Calculator is the name of the Spreadsheet program used in Official work. An electronic hardware device with master Program which capable of performing mathematical calculations such as addition, multiplication, subtraction, or division. A Calculator have a micro chip with set of program which calculates the input values and print output on calculator screen.  A Calculator is a device that performs arithmetic operations on numbers. The simplest 
Calculator can do only addition, subtraction, multiplication, and division. More sophisticated Calculator can handle exponential operations, roots, logarithm s, trigonometric functions, and hyperbolic functions. Internally, some
Calculator actually perform all of these functions by repeated processes of addition.