Question

1- takes a 1D integer array arr as a parameter and returns a boolean value.

2- The method returns true if the argument array contains two distinct values such that the sum of those two values is equal to the first element of the array arr. Otherwise, it returns false.

3- Assume that arr contains only positive integers (greater than 0). Sample runs provided below.

4- Sample runs provided below.

5- Complete and place your code in the Question 3 box in the Answer Packet. Any code on this page will not be considered as part of your solution.

Argument Array arr Return value

75 89 45 50 1 30 49 true

81 3 27 9 1 24 false

88 5 44 19 44 91 false

12 7 4 1 5 true

Answer 1

import java.util.Scanner;
public class Main
{
   public static void main(String[] args)
   {
       Scanner sc = new Scanner(System.in);
       int n,i;
       System.out.print("Enter number of elements: ");
       n = sc.nextInt();
       int arr[] = new int[n];
       for(i=0;i<n;i++)
       arr[i] = sc.nextInt();
       boolean res;
       res = calculate(arr,n);
       System.out.print(res);
   }
   public static boolean calculate(int arr[],int n)
   {
   int sum=0,count=0,i,j;
   for(i=1;i<n;i++)
   {
   for(j=i+1;j<n;j++)
   {
   if(arr[0]==arr[i]+arr[j]&&(arr[i]!=arr[j]))
   count++;
   }
   }
   if(count!=0)
   return true;
   else
   return false;
   }
}