Array

14. Program

How to find out average of element of an int array ?

class U  
{
 public static void main(String args[])
 {
  int[] a = {10, 2, 5, 3, 9, 2, 8, 10, 11, 20, 10};
  double sum = 0;
  for(int i = 0; i < a.length; i++) 
  {
   sum = sum + a[i];
  }
  double avg = sum / a.length;
  System.out.println("Sum of element is : "+ sum);
  System.out.println("Average of element is : "+ avg);
  System.out.println("Length : "+ a.length);
 }
}

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15. Program

(Imp_Q) How to find out average of first half and second half element array ?

class V  
{
 public static void main(String args[])
 {
  int[] a = {10, 2, 5, 3, 9, 2, 8, 10, 11, 20};
  int mid = a.length / 2;
  double sum = 0;
  for(int i = 0; i < mid; i++) 
  {
   sum = sum + a[i];
  }
  double avg = sum / mid;
  System.out.println("Sum : "+ sum);
  System.out.println("Average of first half element is : "+ avg);
  System.out.println("-----------");
  sum = 0;
  avg = 0;
  for(int i = mid; i < a.length; i++)
  {
   sum = sum + a[i];
  }
  if(a.length % 2 != 0)
  {
   mid++;
  }
  avg = sum / mid;
  System.out.println("Sum : "+ sum);
  System.out.println("Average of second half element is : "+ avg);

 }
}  

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16. Program

How to find out average of even index and odd index element seperatly ?

class W  
{
 public static void main(String args[])
 {
  int[] a = {10, 2, 5, 3, 9, 2, 8, 10, 11, 20, 10};
  double sum = 0;
  int total = 0;
  for(int i = 0; i < a.length; i+=2) 
  {
   sum = sum + a[i];
   total++;
  }
  double avg = sum / total;
  System.out.println("Sum : "+ sum);
  System.out.println("Average of even index element is : "+ avg);
  System.out.println("-----------");
  sum = 0;
  avg = 0;
  total = 0;
  for(int i = 1; i < a.length; i+=2)
  {
   sum = sum + a[i];
   total++;
  }
  
  avg = sum / total;
  System.out.println("Sum : "+ sum);
  System.out.println("Average of odd index element is : "+ avg);
 }
}  

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