i'm almost ther , but still my code works incompletely.

[deerlittle7]

my professor said:i should get the sizeof array and then use modulus so i can apply merging.

example:
Input number of items to sort(must be divisible by 3, max of 18): 18 //it should be divisible by 3
input 18 numbers:51 60 80 2 9 5 22 100 11 13 15 8 3 33 30 120 150 107

phase1 sort:
file1: 51 60 80| 11 22 100| 3 30 33| it will be in order and it will merge and sort with file 2.
file2: 2 5 9| 8 13 15| 107 120 150|
phase1 merge:
file1:empty
file2:empty
file3:2 5 9 51 60 80|8 11 13 15 22 100|3 30 33 107 120 150|
phase2 sort:
file1: 2 5 9 51 60 80(it will merge/sort with file 2:8 11 13 15 22 100) |3 30 33 107 120 150|
file2:8 11 13 15 22 100|

phase 2 merge:
file3:2 5 8 9 11 13 15 22 51 60 80 100 |3 30 33 107 120 150

phase3 sort:
file1:2 5 8 9 11 13 15 22 51 60 80 100 //it will merge and sort with file2
file2:3 30 33 107 120 150

phase3(final merge!);
file3:2 3 5 8 9 11 13 15 22 30 33 51 60 80 100 107 120 150
the numbers are sorted in ascending order

#include <string.h>
#include <iostream>
#include <ctype.h>
#include <stdlib.h>
#include <time.h>
#include <conio.h>
#include <math.h>

using namespace std;


void TwoWayMerge(int*, int);
void printSort(int*, int);
void treeChopArray();
int main()
{
   
   
   int n,nmchk;
   int i=0;
   cout << "Input number of items to sort(must be divisible by 3, max of 18): ";
   cin >> n;
  nmchk=n%3;
  if(nmchk==0||nmchk>18)
  { int *integers=new int [n];

  
   cout << "Please enter the "<<n<<" numbers : \n\n";
   
   while ( i < n)
   {
       cout<<"input number "<<i+1<<": ";
       cin >> integers[i];
       i++;
   }
   TwoWayMerge(integers,n);
   printSort(integers, n);}
   {
   cout<<"error! size should be divisible by 3!\n"; main();
   }
  
 
}



void TwoWayMerge(int *q, int length)
{
	int m,t;
	for(m=0;m<length;m++)
	{
		for(t=0;t<m;t++)
		{
			if(q[m]<q[t])
			{
				int temp=q[m]; 
				q[m]=q[t];
				q[t]=temp;
			}

		}

	}

}
void treeChopArray()
{


}
void printSort(int *q, int length)
{
	int s=0;
	cout<<"file: ";
	
	
	for(s=0;s<length;s++)
	{
	cout<<q[s]<<" ";
	}
	cout<<"\n";
	main();
	
}

[Zaita]

http://www.cplusplus.com/forum/articles/1295/
You haven't asked a question.

  nmchk=n%3;
  if(nmchk==0||nmchk>18)

nmchk will never be > 3 so the or statement is pointless. Just write if ((n % 3) == 0)

int *integers=new int [n];. You don't ever free the memory thus creating a memory leak.

cin >> integers[i]; No type safety or input validation.
http://www.cplusplus.com/forum/articles/6046/

etc