int toRead = atoi(argv[2]);

int toRead = atoi('1000000')

int atoi( const char *c )
{
  int value = 0;
  int sign = 1;
  if( *c == '+' || *c == '-' )
  {
     if( *c == '-' ) sign = -1;
     c++;
  }
  while ( isdigit( *c ) )
  {
     value *= 10;
     value += (int) (*c-'0');
     c++;
  }
  return value * sign;