After the programming is complete, the macro will run in computation mode to save the user steps and improve accuracy. Basically, the keys one would press in the calculating mode to arrive at a solution are entered in the programming mode along with logical operators ( if, and, etc.) applicable to the solution. The HP-12C's programming mode is very intuitive and works like a macro operation on a computer.
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Later HP financial calculators are many times as fast with more functions, but none has been as successful. The 1977 October edition of the HP Journal contains an article by Roy Martin, the inventor of the simple method of operation used in HP financial calculators, which describes, in detail, the mathematics and functionality built by Prof William Kahan (from UC Berkeley) and Roy Martin that is still in use today. Its popularity has endured despite the fact that even a simple, but iterative, process such as amortizing the interest over the life of a loan-a calculation which modern spreadsheets can complete almost instantly-can take over a minute with the HP-12C. Due to its simple operation for key financial calculations, the calculator long ago became the de facto standard among financial professionals – for example, most investment banks issue HP-12Cs to the members of each incoming class of its investment banking analysts and associates. The HP-12C is HP's longest and best-selling product, in continual production since its introduction in 1981.