2D Array Operations and Concepts

The video tutorial demonstrates how to calculate the sum of rows and columns in a 2D array. It begins by creating a simple 2D array and then shows how to use loops to calculate the sum of columns. The tutorial then explains how to modify the code to calculate row sums. Finally, it introduces a method to sum all elements in the array using nested loops, ensuring the correct placement of brackets and returning the total sum.

What is the main purpose of the program discussed in the video?

• To multiply all elements in a 2D array

• To find the maximum value in a 2D array

• To sort the elements of a 2D array

• To find the sum of rows and columns in a 2D array

What is the initial step in creating a 2D array in the program?

• Defining the size of the array

• Declaring the array variable

• Initializing the array with values

• Printing the array

How is the sum of a specific column calculated in the program?

• By using a built-in function

• By manually adding each element

• By using a nested loop

• By using a single loop iterating over rows

What is the initial value of the variable used to store the column total?

• None

• 10

• 0

• 1

How are the positions in the array indexed?

• I, II, III, IV

• A, B, C, D

• 1, 2, 3, 4

• 0, 1, 2, 3

What is the result of summing the first column in the example?

• 4

• 8

• 10

• 12

What change is needed to calculate the sum of a row instead of a column?

• Use a different data type

• Switch the loop to iterate over columns

• Change the array size

• Use a different variable for the sum

What is the sum of the second row in the example?

• 12

• 14

• 10

• 8

What is the purpose of the nested loop in the new method?

• To sort the array

• To sum all elements in the 2D array

• To find the maximum value in the array

• To find the minimum value in the array

What is the return type of the new method created to sum the entire array?

• double

• String

• void

• int