Pocket calculator

摘要

Pocket calculator, that is an electronic calculator which is built of integrated circuits and microprocessors, with a display, an input keyboard and a mains-independent battery or accumulator power supply, with a memory to store operands and operators which have been entered via the keyboard even beyond the execution of the current calculation. The entered operands and operators can be called from the memory into the display one after another via the keyboard. Preferably, operands and/or operators which have been called into the display can be corrected, and then the whole calculation is executed again with the possibly corrected operands and/or operators.