How to Split Array

#1

Good afternoon!

I am struggling to split an Array (A) of Size e.g. 10 into two other Arrays (B and C). Array B should contain all even elements of A and C, apparently, all odd elements of A.

Example:

A = [5, 4, 7, 2, 9, 6, 8, 11, 25, 17} ->

B = [5, 7, 9, 8, 25]

C = [4, 2, 6, 11, 17]

Best!

#2

Show your code attempt, otherwise we will not be able to offer advice on what you are doing wrong!

#3

You can use this code :

int A[10] = {5, 4, 7, 2, 9, 6, 8, 11, 25, 17};
  int B[5];
  int C[5];
  int indexB = 0;
  int indexC = 0;
  for ( int i = 0 ; i < 10 ; i++ )
     {
        if ( MathMod(i,2) == 0 )
           {
              Print( i, " B");
              B[indexB] = A[i];
              indexB++;
           }
        else
           {
              Print( i, " C");
              C[indexC] = A[i];
              indexC++;
           }
     }
#4

Thank you very much. It works very well.

#5

Here’s an alternative method for using a simple dynamic array-list so you won’t have to mess with the array sizing, and you can also sort…

#include <Arrays\ArrayInt.mqh>
class SplitArray : public CArrayInt
{
public:
   void AssignEven(const CArrayInt &arr)
   {
      Clear();
      for(int i=0;i<arr.Total();i++)
         if(arr[i]%2==0)
            Add(arr[i]);
   }   
   void AssignOdd(const CArrayInt &arr)
   {
      Clear();
      for(int i=0;i<arr.Total();i++)
         if(arr[i]%2!=0)
            Add(arr[i]);
   }
   void ToLog()
   {
      for(int i=0;i<Total();i++)
         Print(this[i]);
   }
};

void OnStart()
{  
   SplitArray all,even,odd;
   srand(_RandomSeed);
   for(int i=0;i<50;i++)
      all.Add(rand());
   even.AssignEven(all);
   even.Sort();
   odd.AssignOdd(all);
   odd.Sort();
   even.ToLog();
   odd.ToLog();
}