floating point problem Post: 302109575

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Top Forums Programming floating point problem Post 302109575 by vijlak on Tuesday 6th of March 2007 10:00:43 PM

03-06-2007

Registered User

floating point problem

Hi all!
Hi all!
I am working with a problem to find the smallest floating point number that can be represented.
I am going in a loop ,stating with an initial value of 1.0 and then diving it by 10 each time thru the loop.
So the first time I am getting o.1 which I wanted.But from the next iteration I am getting 0.0099998.But this is not I want.
I want a result like this.First time I am 0.1.
Then next iteration should give me 0.01.
Next iteration should give me 0.001 and so on.
I don't know how to achieve this ..I am posting a piece of code here for u to look.
Please suggest.Thanks in advance.

Code:

for(;;)
{
        i=i*10;
        
        small=(1.0)/i; /*here I am getting 0.0099998 on the second iteration.      I need 0.01 on 2nd iteration 
      and 3rd iteration should be 0.001etc.*/
        
        ip=(int*)&small;
        sprintf(sztemp,"%08x",*ip);
        
         if(strcmp(sztemp,szSmall)==0) break;
        
}

Last edited by Perderabo; 03-07-2007 at 03:46 AM.. Reason: Add code tags and disable smilies for readability

vijlak

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LEARN ABOUT MOJAVE

isunordered

ISGREATER(3)						   BSD Library Functions Manual 					      ISGREATER(3)

NAME

     isgreater, isgreaterequal, isless, islessequal, islessgreater, isunordered -- compare two floating-point numbers

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <math.h>

     int
     isgreater(real-floating x, real-floating y);

     int
     isgreaterequal(real-floating x, real-floating y);

     int
     isless(real-floating x, real-floating y);

     int
     islessequal(real-floating x, real-floating y);

     int
     islessgreater(real-floating x, real-floating y);

     int
     isunordered(real-floating x, real-floating y);

DESCRIPTION

     Each of the macros isgreater(), isgreaterequal(), isless(), islessequal(), and islessgreater() takes arguments x and y and returns a non-zero
     value if and only if its nominal relation on x and y is true.  These macros always return zero if either argument is not a number (NaN), but
     unlike the corresponding C operators, they never raise a floating point exception.

     The isunordered() macro takes arguments x and y, returning non-zero if either x or y is NaN.  For any pair of floating-point values, one of
     the relationships (less, greater, equal, unordered) holds.

SEE ALSO

     fpclassify(3), math(3), signbit(3)

STANDARDS

     The isgreater(), isgreaterequal(), isless(), islessequal(), islessgreater(), and isunordered() macros conform to ISO/IEC 9899:1999
     (``ISO C99'').

BSD
								 December 1, 2008							       BSD

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