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Thread: Pascal Triangle help
 05012008, 04:39 PM #1Member
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Pascal Triangle help
hey everyone i am new to Java that's why i need any help i can get.
i need to fill up the function Rows returns ragged array containing the first n rows of Pascal's triangle.
i tried playing around with it but considering i am totally new to this i have no idea if i am doing it right or how it should be implemented. I think i am doing way too much of what needs to be done.
can someone please take a look and based on what's given in the main function right now tell me what Rows should look like...
Java Code:public class Pascal { public static int[][] Rows(int n){ int[][] pt = new int[n][]; for (int i = 0; i < n; i++) { pt[i] = new int[i + 1]; // Construct row i. pt[i][0] = 1; // Leftmost value of row i. for (int j = 1; j < i; j++) { pt[i][j] = pt[i  1][j  1] + pt[i  1][j]; // Sum 2 entries above. } pt[i][i] = 1; // Rightmost value of row i. } return pt; } public static void main(String[] args) { if (args.length != 1) { System.out.println("usage: java " + Pascal.class.getName() + " rows"); System.exit(1); } int n = Integer.parseInt(args[0]); if (n > 0) { int[][] pascal = Rows(n); for (int[] row : pascal) { for (int v : row) System.out.print(v + " "); System.out.println(""); } } } }
when i try running this of course nothing gets printed except the usage:java message.
thanks a lot :)
 05012008, 06:21 PM #2
I would use recursion to generate the Fibonacci numbers then just print them out.
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 05012008, 06:46 PM #3Member
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 05012008, 07:41 PM #4
Heres a nice template for recursion
Java Code:public <modifier> recusiveAlg(You need some sort of parameter) { if(some sort of stopping criteria) { return something; } else { return recursiveAlg(your parameter  1) } }
hint: Fibonacci's numbers are the previous fib number + the one before the pervious fib number.My IP address is 127.0.0.1
 05012008, 07:51 PM #5Member
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hmmm correct me if i'm wrong but isn't it already implemented in the main function?
Java Code:if (n > 0) { int[][] pascal = Rows(n); for (int[] row : pascal) { for (int v : row) System.out.print(v + " "); System.out.println("");
Last edited by Magic101; 05012008 at 07:58 PM.
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