Is a calculator a computer

A basic calculator that can only add, subtract, multiply and divide is not a computer. To be a computer a machine has to be programmable with a programming language.

An advanced scientific calculator that is capable of holding large amounts of information in memory, calculating Sin/Cos/Tan values etc, is a computer, as it uses internal programming to calculate these much more difficult equations.

Additional info

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The term "computer" originated before electronic computers ever existed. The name was given to people who would be given very difficult mathematical equations to "compute" the answers to. When machines took over the job the name "computer" stuck.