Programming Challenges - A List Post: 302122630

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Top Forums Programming Programming Challenges - A List Post 302122630 by Octal on Wednesday 20th of June 2007 11:10:21 PM

06-21-2007

Registered User

Challenge: Write your own square root function.

Difficulty: Easy

My Implementation:

Code:

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

float root(float);

main(int argc, char *argv[]) {
        if (argc < 2) {
                fprintf(stderr, "usage: %s [number]", argv[0]);
                exit(0);
        }

        while (*++argv) {
                printf("%f\n", root(atof(*argv)));
        }
}
float root(float o) {
        float r = 0.5*(o/2);

        while ((r*r) != o) {
                r = 0.5*(o/r+r);
        }
        return r;
}

Try entering a number like 10. It doesn't exactly work. So I made a new program:

Code:

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

float root(float);

main(int argc, char *argv[]) {
	if (argc < 2) {
		fprintf(stderr, "usage: %s [number]", argv[0]);
		exit(0);
	}

	while (*++argv) {
		printf("%.2f\n", root(atof(*argv)));
	}
}
float root(float o) {
	float r = 0.5*(o/2);
	int i = 0;

	while ((r+1)*(r+1) <= o) {
		r++;
	}
	while (i < 4) {
		r = 0.5*(r+o/r);
		i++;
	}

	return r;
}

Octal

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obd2kml

obd2kml(1)						      General Commands Manual							obd2kml(1)

NAME

       obd2kml - Convert obdgpslogger(1) logs to Google Earth kml files

SYNOPSIS

       obd2kml [ options ]

DESCRIPTION

       Convert obdgpslogger(1) logs to Google Earth kml files

OPTIONS

       -o|--out <output filename>
	      Output to this .kml file

       -a|--altitude <altitude>
	      In the kml file, normalise the graph to this height

       -d|--db <database>
	      Work from logs stored in this database file

       -n|--name <folder name>
	      Everything in this output file is wrapped in a folder named this

       -v|--version
	      Print out version number and exit.

       -h|--help
	      Print out help and exit.

NOT OPTIONS

       These options aren't intended for end-users, they're for the GUI.

       -p|--progress
	      Print out progress. It will occasionally print a number in the range [0..100], indicating progress percentage.

SEE ALSO

       obdgpslogger(1), obd2csv(1), obd2gpx(1), obdsim(1), obdgui(1), obdlogrepair(1)

AUTHORS

       Gary "Chunky Ks" Briggs <chunky@icculus.org>

																	obd2kml(1)