Array

31. Program

(Imp_Q) Write a program to swap odd indexed element with even indexed element ? 

class O
{
 public static void main(String args[])
 {
  int[] a = {3, 9, 20, 45, 50, 200, 401, 500, 600, 808, 909};
  int temp = 0;
  for(int i = 0; i < a.length; i++)
  {
   System.out.print(a[i] + " ,");
  }
  System.out.println();
  for(int i = 0; i < a.length-1; i+=2)
  {
   temp = a[i];
   a[i] = a[i+1];
   a[i+1] = temp;
  }
  System.out.println();
  for(int i = 0; i < a.length; i++)
  {
   System.out.print(a[i] + " ,");
  }
 }
}  

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32. Program

(Imp_Q) Find out the index of an array, left elements sum should be same as right elements sum ?

class D
{
 public static void main(String args[])
 {
  int[] a = {2, 4, 4, 2, 4, 7, 4, 5};
  int endindex = a.length - 1;
  int startindex = 0;
  int sumLeft = 0;  
  int sumRight = 0;
  while(true)
  {
   if(sumLeft > sumRight)
   {
    sumRight += a[endindex--];
   }
   else
   {
    sumLeft += a[startindex++];
   }
   if(startindex > endindex)
   {
    if(sumLeft == sumRight)
    {
     System.out.println(endindex);
    }
    else
    {
     System.out.println("doesn't have");
    }
    break; 
   }
  }
 }
}  

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