HP 18C calculator is a two keypad calculator that faces each other. The dedicated alphabetic keyboard of this pocket calculator allows you to enter the input conveniently. The multi-line display of this clamshell calculator displays all the levels of the calculation. The high-resolution dot-matrix display of HP 18C calculator allows easier and clear viewing of the figures. The date-time-alarm and the clock with appointments in the pocket calculator make it like a personal organizer. Solve arbitrary equations like a root finder easily with this clamshell calculator that employs both algebraic manipulation and iterative numerical approach. The menu option and the soft keys further ease the operation of HP 18C calculator.