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2D arrays to functions

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2D arrays to functions

mattman059	28 Feb, 2007 - 12:23 PM Post #1
D.I.C Regular Joined: 23 Oct, 2006 Posts: 359 Dream Kudos: 175 My Contributions	CODE int isValid(array[][], int a , int b) That is my function prototype that i will be using in my program... CODE int myArray[5][5]; That is my array. I would like to be able to send my array to the function and pass the parameters a, and b to eventually find out if an element around this block is valid. (making sure that you cant get to myArray[-1][-1] and so forth) any ideas?
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dr_worm	RE: 2D Arrays To Functions 28 Feb, 2007 - 12:27 PM Post #2
D.I.C Head Joined: 11 Sep, 2006 Posts: 131 My Contributions	What do you mean by "if an element around this block is valid"?
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mattman059	RE: 2D Arrays To Functions 28 Feb, 2007 - 12:36 PM Post #3
D.I.C Regular Joined: 23 Oct, 2006 Posts: 359 Dream Kudos: 175 My Contributions	You have this 2D array full of 0's and 1's 01001 00100 10001 00010 01001 In no particular order Okay? well I must find out whether a certain spot is happy or not based on its surroundings. so the element array[0][0] is the very first element (0) and to check to see if its happy or not you would use things like maxRow or maxCol and 0's to say array[0][0] or array[MaxRow-1][0] or something like that. Well its very easy to go outside of the array, and manipulate elements on other rows of the array so Im doing a kind of bounds checking, using a bool to determine whether a certain element is valid or not. if I was to pass the value array[0][0] i would only want to get back results for: array[0][1], array[1][0], and array[1][1]
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bestbat	RE: 2D Arrays To Functions 28 Feb, 2007 - 12:37 PM Post #4
New D.I.C Head Joined: 14 Feb, 2007 Posts: 32 My Contributions	You need to pass it in like this: CODE int isValid(array, int a , int b) I'm not too sure whether this holds for your array, I know this works for arrays using malloc. This post has been edited by bestbat**: 28 Feb, 2007 - 12:38 PM
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mattman059	RE: 2D Arrays To Functions 28 Feb, 2007 - 12:40 PM Post #5
D.I.C Regular Joined: 23 Oct, 2006 Posts: 359 Dream Kudos: 175 My Contributions	Happy.cpp(16) : error C2664: 'numNeighbors' : cannot convert parameter 1 from 'int [5][5]' to 'int ** ' the array is already predefined in terms of size...its definition is myArray[5][5]. so when i actually write the function do i need to dynamically allocate the memory for the array?
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dr_worm	RE: 2D Arrays To Functions 28 Feb, 2007 - 12:47 PM Post #6
D.I.C Head Joined: 11 Sep, 2006 Posts: 131 My Contributions	Could you please post the code in it's entirety? That way we can get a better look at where the errors are coming from and what you're trying to do. And please bear with me, but I still don't know what you mean by a happy element. Is it happy if it's only surrounded by like elements on all sides?
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mattman059	RE: 2D Arrays To Functions 28 Feb, 2007 - 12:50 PM Post #7
D.I.C Regular Joined: 23 Oct, 2006 Posts: 359 Dream Kudos: 175 My Contributions	CODE #include <iostream> using namespace std; int numNeighbors(int,int,int); void Three_Neighbors(int ,int,int); void Five_Neighbors(int,int,int); void Eight_Neighbors(int,int,int); int main() { int myArray[5][5]; cout << numNeighbors(myArray,0,0)<<endl; return 0; } int numNeighbors(int **array,int a, int b) { bool isValid; int neighbors = 0; if(array[a-1][b-1]) { isValid = true; neighbors++; } return neighbors; } in my code, all values are 0, I just want to count the number of neighbors and tell if an element is valid
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Amadeus	RE: 2D Arrays To Functions 28 Feb, 2007 - 01:00 PM Post #8
g++ -o drink whiskey.cpp Joined: 12 Jul, 2002 Posts: 12,349 Thanked: 51 times Dream Kudos: 25 My Contributions	Try CODE int numNeighbors(int [][5],int,int); and check this out. http://www.cplusplus.com/doc/tutorial/arrays.html Multi dimensional arrays need to have the depth passed.
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