08-21-2015
Fellas, fellas, settle down... ;oD
I seem to have created a riot on this thread; now let me mediate.
Firstly I did quote using "INTEGER arithmetic".
Secondly I also quoted "it is a little tongue-in-cheek".
And thirdly it uses builtins only...
At Don...
Don, in his defence, used builtins although not INTEGER arithmetic; he admitted that ksh93 was used as he expended on my original upload using ksh's floating point - root=$((int(number ** .5))) ; I am assuming 'int' is part of ksh's arithmetic...
So Don, as bash cannot do floating point then you did cheat... ;oD
At neutronscott...
Well what can I say... ;oD
Using various [?]awk commands are not builtins so you also cheated... ;oD
At sea...
It would have been interesting to see your result too...
One very serious question however:-
How accurate is either "[?]awk's" or "ksh's" floating point?
Would there be a situation where there would be a false result due to a floating point __error__?
Bazza...
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signbit(3M) signbit(3M)
NAME
signbit() - floating-point sign-determination
SYNOPSIS
floating-type
DESCRIPTION
The macro determines whether the sign of its argument value (which may be a floating-point number, zero, infinity, or NaN) is negative.
The argument must be of floating type. For HP Integrity servers, the argument can be any floating type. For PA-RISC, the argument must be
either or
USAGE
To use the macro, compile either with the default option or with the and options. Make sure your program includes Link in the math library
by specifying on the compiler or linker command line.
RETURN VALUE
The macro returns a nonzero value if and only if the sign of its argument value is negative.
The macro raises no exceptions.
ERRORS
No errors are defined.
EXAMPLES
Take certain actions if is negative zero:
SEE ALSO
fpclassify(3M), isfinite(3M), isinf(3M), isnan(3M), isnormal(3M), math(5).
STANDARDS CONFORMANCE
: ISO/IEC C99 (including Annex F, ``IEC 60559 floating-point arithmetic'')
signbit(3M)