Electronic calculator having means for directly inputting variables into a prestored and displayed equation

Claim 1

An electronic calculator comprising: first input means for inputting one or more algrebraic equations into said calculator, each of said one or more algebraic equations including an output variable term and at least one input variable term with operating elements; first memory means for storing equations input into said calculator according to said first input means; means for selecting at least one of said algebraic equations stored in said first memory means; second memory means for storing each of said output term and said at least one input variable term of a selected equation; display means for displaying each of said at least one input variable term of said selected equation; means for indicating any one of said at least one input variable term stored in said second memory means being displayed; second input means for inputting numeric data in a one-to-one visual correspondence with the indicated variable term, said input numeric data being simultaneously displayed with a corresponding variable term; third memory means for storing the numeric data input according to said second input means; and means for performing a calculation operation on a selected one of said at least one algebraic equations stored in said first memory means by substituting the numeric data from said second input means for the corresponding input variable terms; said display means further being for displaying a calculation result in a position of the selected equation corresponding to the output variable subsequent to said calculation operation being perform.