Question

2-Dimensional Array Operations.

Use a Java class with a main method.

In this class (after the main method), define and implement the following methods:

• public static void printArray. This method accepts a two-dimensional double array as its argument and prints all the values of the array, separated by a comma, each row in a separate line.
• public static double getAverage. This method accepts a two-dimensional double array as its argument and returns the average of all the values in the array.
• public static double getRowTotal. This method accepts a two-dimensional double array as its first argument and an integer value as its second argument. The second argument is the subscript of a row in the array. The method returns the total of the values in the specified row.
• public static double getLowestInColumn. This method accepts a two-dimensional double array as its first argument and an integer value as its second argument. The second argument is the subscript of a column in the array. The method should return the lowest value in the specified column of the array.

In the main method create and initialize a 2-dimensional array of double numbers and test all the methods described above.

Answer 1

public class Main
{
   public static void main(String[] args) {
       double p[][] = {{9,7,4},{1,6,3},{4,2,8}}; //Declaring 2d array
       printArray(p); //calling printArray function
       double ans;
       ans = getAverage(p); //calling getAverage function and storing result in ans
       System.out.println("Average of all elements is: "+ans); //printing the ans
       double sum;
       sum = getRowTotal(p,2); //calling getRowTotal function and storing result in sum
       System.out.println("Sum of row is: "+sum); //printing the sum of row with index 2
       double low;
       low = getLowestInColumn(p,2); //calling getLowestInColumn function and storing result in low
       System.out.println("Lowest in column is: "+low); //printing the low of column with index 2
   }
   public static void printArray(double p[][]) //printArray function
   {
   for(int i=0;i<3;i++)
   {
   for(int j=0;j<3;j++)
   {
   System.out.print(p[i][j]); //printing the elements
   System.out.printf(",");
   }
   System.out.printf("\n");
   }
   }
   public static double getAverage(double p[][]) //getAverage function
   {
   double sum=0,ans=0;
   for(int i=0;i<3;i++)
   {
   for(int j=0;j<3;j++)
   {
   sum = sum + p[i][j]; //adding the elements
   }
   }
   ans = sum / 9; //calculating the ans
   return ans; //returning the ans
   }
   public static double getRowTotal(double p[][],int q) //getRowTotal function
   {
   double ans=0;
   ans = p[q][0] + p[q][1] + p[q][2]; //adding the elements of row
   return ans; //returning the ans
   }
   public static double getLowestInColumn(double p[][],int q) //getLowestInColumn function
   {
   if(p[0][q]<p[1][q] && p[0][q]<p[2][q]) //cheking if first element in column is low
   return p[0][q];
   else if(p[1][q]<p[2][q]) //cheking if second element in column is low
   return p[1][q];
   else
   return p[2][q];
   }
}

Output:-