Programming Forums > Application Development > Java

paulchwd · Apr 15th, 2007, 1:28 AM

Hi,

i want to get the size of a matrix from a user at the command line and then prompt them to enter the values to be stored in the matrix,

i cant wrap my head around 2d arrays (programming them, can you help me pls.

thnx x10

titaniumdecoy · Apr 15th, 2007, 1:54 AM

If you know how to get user input, then creating a 2D array is simple enough:

(Toggle Plain Text)

int[][] matrix = new int[numRows][numCols];

You can access a specific element of the array as matrix[row][col].

If you need more help, your best bet would be to search the web for answers. A Google search for "2d array java" turns up a multitude of resources.

paulchwd · Apr 15th, 2007, 12:40 PM

im am using stringtokenizer to tokenize the user input (first row of data), but where do i put the while(st.hasMoreTokens()) loop?, here is my code:

(Toggle Plain Text)

StringTokenizer st = new StringTokenizer(data);
  
      
		     for (int i=0; i<=row-1; i++ )
		     {
				System.out.println("I= " + i);

			    for(int j=0; j<=col-1; i++)
			    {

  				  System.out.println("J= " + j);
				  addArray1[i][j]=Integer.parseInt(st.nextToken());
			   			     
			    }
    		  
		    }

thnx x 10

titaniumdecoy · Apr 15th, 2007, 3:04 PM

Will you please stop rating all your threads 5 stars? The exclamation mark sign isn't necessary either. Your posts will be read.

If you expect the user to enter a specific number of tokens, a for loop would likely be preferable to a while loop.

Apr 15th, 2007, 1:28 AM	#1
paulchwd Hobbyist Programmer Join Date: Mar 2005 Posts: 139 Rep Power: 4	Matrices Hi, i want to get the size of a matrix from a user at the command line and then prompt them to enter the values to be stored in the matrix, i cant wrap my head around 2d arrays (programming them, can you help me pls. thnx x10

Apr 15th, 2007, 1:54 AM	#2
titaniumdecoy Expert Programmer Join Date: Nov 2005 Posts: 841 Rep Power: 3	If you know how to get user input, then creating a 2D array is simple enough: (Toggle Plain Text) int[][] matrix = new int[numRows][numCols]; int[][] matrix = new int[numRows][numCols]; You can access a specific element of the array as matrix[row][col]. If you need more help, your best bet would be to search the web for answers. A Google search for "2d array java" turns up a multitude of resources.

Apr 15th, 2007, 12:40 PM	#3
paulchwd Hobbyist Programmer Join Date: Mar 2005 Posts: 139 Rep Power: 4	im am using stringtokenizer to tokenize the user input (first row of data), but where do i put the while(st.hasMoreTokens()) loop?, here is my code: (Toggle Plain Text) StringTokenizer st = new StringTokenizer(data); for (int i=0; i<=row-1; i++ ) { System.out.println("I= " + i); for(int j=0; j<=col-1; i++) { System.out.println("J= " + j); addArray1[i][j]=Integer.parseInt(st.nextToken()); } } StringTokenizer st = new StringTokenizer(data); for (int i=0; i<=row-1; i++ ) { System.out.println("I= " + i); for(int j=0; j<=col-1; i++) { System.out.println("J= " + j); addArray1[i][j]=Integer.parseInt(st.nextToken()); } } thnx x 10

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Apr 15th, 2007, 3:04 PM	#4
titaniumdecoy Expert Programmer Join Date: Nov 2005 Posts: 841 Rep Power: 3	Will you please stop rating all your threads 5 stars? The exclamation mark sign isn't necessary either. Your posts will be read. If you expect the user to enter a specific number of tokens, a for loop would likely be preferable to a while loop.

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Programming Forums > Application Development > Java

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