Computer Science Canada Array Addition |
| Author: | Fashoomp [ Tue Feb 26, 2008 6:08 pm ] |
| Post subject: | Array Addition |
I have an array thats 1..30, and all 30 contain numbers I want another array to store the results of addition within the array. I want addition_array (i) := num_array (i) + num_array (i+1) Problem is for the final value, (i+1) is out of range. |
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| Author: | syntax_error [ Tue Feb 26, 2008 6:11 pm ] |
| Post subject: | RE:Array Addition |
trace though your program :L you will see that the reason why you get out of range is you are looking for the 31st index; doesnt exist. I do that that is your problem. |
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| Author: | Tony [ Tue Feb 26, 2008 6:11 pm ] |
| Post subject: | RE:Array Addition |
well if your range is up to 30 and you want i + 1 to be the final value, what should i go up to? that is: i + 1 = 30 i = ? |
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| Author: | OneOffDriveByPoster [ Tue Feb 26, 2008 6:12 pm ] |
| Post subject: | Re: Array Addition |
So... your addition_array has one less entry, or you assume that the missing value is 0, or that the source array is circular, etc. |
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| Author: | Fashoomp [ Tue Feb 26, 2008 6:15 pm ] |
| Post subject: | Re: Array Addition |
That doesn't help, since my code is (i+1) - (i) I need to subtract value 2 from 1, then 3 from 2, then 4 from 3, etc. The array of 30 was just an example. My array size is actually the length of a word I have entered. |
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| Author: | Tony [ Tue Feb 26, 2008 6:17 pm ] |
| Post subject: | RE:Array Addition |
it doesn't make a difference. Just make sure that max_i + 1 == length_of_word |
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| Author: | Fashoomp [ Tue Feb 26, 2008 6:18 pm ] |
| Post subject: | Re: Array Addition |
Yes, the missing value in the addition array is a 0. |
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| Author: | syntax_error [ Tue Feb 26, 2008 6:19 pm ] |
| Post subject: | Re: Array Addition |
Fashoomp wrote: Yes, the missing value in the addition array is a 0. care to clarify? |
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| Author: | Fashoomp [ Tue Feb 26, 2008 6:20 pm ] |
| Post subject: | Re: RE:Array Addition |
Tony @ Tue Feb 26, 2008 6:17 pm wrote: it doesn't make a difference. Just make sure that
max_i + 1 == length_of_word But thats impossible. The fact that its i+1 means that it will always exceed the value of the for loop (sorry if I never mentioned thats what I'm using) |
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| Author: | Tony [ Tue Feb 26, 2008 6:23 pm ] |
| Post subject: | RE:Array Addition |
hmm... really? let word = "think" then length_of_word := length(word) length_of_word == 5 let max_i = length_of_word - 1 max_i == 4 max_i + 1 == length_of_word 4 + 1 == 5 QED |
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| Author: | Fashoomp [ Tue Feb 26, 2008 6:23 pm ] |
| Post subject: | Re: Array Addition |
Sorry for double post Would a conditional loop be better for adding my values to the array? Since I can just tell the loop to exit at word_length - 1, so my variable + 1 is my last array value? That sounds right so I'm gonna go with that. |
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| Author: | syntax_error [ Tue Feb 26, 2008 6:24 pm ] |
| Post subject: | RE:Array Addition |
glad you can think it out. Try that again next time. |
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| Author: | Nick [ Tue Feb 26, 2008 6:43 pm ] | ||||
| Post subject: | RE:Array Addition | ||||
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