04-12-2011
Well, numbers often come from string data, for instance if first argument on the command line, "$1". You can read text in from the keyboard and pattern-test it to ensure it is valid text. Bash and ksh support $(( )), which does all sorts of integer arithmetic, e.g., z=$(( $z + 1 )), and if (( )), which allows all sorts of integer tests, e.g., if (( $z < 30 )). I am not sure they have a friendly floating point, probably. Let me google a bit . . . no, bash does not. I use dc or bc to do my floating point calculations within scripts, or move to a more formal language. The text from bc can be tested to see if it is negative, for instance.
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LEARN ABOUT HPUX
ilogbd64
ilogbd64(3M) ilogbd64(3M)
NAME
ilogbd64(), ilogbd128(), ilogbd32() - decimal exponent functions
SYNOPSIS
DESCRIPTION
The function computes the exponent of the floating point value x. Formally, the return value is the integral part of log base 10 of |x| as
a signed integer value, for nonzero x.
If x is subnormal, it is treated as though it were normalized, before the exponent is determined.
is equivalent to for all values of x
is a version of it takes a argument.
is a version of it takes a argument.
These math functions are supported for HP-UX 11i Version 3 September 2008 Update and forward.
USAGE
To use any of these functions, compile with the option.
Make sure your program defines and then includes
Link in the math library by specifying or on the linking command line.
For more information, see the at the following site:
RETURN VALUE
If x returns and raises the invalid floating-point exception.
If x is zero, returns and raises the invalid floating-point exception.
If x is NaN, returns and raises the invalid floating-point exception.
ERRORS
If x is NaN, sets to
If x is zero or infinite, sets to
SEE ALSO
frexpd64(3M), logbd64(3M), scalbnd64(3M), scalblnd64(3M), math(5).
STANDARDS CONFORMANCE
These functions conform to ISO/IEC TR 24732, "Extension for the programming language C to support decimal floating-point arithmetic".
HP Integrity Server Only ilogbd64(3M)