Casio fx-4200P
Datasheet legend
Ab/c:
Fractions calculation
AC: Alternating current BaseN: Number base calculations Card: Magnetic card storage Cmem: Continuous memory Cond: Conditional execution Const: Scientific constants Cplx: Complex number arithmetic DC: Direct current Eqlib: Equation library Exp: Exponential/logarithmic functions Fin: Financial functions Grph: Graphing capability Hyp: Hyperbolic functions Ind: Indirect addressing Intg: Numerical integration Jump: Unconditional jump (GOTO) Lbl: Program labels LCD: Liquid Crystal Display LED: Light-Emitting Diode Li-ion: Lithium-ion rechargeable battery Lreg: Linear regression (2-variable statistics) mA: Milliamperes of current Mtrx: Matrix support NiCd: Nickel-Cadmium rechargeable battery NiMH: Nickel-metal-hydrite rechargeable battery Prnt: Printer RTC: Real-time clock Sdev: Standard deviation (1-variable statistics) Solv: Equation solver Subr: Subroutine call capability Symb: Symbolic computing Tape: Magnetic tape storage Trig: Trigonometric functions Units: Unit conversions VAC: Volts AC VDC: Volts DC |
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Casio fx-4200P
A very interesting Casio calculator that has "memo storage" for text, data, or formulae (qualifying the calculator as a programmable model.) Although it has a fair bit of storage (279 steps) individual formulae can only be up to 63 steps long, there are no conditional or branching instructions, and one formula cannot refer to another as a subprogram. This limits the calculator's capabilities, making it yet another beast on which a sophisticated problem, like my favorite programming example, calculating the value of the Gamma function, cannot be solved with a simple program.
That said, Stirling's formula fits easily into the calculator's memory. The version I am presenting here operates on the most recent calculation result; this method avoids prompting by the calculator for the value of any variables that occur in the formula:
(Ans+1)xyAnse(-Ans-1)×√(2π(Ans+1))(1+1÷12÷(Ans+1))