lab08/Interfaces/csvgetline2.c
char* csvfield( int n )
{
	if( n<0 || n>=nfield )
		return NULL ;
	return field[n] ;
}
/* csvfield:  return pointer to n-th field */
return pointer to n-th field
return pointer to n - th field
char* csvfield( int n )
{
	if( n<0 || n>=nfield )
		return NULL ;
	return field[n] ;
}
char * csvfield ( int n ) { if ( n < 0 || n >= nfield ) return NULL ; return field [ n ] ; }
csvfield:  return pointer to n-th field
csvfield : return pointer to n - th field