Need some advices how to increse accuracy of the algorithm
Hi guys
Can you raccomand some what I can do to increse accuracy of the Newton-Raphons method. It's not very accurate.
Code:
// Implementation of Newton - Raphson method for
// determination square root od positive number
// Date: 10. april 2011
// Author: Solaris_user
// Solution for programming exercise 13
#include <stdio.h>
int main(void) {
double tolerance, input, y, x = 1.0;
// Ask user to enter some number to find square root
// if user enters negative number then re-ask for new input
// input must be greater then numbers zero and one.
// also user must enter some tolerance which will controll loop
// test condition
printf("Newton - Raphson square root algorithm\n");
do {
printf("Enter some number to find squre root: ");
scanf("%lf", &input);
if (input <= 1) {
printf("Can't find square root for input number\n");
}
} while (input < 1);
do {
printf("Enter desired tolerance ( < 0.01): ");
scanf("%lf", &tolerance);
if (tolerance >= 0.01) {
printf("Too small tolerance\n");
}
} while (tolerance >= 0.01);
// Newton - Raphson method:
// start with x = 1.0. Then set y = (x + input/2) / 2 . If x and y are not
// close enough then set x = y, stop when difference is small enough
// to be negligible.
do {
y = (x + (input / 2) ) / 2;
if (x > y ) {
x = y;
}
} while ( (x - y) > tolerance);
printf("Square root is %.7lf\n", y);
return 0;
}
This is my output
Code:
Solaris:~/Desktop> ./a.out
Newton - Raphson square root algorithm
Enter some number to find squre root: 9
Enter desired tolerance ( < 0.01): 0.00000001
Square root is 2.7500000
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LEARN ABOUT CENTOS
paps
PAPS(1) General Commands Manual PAPS(1)NAME
paps - UTF-8 to PostScript converter using Pango
SYNOPSIS
paps [options] files...
DESCRIPTION
paps reads a UTF-8 encoded file and generates a PostScript language rendering of the file. The rendering is done by creating outline curves
through the pango ft2 backend.
OPTIONS
These programs follow the usual GNU command line syntax, with long options starting with two dashes (`-'). A summary of options is
included below.
--landscape
Landscape output. Default is portrait.
--columns=cl
Number of columns output. Default is 1.
--font=desc
Set the font description. Default is Monospace 12.
--rtl Do rtl layout.
--paper ps
Choose paper size. Known paper sizes are legal, letter, a4. Default is A4.
--bottom-margin=bm
Set bottom margin in postscript points (1/72 inch). Default is 36.
--top-margin=tm
Set top margin. Default is 36.
--left-margin=lm
Set left margin. Default is 36.
--right-margin=rm
Set right margin. Default is 36.
--help Show summary of options.
--header
Draw page header for each page.
--markup
Interpret the text as pango markup.
--encoding=ENCODING
Assume the documentation encoding is ENCODING.
--lpi Set the lines per inch. This determines the line spacing.
--cpi Set the characters per inch. This is an alternative method of specifying the font size.
--stretch-chars
Indicates that characters should be stretched in the y-direction to fill up their vertical space. This is similar to the texttops
behaviour.
AUTHOR
paps was written by Dov Grobgeld <dov.grobgeld@gmail.com>.
This manual page was written by Lior Kaplan <kaplan@debian.org>, for the Debian project (but may be used by others).
April 17, 2006 PAPS(1)
04-10-2011
