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 03072009, 03:45 AM #1Member
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What did i do wrong on thing method?
What did i do wrong on thing("this") method?
i recieved an error that the program is out of bound
i know i did someting wrong with the method in greed text.
Im looking at it and i cant find out where the error occurs.
can someone please tell me?
Java Code:import java.util.Scanner; public class sort2D { public static void main (String [] args) { Scanner input = new Scanner(System.in); System.out.println("Enter an integer for number of rows range from 3 to 10: "); int m = input.nextInt(); while (m<3  m>10) { System.out.println("Enter an integer for number of rows range from 3 to 10 again: "); m = input.nextInt(); } System.out.println("Enter an integer for number of columns range from 3 to 10: "); int n = input.nextInt(); while (n<3  n>10) { System.out.println("Enter an integer for number of columns range from 3 to 10 again: "); n = input.nextInt(); } int [] [] arr = new int [m] [n]; //generate random numbers for (int i=0; i<arr.length; i++) { for (int j=0; j<arr[n].length; j++) { arr [i][j]= (int)((Math.random()*30)+1); } } //display arr int [][] arr1 = decRow(arr); for (int i=0; i<arr.length; i++) { for(int j=0; j<arr[n].length; j++) { System.out.print(arr1[i][j]+" "); } } }//end of main [COLOR="SeaGreen"]//method for sorting numbers in each row public static int[][] decRow(int[][] arr) { int [][] newArr = new int[arr.length][arr[0].length]; for (int i=0; i<arr.length; i++) { for (int j = arr.length  1; j >= 1; j) { int max = arr[i][0]; int maxloc =0; for (int k=1; k<=j; k++) { if(max<arr[i][k]) { max = arr[i][k]; maxloc = j; } } if (maxloc != j) { newArr[i][maxloc] = arr[i][j]; newArr[i][j] = max; } } } return newArr; }[/COLOR] }//end of class
Last edited by PureAwesomeness; 03072009 at 03:56 AM.
 03072009, 04:00 AM #2Senior Member
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please let us know exactly what and where your error is. i don't see any thing("this") method
 03072009, 04:05 AM #3Member
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please let us know exactly what and where your error is. i don't see any thing("this") method
i need someone help me check the method in green code
which is the one below
Java Code://method for sorting numbers in each row public static int[][] decRow(int[][] arr) { int [][] newArr = new int[arr.length][arr[0].length]; for (int i=0; i<arr.length; i++) { for (int j = arr.length  1; j >= 1; j) { int max = arr[i][0]; int maxloc =0; for (int k=1; k<=j; k++) { if(max<arr[i][k]) { max = arr[i][k]; maxloc = j; } } if (maxloc != j) { newArr[i][maxloc] = arr[i][j]; newArr[i][j] = max; } } } return newArr; }
 03072009, 05:03 AM #4
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Again, can you explain what your method suppose to do.
 03072009, 05:23 AM #5Member
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sorry! that i didnt explain what the this method suppose to do
i think i figured out the "out of bound error"
example
5213
4562
0542
the ideal output is
5321
6542
5420
im trying to use selection sort for the numbers in each row
Java Code://method for sorting numbers in decending order in each rows public static int[][] decRow(int[][] arr) { int [][] newArr = new int[arr.length][arr[0].length]; for (int i=0; i<arr.length; i++) { for (int j =1; j <= arr[0].length  1; j++) { int min = arr[i][0]; int minloc =0; for (int k=1; k<=j; k++) { if(min>arr[i][k]) { min = arr[i][k]; minloc = j; } } if (minloc != j) { newArr[i][minloc] = arr[i][j]; newArr[i][j] = min; } } } return newArr; }
 03072009, 05:26 AM #6
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How did you match the input into 2D array?
 03072009, 06:00 AM #7Member
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How did you match the input into 2D array?
 03072009, 06:05 AM #8
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Your input is this.
5213
4562
0542
But you want to pass 2D array, into the method decRow. How did you match those two.
 03072009, 06:28 AM #9Member
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that is just an example
i create an array and generate random numbers with in it then pass it to the method
is this what you meant?
Java Code:import java.util.Scanner; public class sort2D { public static void main (String [] args) { Scanner input = new Scanner(System.in); System.out.println("Enter an integer for number of rows range from 3 to 10: "); int m = input.nextInt(); while (m<3  m>10) { System.out.println("Enter an integer for number of rows range from 3 to 10 again: "); m = input.nextInt(); } System.out.println("Enter an integer for number of columns range from 3 to 10: "); int n = input.nextInt(); while (n<3  n>10) { System.out.println("Enter an integer for number of columns range from 3 to 10 again: "); n = input.nextInt(); } int [] [] arr = new int [m] [n]; //generate random numbers for (int i=0; i<arr.length; i++) { for (int j=0; j<arr[n].length; j++) { arr [i][j]= (int)((Math.random()*30)+1); } } //display arr int [][] arr1 = decRow(arr); for (int i=0; i<arr.length; i++) { for(int j=0; j<arr[n].length; j++) { System.out.print(arr1[i][j]+" "); } }
 03082009, 09:37 AM #10
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Ya, it's fine. Reason to ask that question is your requirement is not clear. Better to explain it more clearly. Your code posted earlier and the input/output make some messup.
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