Question

3. (5 pts) Write code for a Java method that takes in as input parameter an integer number, say num, and returns a double array of size num with all entries in the array initialized to 3.0.

public static double[] arrayInit (int num){ // You have to declare and create a result array to be returned

} //end arrayInit

4. (6 pts) Write code for a Java method that takes in two int arrays of the same size as input parameters, multiplies the corresponding entries, and returns the resulting int array. public static int[] product (int[] array1, int[] array2){ // You have to declare and create a result array to be returned

} // end product

Answer 1

import java.util.*;
public class Main
{
   public static void main(String[] args) {
   Scanner sc = new Scanner(System.in);
   int num;
       System.out.print("Enter num: ");
       num=sc.nextInt();
       double result[]=arrayInit(num);
       for(int i=0;i<2*num;i++)
       System.out.print(result[i]+" ");
      
      
   }
   public static double[] arrayInit (int num){
   double r[] =new double[2*num];
   for(int i=0;i<2*num;i++)
   r[i]=3.0;
  
   return r;
  
   }
}

import java.util.*;
public class Main
{
   public static void main(String[] args) {
   Scanner sc = new Scanner(System.in);
   int n;
       System.out.print("Enter size of array: ");
       n=sc.nextInt();
   int a[]=new int[n];
   int b[]=new int[n];
   System.out.print("Enter value in array1: ");
   for(int i=0;i<n;i++)
   a[i]=sc.nextInt();
     
   System.out.print("Enter value in array2: ");
   for(int i=0;i<n;i++)
   b[i]=sc.nextInt();
     
   int c[]=product (a, b);
   for(int i=0;i<n;i++)
   System.out.print(c[i]+" ");
     
     
      
      
   }
public static int[] product (int[] array1, int[] array2){
int result[] = new int[array1.length];
for(int i=0;i<array1.length;i++)
result[i]=array1[i]*array2[i];
  
  
return result;
  
}
}