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Full Discussion: PERL - rounding fractional number
Top Forums Shell Programming and Scripting PERL - rounding fractional number Post 302473179 by ganapati on Friday 19th of November 2010 05:56:42 AM
Old 11-19-2010
Lightbulb PERL - rounding fractional number
It seems that perl sprintf uses the round-to-even method:
PHP Code:
foreach my $i ( 0.5, 1.5, 2.5, 3.5 ) {
    printf "$i -> %.0f\n", $i;
}
__END__

0.5 -> 0
1.5 -> 2
2.5 -> 2
3.5 -> 4
4.5 -> 4 
Where we probably wants to use round-half-up, i.e. output should be as below:

PHP Code:
0.5 -> 1
1.5 -> 2
2.5 -> 3
3.5 -> 4
4.5 -> 5 
Any suggestion to correct the above code to accomplish the above required result?
 

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LEARN ABOUT SUNOS

round

round(3M)						  Mathematical Library Functions						 round(3M)

NAME

       round, roundf, roundl - round to nearest integer value in floating-point format

SYNOPSIS

       cc [ flag... ] file... -lm [ library... ]
       #include <math.h>

       double round(double x);

       float roundf(float x);

       long double roundl(long double x);

DESCRIPTION

       These  functions round their argument to the nearest integer value in floating-point format, rounding halfway cases away from 0, regardless
       of the current rounding direction.

RETURN VALUES

       Upon successful completion, these functions return the rounded integer value.

       If x is NaN, a NaN is returned.

       If x is +-0 or +- Inf, x is returned.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       feclearexcept(3M), fetestexcept(3M), math.h(3HEAD), attributes(5), standards(5)

SunOS 5.10							    1 Nov 2003								 round(3M)
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