Hello!
Can somebody explain the exact difference between the word calculator
and computer?
IIRC they originated from the same purpose: Have a machine that does
mathematical tasks.
When "computer" was an occupation, performed by humans on paper, it
was very much about performing arithmetic, the function of today's
calculators. However, after the war, "computer" rapidly became a
piece of business equipment, used for tasks that were not, or not
primarily, arithmetical -- like keeping track of inventory, issuing
payrolls, generating statements of account, and so on. While the role
of "scientific computers", performing calculations, was still
important, it was the text-manipulating "business computer" that took
over the primary meaning of "computer".
In countries with a British-derived currency, early business computers
had direct hardware support for monetary calculations in pounds,
shillings, and pence. In countries with decimal currencies, business
computers used a decimal representation for numbers -- their memories
were often specified as so-and-so-many *digits*. Scientific computers
used a binary representation.
The modern calculator evolved from a *different* piece of business
equipment, the adding machine. Originally these were used to sum long
columns of numbers, such as adding up a day's sales to record in a
paper accounting ledger. Electromechanical adding machines were
suppanted by all-electronic four-function desk calculators before
miniaturization made the electronic pocket calculator practical. Many
scientific and engineering computations in this era were still done on
slide rules, or on handheld mechanical devices like the Curta.
Eventually, these electronic calculators became more sophisticated and
the market again bifurcated into "scientific" and "business" models
based on what sorts of functions were built in. (Scientific
calculators can calculate hyperbolic trig functions and their
inverses; business calculators have shortcuts for time-value-of-money
computations and may do internal computations in decimal to avoid
rounding errors inherent in a binary representation.)
[Disclaimer: I wasn't there. Some of the other regulars in this group
were and might know better.]
-GAWollman
--
Garrett A. Wollman | "Act to avoid constraining the future; if you can,
***@bimajority.org| act to remove constraint from the future. This is
Opinions not shared by| a thing you can do, are able to do, to do together."
my employers. | - Graydon Saunders, _A Succession of Bad Days_ (2015)