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Full Discussion: How to restrict Rounding using Printf?
Top Forums UNIX for Dummies Questions & Answers How to restrict Rounding using Printf? Post 302878932 by Corona688 on Monday 9th of December 2013 04:36:39 PM
Old 12-09-2013
Floating point numbers do not have infinite precision. They are a fixed number of bits multiplied by two to a mantissa. If you keep adding zeroes, sooner or later it will run out of space in the base number and have to truncate(not round) and increase the mantissa instead.

If you require calculation with infinite precision, the bc utility does exactly this.
 

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LEARN ABOUT OPENSOLARIS

values

values.h(3HEAD) 						      Headers							   values.h(3HEAD)

NAME

       values.h, values - machine-dependent values

SYNOPSIS

       #include <values.h>

DESCRIPTION

       This file contains a set of manifest constants, conditionally defined for particular processor architectures.

       The  model  assumed  for  integers  is binary representation (one's or two's complement), where the sign is represented by the value of the
       high-order bit.

       BITS(type)		  The number of bits in a specified type (for example, int).

       HIBITS			  The value of a short integer with only the high-order bit set.

       HIBITL			  The value of a long integer with only the high-order bit set.

       HIBITI			  The value of a regular integer with only the high-order bit set.

       MAXSHORT 		  The maximum value of a signed short integer.

       MAXLONG			  The maximum value of a signed long integer.

       MAXINT			  The maximum value of a signed regular integer.

       MAXFLOAT, LN_MAXFLOAT	  The maximum value of a single-precision floating-point number, and its natural logarithm.

       MAXDOUBLE, LN_MAXDOUBLE	  The maximum value of a double-precision floating-point number, and its natural logarithm.

       MINFLOAT, LN_MINFLOAT	  The minimum positive value of a single-precision floating-point number, and its natural logarithm.

       MINDOUBLE, LN_MINDOUBLE	  The minimum positive value of a double-precision floating-point number, and its natural logarithm.

       FSIGNIF			  The number of significant bits in the mantissa of a single-precision floating-point number.

       DSIGNIF			  The number of significant bits in the mantissa of a double-precision floating-point number.

SEE ALSO

       Intro(3) math.h(3HEAD)

SunOS 5.11							    2 Mar 1993							   values.h(3HEAD)
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