Find minimum and maximum value for two dimensional array

Hi, I have been beating my head against the wall trying to figure this out.  I am trying to figure out the minimum and maximum value for a single row.  I have added the values from three rows of a two dimensional array into a fourth row and I want to get the minimum and maximum value from the row but I can't seem to figure it out.  The code below gives me weird results.  I set my min and max at [3][0] because I only want to scan row 3.  Thanks for the help.

int min = sales[3][0];

      for (int row = 3; row < sales.length; row++)
                  for (int column = 0; column < grades.length; column++)
                        if (sales[row][column] < min)
                        min = sales[row][column];

      int max = grades[3][0];

      for (int row = 0; row < sales.length; row++)
            for (int column = 0; column < sales.length; column++)
                  if (sales[row][column] > max)
                  max = sales[row][column];
Who is Participating?

Improve company productivity with a Business Account.Sign Up

CEHJConnect With a Mentor Commented:
You can do something like
    public static int[] getMinMax(int[] a) {
	int max = Integer.MIN_VALUE;
	int min = Integer.MAX_VALUE;
	for(int i = 0;i < a.length;i++) {	
	    min = Math.min(min, a[i]);
	    max = Math.max(max, a[i]);
	return new int[] { min, max };

Open in new window

>>    for (int row = 3; row < sales.length; row++)>>            {>>                  for (int column = 0; column < grades.length; column++)Why are you mixing sales and grades matrices in this double for loop?
[3][0] would essentially  give you an empty matrix
Free Tool: Path Explorer

An intuitive utility to help find the CSS path to UI elements on a webpage. These paths are used frequently in a variety of front-end development and QA automation tasks.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

Addressing the matrix is done theoretically as


so row iteration is done using the first dimension. To give you at least one element (column) in the row, see that col >= 1 when the matrix is created
Based on the question title, I would assume you need the min and max values for the individual elements in the whole array.  If so, then why two seperate loops for min and max, and why the extra dimension?

int min = sales[0][0];
int max = sales[0][0];
for( row = 0; row < ROW_COUNT; row++ )
  for( col = 0; col < COLUMN_COUNT; col++)
    if( sales[row][col] < min )
      min = sales[row][col]
    if( sales[row][col] > max )
      max = sales[row][col]
dhatlasAuthor Commented:
I would have an array like this for example:

0 {1,2,3,4,5,6,7,8,9,10}
1 {1,2,3,4,5,6,7,8,9,10}
2 {1,2,3,4,5,6,7,8,9,10}
3 {3,6,9,12,15,18,21,24,27,30) Totals row

I want to get the minimum and the maximum value from the total sales in row 3.  I don't care about searching the values in rows 0 - 2.
dhatlasAuthor Commented:
Interesting, so how would I call that method?  I mean to display the results:
For example:

System.out.println("Lowest total sales for the month are  " + method call?)
System.out.println("Lowest total sales for the month are  " + getMinMax(array)[0]);
dhatlasAuthor Commented:
Great.  Thanks.
Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

All Courses

From novice to tech pro — start learning today.