c++ part 1 backup

#include <iostream>
#include <cstdlib>//
#include <ctime>//needed to seed random function
using namespace std;


char randomiser(unsigned long long int randTotal)
{
  cout << randTotal << " recieved as input" <<endl;
  srand(time(NULL));
  unsigned long long int randomNum;//random integer 0-3
  char randChar;//random character A, T, C or G
  for(long long int randIndex = 1; randIndex<=randTotal; randIndex++)
  {
    randomNum = rand() %4;
    switch(randomNum)
    {
      case 0:
        randChar = 'A';
        break;

      case 1:
        randChar = 'T';
        break;

      case 2:
        randChar = 'G';
        break;

      case 3:
        randChar = 'C';
        break;
      default:
        cout << "error!" << endl;
        break;
    }
    cout << randIndex << " " << randomNum << " " << randChar << endl;
  }
  return randChar;
}

int main()
{
  unsigned long long int randTotal;//unsigned means can only store positive or zero values
  cout << "How many random characters do you want to generate?" << endl;
  cin >> randTotal;
  randomiser(randTotal);
  return 0;
}