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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LEARN ABOUT CENTOS

catanhf

CATANH(3)						     Linux Programmer's Manual							 CATANH(3)

NAME

       catanh, catanhf, catanhl - complex arc tangents hyperbolic

SYNOPSIS

       #include <complex.h>

       double complex catanh(double complex z);
       float complex catanhf(float complex z);
       long double complex catanhl(long double complex z);

       Link with -lm.

DESCRIPTION

       The catanh() function calculates the complex arc hyperbolic tangent of z.  If y = catanh(z), then z = ctanh(y).	The imaginary part of y is
       chosen in the interval [-pi/2,pi/2].

       One has:

	   catanh(z) = 0.5 * (clog(1 + z) - clog(1 - z))

VERSIONS

       These functions first appeared in glibc in version 2.1.

CONFORMING TO

       C99.

EXAMPLE

       /* Link with "-lm" */

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

       int
       main(int argc, char *argv[])
       {
	   double complex z, c, f;

	   if (argc != 3) {
	       fprintf(stderr, "Usage: %s <real> <imag>
", argv[0]);
	       exit(EXIT_FAILURE);
	   }

	   z = atof(argv[1]) + atof(argv[2]) * I;

	   c = catanh(z);
	   printf("catanh() = %6.3f %6.3f*i
", creal(c), cimag(c));

	   f = 0.5 * (clog(1 + z) - clog(1 - z));
	   printf("formula  = %6.3f %6.3f*i
", creal(f2), cimag(f2));

	   exit(EXIT_SUCCESS);
       }

SEE ALSO

       atanh(3), cabs(3), cimag(3), ctanh(3), complex(7)

COLOPHON

       This page is part of release 3.53 of the Linux man-pages project.  A description of the project, and information about reporting bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.

								    2011-09-15								 CATANH(3)