Real numbers are stored in the form of a mantissa and exponent.
Float in glibc uses 6 decimal digits as the precision of the mantissa.
Check out "/usr/lib/gcc-lib/i386-redhat-linux/3.0.2/include/float.h"
---------------------------
/* Number of decimal digits of precision in a float */
#undef FLT_DIG
#define FLT_DIG 6
---------------------------
This explains your second output. However, I am at a loss at the first output.
While I cant explain that, the fact that the difference is near a power of
2 suggests that it has got something similar to do with the storage of the
mantissa again.
- Sandip
On Wed, Jan 30, 2002 at 01:23:41AM -0500, Vertical rains spoke out thus:
> hello everyone
>
> i have the following program
>
> ///////////////////////////////////
>
> #include <stdio.h
> #include <iostream.h
> void main ()
> {
> float x = 1073741855;
>
> printf ("%f\n", x);
> cout << x;
> }
>
> //////////////////////////////////
>
> and the out put on running is as follows
>
> 1073741824.000000
> 1.07374e+09
>
> What i want to know is that why am i not
> getting the o/p as 1073741855 .There is a
> difference
> of 31.What am i doing wrong?
> ====for those who posted
> suggestions====
> I would not like to change the data type
> to something else as the float can
> definitely hold this value
> And i also did try declaring the value of
> x as float x=1073741855.0; instead of float
> x=1073741855;
> Used the <iostream.h> and <stdio.h>
> mutually exclusively so that they do not
> clash with each other
>
> It does'nt help and the o/p is still the
> same.
>
> So somebody please HELLLLLLLLLLPPPPPPPPP
>
> Thanks everybody.
> Regards
> Virindera
>
>
>
> --
>
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--
Sandip Bhattacharya
sandipb @ bigfoot.com
http://www.sandipb.net
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