Question

Write a public static method diagSum, which takes a 2d array of int values as a parameter, and returns the sum of the elements in the lead diagonal as an int value. The lead diagonal is defined as the diagonal line of values starting in the top left corner and proceeding one step right and down for each value until either the bottom or right edge of the array is reached. For example, in the array represented below, the numbers in red make up the lead diagonal

Answer 1

A 2d array (i.e. 2 dimensional array) represents its elements in rows and columns

The program in Java

The method in Java, where comments are used to explain each line is as follows

//This defines the method

public static int diagSum(int[][] myArray) {

    //This initializes sum to 0

    int sum = 0;

    //This iterates through each row of the array

               for (int i = 0; i < myArray.length; i++) {

                   //This calculates the sum of the diagonals

                       sum+=myArray[i][i];

               }

               //This returns the sum

               return sum;

       }

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