/*
 * Program to calculate the depth and double-depth of threads with
 * a v-form threading tool.
 *
 *	21 April 1998
 */

#include <stdio.h>

main(argc, argv)
	int             argc;
	char           *argv[];
{

	double          ddepth,
			depth,
			fdepth,
			input,
			pitch,
			tpi,
			atof();

	int             metric;

	metric = 0;

	/*
	 * do we have all the arguments?
	 */
	if (argc < 2) {
		fprintf(stderr,
			"\nUsage:\n\t%s TPI\n\t\tor\n\t%s -m pitch\n\n",
			argv[0], argv[0]);
		exit(1);
	}

	/*
	 * Get the arugments from the command line
	 */
	if (argv[1][0] == '-') {
			/*
			 * if it starts with a dash -- it has to be an option
			 */
		if ( argv[1][1] == 'm' ){
			input = atof(argv[2]);
			metric++;
		} else {
			fprintf( stderr, "\n%s: Unknown switch!\n", argv[0]);
			exit(1);
		}
	} else {
		input = atof(argv[1]);
	}

	if ( metric >= 1 ) {
		pitch = input;
		tpi = 1.0/input;
	} else {
		tpi = input;
		pitch = 1.0/input;
	}

	/*
	 * calculate the double depth
	 */
	depth = pitch * 0.8660;
	ddepth = depth * 2.0;
	fdepth = ddepth * 0.75;

	/*
	 * print out a reminder of the input data and the calculated output
	 */
	if (metric == 0) {
		printf("\nFor a thread of:\t\t%8.2f TPI\n", tpi);
		printf("\tthe pitch is:\t\t%8.4f\"/thread\n", pitch);
		printf("\tthe sharp V depth is:\t\t%8.4f\"\n", depth);
		printf("\tthe sharp V double depth is:\t%8.4f\"\n", ddepth);
		printf("\tthe formed double depth is:\t%8.4f\"\n\n", fdepth);
	} else {
		printf("\nFor a thread pitch of:\t\t%8.2f mm\n", pitch);
		printf("\tthe sharp V depth is:\t\t%8.2f mm\n", depth);
		printf("\tthe sharp V double depth is:\t%8.2f mm\n", ddepth);
		printf("\tthe formed double depth is:\t%8.4f mm\n\n", fdepth);
	}

	exit(0);

}