INTRODUCTION (c) Africa Studio/Shutterstock.com Electronic, electromechanical electronic devices which can perform math-related calculations automatically are called calculators. Calculators perform the standard arithmetic functions--addition, subtraction, multiplicationand division. They are also capable of performing more complex calculations, such as corrente and inverse trigonometric function ( see trigonometry). The few innovations of the past decade have had as profound an influence on the daily routine such as the handheld, or pocket electronic calculator . These calculators are used to save time as well as to decrease the chance of making mistakes and are found wherever people deal frequently with numbers--in banks, offices, shops and schools, labs, and homes. The early calculators were mechanical. they made calculations using components of machines, such as disks, gears, and drums. These were powered by hand or later by electricity. Around the middl...
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