Solution Review: Recursive Base Converter

#include <stdio.h>

void converter ( int n, int base ) ;

int main( )
{
	int num, base ;
	num = 18 , base = 16;
	converter ( num, base ) ; 
	return 0 ;
}

void converter ( int n, int base )
{
	int  r ;
	r = n % base ;
	n = n / base ;
	if ( n != 0 )
		converter ( n, base ) ;
	if ( r <= 9 )
		printf ( "%d", r ) ;
	else
		printf ( "%c", 'A' + r % 10 ) ;		
}