Question

Write a program with a function which accepts an array of integers and a key value. The
function should return the sum of all the multiples of the key value in the array. For example,
for the array {1, 4, 10, 12, 15, 20, 22} and the key value 5, the function should return the sum
10+15+20.

Answer 1

Answer:

import java.util.Scanner;

public class Main {

   public static int solve(int[] arr, int key) {

       int sum = 0;

       for(int i: arr) {

           if(i % key == 0)

               sum += i;

       }

       return sum;

   }

   public static void main(String[] args) {

       Scanner sc = new Scanner(System.in);

       System.out.println("Enter the length of the array : ");

       int n = sc.nextInt();

       int[] arr = new int[n];

       int i = 0;

       while(n-- > 0) {

           int number = sc.nextInt();

           arr[i] = number;

           i++;

       }

       System.out.println("Enter the key value : ");

       int key = sc.nextInt();

       

       int result = solve(arr, key);

       System.out.println(result);

   }

}

Explanation:

1. We are asking the user for the length of the array
2. Then we are creating the array and setting the length of the array
3. We are then accepting the numbers from the users and appending to the array.
4. After that, we accept the key value from the user again and store it in a variable called "key".
5. We are then passing the array as well as the key value as the parameter to our main function named "solve".
6. The "solve" function will iterate through the array and check for each number if when it is divided with the key value, does it return 0 as the remainder (eg. 20/5 = quotient = 4, remainder = 0), If true then store the number is a variable called "sum" and return the value.
7. The "solve" function will return the value which will be stored in the "result" variable.
8. The Last step, we will print the "result" variable to the console.