Most easiest calculator
I used to use SQLPLUS SELECT ... from DUAL as a simple calculator, and later discovered or inconvenient (must be guaranteed to find a start-up database)
Later, it was found that the set of command line prompt under 2000 / XP can make simple calculations.
C: /> SET / A (100 200) / 3100c: />
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how about it? Is it very convenient. The only unfortunately, this calculator can only calculate integer.
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