From Wikipedia, the free encyclopedia: A happy number is defined by the following process. Starting with any positive integer, replace the number
Continue ReadingC++: Multiplicative Digital Root
The multiplicative digital root (MDR) and multiplicative persistence (MP) of a number, n, is calculated rather like the Digital root except digits are
Continue ReadingWhy Is Subtracting These Two Times (In 1927) Giving a Strange Result?
If I run the following program, which parses two date strings referencing times one second apart and compares them: public static void main(String[]
Continue ReadingC++: Sample Covariance
double sample_covariance(double A[], double B[], int length) // Function calculates the sample covariance the array A and array B, whose lengths
Continue ReadingC++: Calculate Geometric Mean
void Geometric_Mean_Array(double & mean_normal, const double * a, const int n) //Function that calculates the geometric mean (geometric avera
Continue ReadingC++: Black Scholes Put Option Theta
// Calculate the Black Scholes European put option Theta double BS_Put_Option_Theta(double S, double K, double r, double v, double T) // Parame
Continue ReadingC++: Create a File
In this task, the job is to create a new empty file called "output.txt" of size 0 bytes and an empty directory called "docs". This should be done twic
Continue ReadingC++: Random Number Generator
Rule 30 is considered to be chaotic enough to generate good pseudo-random numbers. As a matter of fact, rule 30 is used by the Mathematica software fo
Continue ReadingC++: Apply a Callback to an Array
In this task, the goal is to take a combined set of elements and apply a function to each element. C-style Array: #include <iostream> //
Continue ReadingC++: Higher-Order Functions
Pass a function as an argument to another function. Function Pointer Works with: g++ version 3.4.2 (mingw-special) C++ can pass function pointers i
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