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 old Java one can still be found here.

Right click on winanagram.zip to download the new native Windows anagram generator.

Right click on blackscholes.zip to download the Black-Scholes option pricing calculator for Microsoft Windows platforms as a compressed ZIP file. 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.