Question
In: Computer Science
How do I convert the integers in my 2D array list to output decimals numbers? My...
How do I convert the integers in my 2D array list to output decimals numbers? My program works accepting regular integers, but crashes when decimals are entered into my 2D array list.
Can someone improve it so it accepts decimal numbers? Here is my code:
import javax.swing.*;
import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;
public class TwoDimArray
{
private int numbers[][];
public TwoDimArray()
{
loadArray();
}
public void loadArray()
{
/*
//loadArray() method loads the users defined filename
//@return returns the file's contents
*/
String fileName = "";
try
{
fileName = JOptionPane.showInputDialog("Enter full file path name:");
}
catch(Exception e)
{
JOptionPane.showMessageDialog(null, "File cannot be open" + fileName + "to read");
return;
}
try
{
Scanner in = new Scanner(new File(fileName));
int row, col;
row = in.nextInt();
col = in.nextInt();
numbers = new int[row][col];
for(int i = 0; i < row;i++)
{
for (int j = 0;j < col; ++j)
{
numbers[i][j] = in.nextInt();
}
}
in.close();
}
catch(FileNotFoundException e)
{
JOptionPane.showMessageDialog(null, "file cannot be opened" + fileName +"to read");
}
}
public int displayMaxValue()
{
int high = Integer.MIN_VALUE;
for(int i = 0;i < numbers.length; i++)
{
for(int j = 0;j < numbers[0].length; ++j)
{
if (numbers[i][j] > high)
{
high = numbers[i][j];
}
}
}
return high;
}
public int displayMinValue()
{
int low = Integer.MAX_VALUE;
for(int i = 0;i < numbers.length; i++)
{
for(int j = 0;j < numbers[0].length; ++j)
{
if(numbers[i][j] < low)
{
low = numbers[i][j];
}
}
}
return low;
}
public static int displayTotal(int[][] array)
{
int total = 0;
for(int row = 0;row < array.length;row++)
{
for(int col = 0;col < array[row].length;col++)
{
total += array[row][col];
}
}
return total;
}
public int displayAverage()
{
return displayTotal(numbers) / grabElementCounter(numbers);
}
public static int grabElementCounter(int[][] array)
{
int count = 0;
for(int row = 0;row < array.length; row++)
{
count += array[row].length;
}
return count;
}
public int displayRowTotal(int row)
{
int total = 0;
for(int col = 0; col < numbers[row].length; col++)
{
total += numbers[row][col];
}
return total;
}
public int displayColumnTotal(int col)
{
int total = 0;
for(int row = 0;row < numbers.length; row++)
{
total += numbers[row][col];
}
return total;
}
public int getHighestValue(int row)
{
int high = numbers[row][0];
for (int col = 1; col < numbers[row].length; col++)
{
if(numbers[row][col] > high)
{
high = numbers[row][col];
}
}
return high;
}
public int getLowestValue(int row)
{
int low = numbers[row][0];
for (int col = 1; col < numbers[row].length; col++)
{
if(numbers[row][col] < low)
{
low = numbers[row][col];
}
}
return low;
}
public static void main(String[] args)
{
TwoDimArray twoDimArray = new TwoDimArray();
System.out.println("Average: "+twoDimArray.displayAverage());
System.out.println("Min value: "+twoDimArray.displayMinValue());
System.out.println("Max value :"+twoDimArray.displayMaxValue());
System.out.println("First Row Total: "+twoDimArray.displayRowTotal(0));
System.out.println("First Column Total: "+twoDimArray.displayColumnTotal(0));
System.out.println("The lowest value in the first row is: "+twoDimArray.getLowestValue(0));
System.out.println("The highest value in the first row is: "+twoDimArray.getHighestValue(0));
} //end main function
} // end array
Solutions
Expert Solution
import javax.swing.*;
import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;
public class TwoDimArray
{
private double numbers[][];
public TwoDimArray()
{
loadArray();
}
public void loadArray()
{
/*
//loadArray() method loads the users defined filename
//@return returns the file's contents
*/
String fileName = "";
try
{
fileName = JOptionPane.showInputDialog("Enter full file path name:");
}
catch(Exception e)
{
JOptionPane.showMessageDialog(null, "File cannot be open" + fileName + "to read");
return;
}
try
{
Scanner in = new Scanner(new File(fileName));
int row, col;
row = in.nextInt();
col = in.nextInt();
numbers = new double[row][col];
for(int i = 0; i < row;i++)
{
for (int j = 0;j < col; ++j)
{
numbers[i][j] = in.nextDouble();
}
}
in.close();
}
catch(FileNotFoundException e)
{
JOptionPane.showMessageDialog(null, "file cannot be opened" + fileName +"to read");
}
}
public double displayMaxValue()
{
double high = Integer.MIN_VALUE;
for(int i = 0;i < numbers.length; i++)
{
for(int j = 0;j < numbers[0].length; ++j)
{
if (numbers[i][j] > high)
{
high = numbers[i][j];
}
}
}
return high;
}
public double displayMinValue()
{
double low = Integer.MAX_VALUE;
for(int i = 0;i < numbers.length; i++)
{
for(int j = 0;j < numbers[0].length; ++j)
{
if(numbers[i][j] < low)
{
low = numbers[i][j];
}
}
}
return low;
}
public static int displayTotal(double[][] array)
{
int total = 0;
for(int row = 0;row < array.length;row++)
{
for(int col = 0;col < array[row].length;col++)
{
total += array[row][col];
}
}
return total;
}
public double displayAverage()
{
return displayTotal(numbers) / grabElementCounter(numbers);
}
public static int grabElementCounter(double[][] array)
{
int count = 0;
for(int row = 0;row < array.length; row++)
{
count += array[row].length;
}
return count;
}
public int displayRowTotal(int row)
{
int total = 0;
for(int col = 0; col < numbers[row].length; col++)
{
total += numbers[row][col];
}
return total;
}
public double displayColumnTotal(int col)
{
double total = 0;
for(int row = 0;row < numbers.length; row++)
{
total += numbers[row][col];
}
return total;
}
public double getHighestValue(int row)
{
double high = numbers[row][0];
for (int col = 1; col < numbers[row].length; col++)
{
if(numbers[row][col] > high)
{
high = numbers[row][col];
}
}
return high;
}
public double getLowestValue(int row)
{
double low = numbers[row][0];
for (int col = 1; col < numbers[row].length; col++)
{
if(numbers[row][col] < low)
{
low = numbers[row][col];
}
}
return low;
}
public static void main(String[] args)
{
TwoDimArray twoDimArray = new TwoDimArray();
System.out.println("Average: "+twoDimArray.displayAverage());
System.out.println("Min value: "+twoDimArray.displayMinValue());
System.out.println("Max value :"+twoDimArray.displayMaxValue());
System.out.println("First Row Total: "+twoDimArray.displayRowTotal(0));
System.out.println("First Column Total: "+twoDimArray.displayColumnTotal(0));
System.out.println("The lowest value in the first row is: "+twoDimArray.getLowestValue(0));
System.out.println("The highest value in the first row is: "+twoDimArray.getHighestValue(0));
} //end main function
}
Issue: You have declared array as int so that is the reason you are not able to read double so now I have changed to double so that we can read both int and double
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