of 40 ----------------------------------- I need to be able to choose randomly 10 questions out of a possible 40: lol (1) := question1 lol (2) := question2 lol (3) := question3 lol (4) := question4 lol (5) := question5 lol (6) := question6 lol (7) := question7 lol (8) := question8 lol (9) := question9 lol (10) := question10 lol (11) := question11 lol (12) := question12 lol (13) := question13 lol (14) := question14 lol (15) := question15 lol (16) := question16 lol (17) := question17 lol (18) := question18 lol (19) := question19 lol (20) := question20 lol (21) := question21 lol (22) := question22 lol (23) := question23 lol (24) := question24 lol (26) := question26 lol (27) := question27 lol (28) := question28 lol (29) := question29 lol (30) := question30 lol (31) := question31 lol (32) := question32 lol (33) := question33 lol (34) := question34 lol (35) := question35 lol (36) := question36 lol (37) := question37 lol (38) := question38 lol (39) := question39 lol (40) := question40 lol is my array and the question1 etc.. are procedures. The only way i would do it is to somehow assign every question an int value and then randint, but i dont know how. Some help plz. ----------------------------------- Tony Mon Jun 02, 2008 7:20 pm RE:Randomly Choosing 10 out of 40 ----------------------------------- every question already has an int value -- the index of the array. Also, randint is deprecated, use Rand.Int() ----------------------------------- Shamikh Mon Jun 02, 2008 7:22 pm RE:Randomly Choosing 10 out of 40 ----------------------------------- What do u mean the index of the array. Sorry im so bad, im in grade 9 Compsci ----------------------------------- Shamikh Mon Jun 02, 2008 7:29 pm RE:Randomly Choosing 10 out of 40 ----------------------------------- understand the index but how do iput that into my randint equation? p.s Rand.Int isnt working for me ----------------------------------- Tony Mon Jun 02, 2008 7:44 pm Re: RE:Randomly Choosing 10 out of 40 ----------------------------------- p.s Rand.Int isnt working for me You're not doing it right. lol(Rand.Int(1,40)) Of course your next problem would be to make sure that you don't pick the same question twice. The usual approach is to have another array of indexes of elements that were not yet selected, and pick randomly from _that_ array. ----------------------------------- Shamikh Mon Jun 02, 2008 7:47 pm RE:Randomly Choosing 10 out of 40 ----------------------------------- So make another array from 1 to 40 then do the same thing with that? I dont quite understand. ----------------------------------- Shamikh Mon Jun 02, 2008 7:48 pm RE:Randomly Choosing 10 out of 40 ----------------------------------- So like this: olo(lol(Rand.Int(1,40)) ----------------------------------- Tony Mon Jun 02, 2008 7:57 pm RE:Randomly Choosing 10 out of 40 ----------------------------------- no, like [url=http://compsci.ca/v3/viewtopic.php?t=2184]over here ----------------------------------- Shamikh Mon Jun 02, 2008 8:19 pm Re: Randomly Choosing 10 out of 40 ----------------------------------- So i would make the following changes to this code to fit my program: var size:int :=10 var randN:int %just to hold the number var numbers:array 1..size of int for i:1..size numbers(i):=i end for for decreasing i:size ..1 randN := Rand.Int(1,i) put numbers(randN) numbers(randN):=numbers(i) end for Where would my lol go? ----------------------------------- Tony Mon Jun 02, 2008 8:21 pm RE:Randomly Choosing 10 out of 40 ----------------------------------- Once you figure out how that code snippet works, it should be rather obvious. ----------------------------------- Shamikh Mon Jun 02, 2008 8:23 pm RE:Randomly Choosing 10 out of 40 ----------------------------------- Still working on it, Remembr im Grade 9 ----------------------------------- Shamikh Mon Jun 02, 2008 8:26 pm RE:Randomly Choosing 10 out of 40 ----------------------------------- It keeps saying lol has been previoulsy decalred ----------------------------------- Shamikh Mon Jun 02, 2008 8:29 pm RE:Randomly