Question

The elements of an integer-valued array can be set to 0 (i.e., the array can be cleared) recursively as follows: An array of size 0 is already cleared; Otherwise, set the last of the uncleared elements of the array to 0, and clear the rest of the array Write a void method named clear that accepts an integer array, and the number of elements in the array and sets the elements of the array to 0.

Answer 1

The clear void method sets all elements of an integer array to 0 using recursion, with a base case of an array of size 0 and a recursive step that zeroes the last element and reduces the array size by one.

Step-by-step explanation:

The student's question involves writing a void method in programming to clear an integer array by setting all of its elements to 0 using recursion. A recursive method is a function that calls itself in order to break down the problem into smaller instances. Here is an example of how you might write the clear method in Java:

void clear(int[] array, int size) {
if (size == 0) {
// Base case: If the array is of size 0, it is already cleared.
return;
}
// Recursive case: Set the last element to 0 and call clear on the rest of the array.
array[size - 1] = 0;
clear(array, size - 1);
}

This method relies on the concept that an array of size 0 is already cleared, which serves as the base case for the recursion. If the size is greater than 0, the method sets the last element of the current array to 0 and calls itself with the reduced array size until it reaches the base case.

Answer 2

The method definition to this question can be given as:

Method definition:

public void clear(int[] arr, int num) //define method clear.

{

if (num == 0) //if block

{

return 0; return value.

}

else //else block

{

arr[num - 1] = 0; //assign value in arr.

return arr[]; //return value.

}

}

clear(arr, num - 1); //calling

Step-by-step explanation:

The description of the above method definition as follows:

• Firstly we define a method that is "clear" that does not return any value because its return type is "void". This method accepts two integer variables that are "arr[] and num" where arr[] is an array variable and num is an integer variable.
• Inside a method, we use a conditional statement in if block we check that num variable value is equal to 0. if this condition is true so, it will return 0 otherwise it will go to else block in else block it will assign value in variable arr[num-1] that is "0" and return arr value.