Hello I have a project in which I must merge two text files which contain a variable number of numbers. Both of these text files are sorted from lowest to highest value and when they are merged into one list must retain this property.

My friend and I were working on developing code for this but we have no idea if this is right. This is what we have so far...
Code:
#include <iostream>
#include <string>
#include <fstream>
#include <sstream>
#include <cstdlib>
#include <vector>
#include <list>

int main(int argc, char argv[])
{

  using namespace std; 
  
  ifstream in_stream1;
  ofstream out_stream;
  ifstream in_stream2;

  in_stream1.open("prob2list1.txt");
  in_stream2.open("prob2list2.txt");
  out_stream.open("prob2merged.txt");
  
  int num1;
  int num2;
  int i;
  int j;

  int mergeList[10000];
 
 
  while(in_stream1.eof!=0)
    {
      in_stream1>>num1;
      mergeList[i]= num1;
      i++;
    }
  
  while(j<i)
    {
      in_stream2>>num2;
      if(mergeList[j]>num2)
	j++;
      else 
	{
	  if(j==0)
	    {
	      mergeList.insert(j,1);
	      mergeList[0]=num2;
	    }
	  else
	    {
	      mergeList.insert(j,1);
	      mergeList[j-1]=num2;
	    }
	  j++;
	}
    }

  return 0;
 }
We're really quite confused and so we just tried to sort if using a really,really large array but when we try to compile it we receive these errors:

Line 30 - Error:Invalid use of member<did you forget the &?>
Line 46 - Error:Request for member 'insert' in 'mergeList', which is of non-class type 'int[10000]'
Line 51 - Error:Request for member 'insert' in 'mergeList', which is of non-class type 'int[10000]'

I know this code probably won't do the job in the first place and so any assistance would be greatly appreciated,thanks.