Transferring User Input Into an Array

System.out.print(a[1][1] + "\t");

See how you have it hard coded to always display element at row 1, column 1. Even if you fix it as suggested in reply #1, I imagine your ouptut will be

0 0 0

0 3 0

0 0 0

because you have the same problem during the assigning of input phase.

floundera at 2007-7-12 1:30:54 >

//ask user to enter value for Row and Col

Thats my whole problem. Im lost for what I need to actually put there. I tried this but only got errors:

for (int row = 0; row < a.length; row++)

for (int col = 0; col < a[row].length; col++)

{System.out.println("Enter Row 1 of Matrix1: ");

a[row][col] = scan.nextInt();

System.out.print(a[row][col] + "\t");

System.out.println();

}

MacMurphya at 2007-7-12 1:30:54 >

how have to see how many rows and cols are there lets say

rows=2

cols=3

your array = new Array[rows][cols];

for(int x=0;x<rows;x++){

for(int y=0;y<cols;y++){

system.out.println("Enter value for" + x+ " and Col" + y);

int value = System.in.get.................

your array[row][cols] = value;

}

}

//show the data entered by users

for(int x=0;x<rows;x++){

for(int y=0;y<cols;y++){

system.out.println( your array[row][cols]);

}

}

Try to debug where you are doing wrong.

Might be there is some thing wrong in my code as i am directly writing here not testing it in any editor.>

jawadhashmia at 2007-7-12 1:30:54 >

Instead of

a[row][col] = input;

It should be

a[x][y] = input;

Right?

But with that I still have a problem. Output becomes:

Enter the length of the square matrix:

3

Enter Row 1 of Matrix1:

1 2 3

Enter Row 1 of Matrix1:

Enter Row 1 of Matrix1:

Enter Row 1 of Matrix1:

Exception in thread "main" java.util.NoSuchElementException

at java.util.Scanner.throwFor(Unknown Source)

at java.util.Scanner.next(Unknown Source)

at java.util.Scanner.nextInt(Unknown Source)

at java.util.Scanner.nextInt(Unknown Source)

at MatrixAddPro.main(MatrixAddPro.java:30)

MacMurphya at 2007-7-12 1:30:55 >

import java.util.Scanner;

public class MatrixAddPro

{

public static void main (String[] args)

{

int input, row, col;

Scanner scan = new Scanner(System.in);

System.out.println("Enter the length of the square matrix: ");

col = scan.nextInt();

row = col;

int[][] a = new int[row][col];

for (int x = 0; x < row; x++)

{

for (int y = 0; y < col; y++)

{System.out.println("Enter Row"+(x+1)+" Col"+ (y+1));

input = scan.nextInt();

a[x][y] = input;

}

}

for (int x = 0; x < row; x++)

{

for (int y = 0; y < col; y++)

{System.out.print(a[x][y] + "\t");

System.out.println();

}

}

}

}

OUTPUT:

Enter the length of the square matrix:

3

Enter Row1 Col1

1

Enter Row1 Col2

2

Enter Row1 Col3

3

Enter Row2 Col1

1

Enter Row2 Col2

2

Enter Row2 Col3

3

Enter Row3 Col1

1

Enter Row3 Col2

2

Enter Row3 Col3

3

1

2

3

1

2

3

1

2

3

Alright so now its not printing in rows...

Thanks for your patience/help guys.

MacMurphya at 2007-7-12 1:30:55 >

One last problem for this program. I am trying to find the product of two square matrices. I have this code:

//Finds the product of the two matrices.

for (int x3 = 0; x3 < row; x3++)

{

for (int y3 = 0; y3 < col; y3++)

for (int z = 0; z < 1; z++)

d[x3][y3] = a[x3][z] * b[z][y3] + a[x3][z + 1] * b[z + 1][y3] + a[x3][z + 2] * b[z + 2][y3] ;

}

I want z to keep being incremented as long as it makes sense. I only have it the way I have it now because it was a 3 columned and rowed matrix that I was testing. This wont work w/ 2 columned or 4 columned. Thanks for any help.

MacMurphya at 2007-7-12 1:30:55 >