In March 2003, I rewrote my Java anagram generator in the programming language C++ to run on Windows platforms. This was mainly so I could learn about Windows programming. In the process I made a few improvements to it.

The anagram generator can now be obtained from the Microsoft Store.

In 2003, I wrote a Black-Scholes option pricing calculator for Microsoft Windows. Although this equation has been implemented thousands of times before, my motivation here is to provide a standalone Windows user interface to the model. If floating point arithmetic over or underflows the application will report it.

I assume no responsibility for the correctness of this software and it should not be used as a basis for trading decisions.

The formulas used are:
Call option fair price = S0N(d1) - Xe-rtN(d2)
Put option fair price = Xe-rtN(-d2) - S0N(-d1)
where

• X is the exercise price
• S₀ is the price of asset at time 0
• N(x) is the cumulative normal distribution
• r is the riskless rate of interest
• t is the length of time until maturity
• d₁ = ( (ln(S₀/X) + rt)/(sigma * t^½) ) + (½ * sigma * t^½)
• d₂ = d₁ - sigma * t^½
• sigma is the volatility

The main assumptions of this model are:

• The option is European style and so cannot be exercised before maturity.
• The underlying asset pays no dividends before maturity.

The Black-Scholes option pricing calculator can now be obtained from the Microsoft Store.