#include <stdio.h>

int main(void)
{
	int number, bitmask, nibblemask;
	int row, col;
   FILE *fp;

	if( NULL == (fp = fopen("hextable.txt", "wt")) )
		return(-1);

	// --- HEX REFERENCE TABLE ----------------------------

	// Print Header
	fprintf(fp, "\n");
	fprintf(fp, "Hexadecimal Reference Table\n");
	fprintf(fp, "\n");

	fprintf(fp, " HEX | DEC |  BIN | 2's | 1's | x16 |  /16   |\n");
	fprintf(fp, "=====|=====|======|=====|=====|=====|========|\n");

	nibblemask = 0x000F;
	for(row = 0; row < 16; row++)
	{
		fprintf(fp, "  %1X  |", row);
		fprintf(fp, "  %2i |", row);
		fprintf(fp, " ");
		bitmask = 0x0010;
		while( (bitmask /= 2) > 0)
		{
			if( row & bitmask )
				fprintf(fp, "1");
			else
				fprintf(fp, "0");
		}
		fprintf(fp, " |");
		fprintf(fp, "  %1X  |", nibblemask&(-row));
		fprintf(fp, "  %1X  |", nibblemask&(~row));
		fprintf(fp, " %3i |", row*16);
		fprintf(fp, " %6.4f |", (double)row / (double)16);
		fprintf(fp, "\n");
	}
	fprintf(fp, "\n");

	// --- HEX ADDITION TABLE -----------------------------

	// Print Header
	fprintf(fp, "\n");
	fprintf(fp, "Hexadecimal Addition Table\n");
	fprintf(fp, "\n");

	fprintf(fp, " +|");
	for(col = 0; col < 16; col++)
	{
		fprintf(fp, "%2X|", col);
	}
	fprintf(fp, "\n");

	fprintf(fp, "===");
	for(col = 0; col < 16; col++)
	{
		fprintf(fp, "===");
	}
	fprintf(fp, "\n");

	// Print Table
	for(row = 0; row < 16; row++)
	{
		fprintf(fp, "%2X|", row);
		for(col = 0; col < 16; col++)
		{
			number = row + col;
			fprintf(fp, "%2X|", number);
		}
		fprintf(fp, "\n");
	}

	// --- HEX MULTIPLICATION TABLE -----------------------

	// Print Table Header
	fprintf(fp, "\n");
	fprintf(fp, "Hexadecimal Multiplication Table\n");
	fprintf(fp, "\n");

	fprintf(fp, " *|");
	for(col = 0; col < 16; col++)
	{
		fprintf(fp, "%2X|", col);
	}
	fprintf(fp, "\n");

	fprintf(fp, "===");
	for(col = 0; col < 16; col++)
	{
		fprintf(fp, "===");
	}
	fprintf(fp, "\n");

	// Print Table
	for(row = 0; row < 16; row++)
	{
		fprintf(fp, "%2X|", row);
		for(col = 0; col < 16; col++)
		{
			number = row * col;
			fprintf(fp, "%2X|", number);
		}
		fprintf(fp, "\n");
	}

	return(0);
}