taking default value of unsigned long int in unix

See more:

C++

#included every header file (i think)

int main(int argc, char* argv[])
{
  unsigned long long x=atoi(argv[1]);
  unsigned long long y=atoi(argv[2]);
  if(x>0 && x<=4294967295 && y>0 && y<=4294967295)
  {
    cout<<"done";
  }
  else
  {
    cout<<"not done";
  }
  return 0;
}

// But when i insert x=6543848485 or any value greater than 2254354363(10 digit)...
// It is automatically taking the default value of x=2147483647(automatically)... I donot y... and not entering in the else condition...

please help