Expt 1 - Part 1, Part 2 & Part 3

Explanation

This Java code demonstrates a fundamental programming task: copying all elements from one array to another.

The program begins by declaring and initializing an integer array named arr1 with the values 1, 2, 3, 4, 5. It then prints the contents of this arr1 to the console, labeling it as the "Original Array".

Next, it declares a second integer array called arr2. Crucially, arr2 is initialized with the same size as arr1 using new int[arr1.length], allocating new memory for it. At this point, arr2 contains default values (which are 0 for integer arrays).

The core logic of the program is a for loop. This loop iterates from the first element (index 0) up to, but not including, the length of arr1. In each iteration, it takes the element from arr1 at the current index i (i.e., arr1[i]) and assigns it to the corresponding position in arr2 (i.e., arr2[i]). This process effectively transfers each value from arr1 to arr2 one by one.

Finally, after all elements have been copied, the program prints the contents of arr2 to the console, labeling it as the "Copied Array", allowing us to verify that the copy operation was successful.

Algorithm

The algorithm used to copy array elements can be described as follows:

1. Declare and Initialize Source Array: Create an integer array (arr1) and populate it with initial values.
2. Display Source Array: Iterate through arr1 and print its elements to the console to show its original state.
3. Declare Destination Array: Create a new integer array (arr2) with the same size as arr1. This allocates new memory for the copy.
4. Copy Elements:
   • Initialize a loop counter (e.g., i) starting from 0.
   • Continue the loop as long as i is less than the length of arr1.
   • In each iteration, assign the element arr1[i] to arr2[i].
   • Increment i by 1 in each iteration.
5. Display Destination Array: Iterate through arr2 and print its elements to the console to confirm the successful copy.