Java Question
Locate the largest element in a multidimensional arrays
I have to write a program using a method that returns the location of the largest element in a two dimensional array.
example
Enter the number of rows and columns of the array:
3 4
Enter the array:
23.5 35 2 10
4.5 3 45 3.5
35 44 5.5 9.6
the location of the largest element is at (1, 2)
I have finished my code but it isn't working. How can I fix it? All I got are the following errors:
symbol : variable maxvalue
location: class int[]
if (a[i][j] > largest.maxvalue)
^
homework1a.java:51: row is already defined in locateLargest(double[][])
double row = i;
^
homework1a.java:52: column is already defined in locateLargest(double[][])
double column = j;
^
homework1a.java:53: maxValue is already defined in locateLargest(double[][])
double maxValue = a[i][j];
^
homework1a.java:88: i is already defined in main(java.lang.String[])
for (int i = 0; i < 2; i++)
^
5 errors
My code
import java.util.Scanner;
public class hwm1 {
public static int[] locateLargest(double[][] a)
{
int[] largest = new int[2];
double row = 0;
double column = 0;
double maxValue = a[0][0];
for (int i = 0; i < a.length; i++)
{
for (int j = 0; j < a.length; j++)
{
if (a[i][j] > largest.maxvalue)
{
double row = i;
double column = j;
double maxValue = a[i][j];
}
}
}
return largest;
}
public static void main(String[] args)
{
//Create Scanner
Scanner input = new Scanner(System.in);
//User input rows and columns
System.out.println("Enter the number of rows and columns in the array: ");
int numberOfRows = input.nextInt();
int numberOfColumns = input.nextInt();
//User input data in array
System.out.println("Enter numbers into array: ");
//Create array
double[][] a = new double[numberOfRows][numberOfColumns];
for (int i = 0; i < a.length; i++)
{
for (int j = 0; j < a[i].length; j++)
{
a[i][j] = input.nextDouble();
}
int[] largest = locateLargest(a);
System.out.println("The location of the largest element is at "+ "("+largest[0] +", " + largest[1] + ")");
for (int i = 0; i < 2; i++)
{
System.out.print(largest[i]);
}
}
}
}
Answer Source
You are declaring the variables row, column and maxValue twice.
Also, in the line:
if (a[i][j] > largest.maxvalue)
There is no such thing as maxvalue in your code, and neither is it a member of largest
In this part of your code:
Since i is already declared in the outer for-loop, you don't need to declare it again. Just use:
...
for(i = 0; i < 2; i++){
...
}