Re: [opensuse] Command line calculator?



command line interface for dos or unix/linux???


from Larry


On Friday 29 June 2007 12:58, G T Smith wrote:
Adam Jimerson wrote:
Does anyone know if there is a program for a command
line calculator, and if so what it is called?

bash :-)

try

echo $((5+2))
echo $((7*6))

Or, try these:

% echo $(( 5.5 + 2.2 ))
bash: 5.5 + 2.2: syntax error in expression (error token
is ".5 + 2.2 ")

% echo $(( 010 * 020 ))
128

% echo $(( 080 + 020 ))
bash: 080: value too great for base (error token is "080")

% echo $(( 0xa * 0xa ))
100


at CLI

of course if you want trig and logs you need do a little
work...


It only does integers and has an inflexible way of
treating numeric radixes (e.g., leading zero forces
octal), as shown above.

Dc (RPN) or bc (infix) are the way to go for non-trivial
scripted calculation. They do floating point, arbitrary
precision and have formatted printing. (BASH has this,
too, perhaps even better, being modelled after the C
library printf() function.)


Randall Schulz
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