written_牙列缺损

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

static char	*digits[] = {
	"", "ONE ", "TWO ", "THREE ", "FOUR ", "FIVE ", "SIX ", "SEVEN ",
	"EIGHT ", "NINE ", "TEN ", "ELEVEN ", "TWELVE ", "THIRTEEN ",
	"FOURTEEN ", "FIFTEEN ", "SEXTEEN ", "SEVENTEEN ", "EIGHTEEN ",
	"NINETEEN "
};

static char *tens[] = {
	"", "", "TWENTY ", "THIRTY ", "FORTY ", "FIFTY ", "SIXTY ", "SEVENTY ",
	"EIGHTY ", "NINETY "
};

static char *magnitudes[] = {
	"", "THOUSAND ", "MILLION ", "BILLION "
};

static void
do_one_group( unsigned int amount, char *buffer, char **magnitude )
{
	int		value;

	value = amount / 1000;
	if( value > 0 )
		do_one_group( value, buffer, magnitude + 1 );

	amount %= 1000;
	value = amount / 100;
	if( value > 0 )
	{
		strcat( buffer, digits[ value ] );
		strcat( buffer, "HUNDRED " );
	}

	value = amount % 100;

	if( value >= 20 )
	{
		strcat( buffer, tens[ value / 10 ] );
		value %= 10;
	}
	if( value > 0 )
		strcat( buffer, digits[ value ] );

	if( amount > 0 )
		strcat( buffer, *magnitude );
}

void 
written_amount( unsigned int amount, char *buffer )
{
	if( amount == 0 )
		strcpy (buffer, "ZERO ");
	else
	{
		*buffer = '\0';						//   ， ;
		do_one_group( amount, buffer, magnitudes );
	}
}

int 
main()
{
	unsigned int		amount;
	char    buffer[ 256 ];
	printf( "  ： " );
	scanf( "%u", &amount );
	written_amount( amount, buffer );
    printf( "
 %s ", buffer );	
	return 0;
}