Choosing 10 out of 40 ----------------------------------- Someone Give me a hint. Its Soooo Frustrating! ----------------------------------- richcash Mon Jun 02, 2008 8:41 pm Re: Randomly Choosing 10 out of 40 ----------------------------------- A hint? Well, lol is an array and I only see one array in that code snippet. ----------------------------------- Tony Mon Jun 02, 2008 8:48 pm RE:Randomly Choosing 10 out of 40 ----------------------------------- forget about lol for a moment. Start by explaining how that code gets to generate a random list. protip: there's an explanation in the thread where you copied that code from. Then figure out how to take numbers from that random list, one at a time. Then we are back to lol(index) ----------------------------------- Shamikh Mon Jun 02, 2008 8:57 pm RE:Randomly Choosing 10 out of 40 ----------------------------------- THATS what im trying to do. Take one number from that list at a time and use that particular question ----------------------------------- Shamikh Mon Jun 02, 2008 9:01 pm RE:Randomly Choosing 10 out of 40 ----------------------------------- so "size" is the number of numbers it creates, "number" is the name of the array and it says from 1 to whatever your size is. and "numbers(i):=i' tells it how many pockets in the array. am i right? ----------------------------------- Shamikh Mon Jun 02, 2008 9:06 pm RE:Randomly Choosing 10 out of 40 ----------------------------------- "randN" is the random number and "number" is the number of outputted integers. numbers(randN):=numbers(i) makes sure no numbers are exactly the same. but i still dont understand how to pull one number from that random generation, ----------------------------------- Tony Mon Jun 02, 2008 9:07 pm Re: RE:Randomly Choosing 10 out of 40 ----------------------------------- "numbers(i):=i' tells it how many pockets in the array. am i right? No. If you need to review how arrays work, you can find the tutorials through the Turing Walkthrough ----------------------------------- Tony Mon Jun 02, 2008 9:09 pm Re: RE:Randomly Choosing 10 out of 40 ----------------------------------- numbers(randN):=numbers(i) makes sure no numbers are exactly the same. That is also wrong. ----------------------------------- Shamikh Mon Jun 02, 2008 9:12 pm RE:Randomly Choosing 10 out of 40 ----------------------------------- could you be so kind as to give a tiny hint i kno i have to have: lol (part of that code) just looked at the arrays tutorial. ----------------------------------- Tony Mon Jun 02, 2008 9:19 pm RE:Randomly Choosing 10 out of 40 ----------------------------------- how does that code know which number to print to screen? Also -- I am fully expecting you to cite the source of this piece of code, if you'll end up using that in your assignment. ----------------------------------- Shamikh Mon Jun 02, 2008 9:25 pm RE:Randomly Choosing 10 out of 40 ----------------------------------- from this piece of code for decreasing i:size ..1 randN := Rand.Int(1,i) put numbers(randN) P.s--Also this is not for an assignment, rather for something else i am working on. ----------------------------------- Tony Mon Jun 02, 2008 9:28 pm RE:Randomly Choosing 10 out of 40 ----------------------------------- well then in the similar matter you can get that random number, and instead of puting it to screen - call your procedure ----------------------------------- Shamikh Mon Jun 02, 2008 9:37 pm RE:Randomly Choosing 10 out of 40 ----------------------------------- What do u mean. call my procedure. So instead of Put i do lol(Rand.Int(1,40))? ----------------------------------- Tony Mon Jun 02, 2008 9:47 pm RE:Randomly Choosing 10 out of 40 ----------------------------------- that would be a good place to start.. yes. ----------------------------------- Shamikh Mon Jun 02, 2008 10:13 pm RE:Randomly Choosing 10 out of 40 ----------------------------------- Thanks very much, for being patient with me. I could telli was getting on your nerves. I dont blame ya, If i was you so would i. Thanks again man.