Category Archives: algorithms

Linkback to the Secret Santa Problem

Posted on September 27, 2017 by RodStephens

Tom left a comment to my post Calculate the number of secret Santa permutations in C#. He used that example to build a site in JavaScript explaining how the algorithm works. It’s a pretty cool little page. Drop by and … Continue reading →

Posted in algorithms, combinatorics, mathematics | Tagged algorithms, C#, C# programming, combinatorics, derangements, example, example program, linkback, mathematics, permutations, secret Santa, secret Santa permutations, selections, Windows Forms programming | Leave a comment

Make a dice-rolling simulation in C#

Posted on September 21, 2017 by Rod Stephens

This example performs a simulation of rolling two six-sided dice. It’s related to my book Interview Puzzles Dissected, which includes several examples that involve rolling dice. When you enter a number of trials and click Roll, the program uses the … Continue reading →

Posted in algorithms, graphics, mathematics | Tagged algorithms, C#, C# programming, dice rolls, die rolls, example, example program, graphics, mathematics, probability, simulation, statistics, Windows Forms programming | Leave a comment

Draw the Weierstrass function in C#

Posted on September 11, 2017 by RodStephens

The Weierstrass function was discovered by Karl Weierstrass in 1872. It’s an odd function that is continuous everywhere but differentiable nowhere. I’ll explain what that means shortly. Here’s the function: Here: The following two sections explain what it means to … Continue reading →

Posted in algorithms, drawing, fractals, graphics, mathematics | Tagged algorithms, C#, C# programming, continuous function, differentiable function, discontinuous function, drawing, example, example program, fractals, graphics, mathematics, non-differentiable function, Weierstrass curve, Weierstrass function, Windows Forms programming | Leave a comment

Calculate Fibonacci numbers in several ways in C#

Posted on September 8, 2017 by Rod Stephens

For some background on Fibonacci numbers and φ, see Examine the relationship between the Fibonacci sequence and phi in C#. This example shows several ways to calculate Fibonacci numbers. While this is mostly for curiosity’s sake, this example does demonstrate … Continue reading →

Posted in algorithms, mathematics | Tagged Abraham de Moivre, algorithms, C#, C# programming, de Moivre, example, example program, Fibonacci numbers, mathematics, phi, Windows Forms programming | Leave a comment

Recursively draw equations in C#

Posted on September 7, 2017 by Rod Stephens

The basic idea for recursively drawing equations is simple. Well, sort of simple. Classes represent different kinds of equations. A particular class knows how to draw its kind of equation. It uses other classes to draw its pieces. For example, … Continue reading →

Posted in algorithms, drawing, fonts, graphics, recursion | Tagged algorithms, C#, C# programming, draw equations, drawing, equations, example, example program, fonts, graphics, recursion, Windows Forms programming | 2 Comments

Book Errata Page: The C# Helper Top 100

Posted on September 4, 2017 by RodStephens

This is the errata page for my book The C# Helper Top 100, The 100 most popular posts at csharphelper.com. If you find mistakes, please post them here in the Leave a Reply box at the bottom of the page. … Continue reading →

Posted in .NET, algorithms, books, C#, C# programming | Tagged .NET, algorithms, animation, API, books, C#, C# Helper, C# programming, classes, clipboard, combinatorics, cryptography, curve fitting, dialogs, drag and drop, drawing, events, example, example program, Excel, files, fractals, FTP, graphics, image processing, interop, interoperability, mathematics, multimedia, Office, printing, Rod Stephens, serialization, system, threading, tips, tools, Windows Forms programming | 2 Comments

Book Discussion Page: The C# Helper Top 100

Posted on September 4, 2017 by RodStephens

This is a discussion page for my book The C# Helper Top 100, The 100 most popular posts at csharphelper.com. Please post questions, thoughts, and suggestions here in the “Leave a Reply” box at the bottom of the page. I … Continue reading →

Table of Contents: The C# Helper Top 100

Posted on September 4, 2017 by RodStephens

This is a brief summary of the book’s table of contents. Introduction Part I. Serialization 1. Read a CSV File into an Array (1) 2. Use JSON to Serialize and Deserialize Objects (49) Part II. Graphing 3. Draw a Graph … Continue reading →

New Book: The C# Helper Top 100

Posted on September 4, 2017 by RodStephens

I’m happy to announce my latest book, The C# Helper Top 100, The 100 most popular posts at csharphelper.com. It describes the 100 most popular posts on the C# Helper web site. This is my 32nd book and my second … Continue reading →

Posted in .NET, algorithms, books, C#, C# programming | Tagged .NET, algorithms, animation, API, books, C#, C# Helper, C# programming, classes, clipboard, combinatorics, cryptography, curve fitting, dialogs, drag and drop, drawing, events, example, example program, Excel, files, fractals, FTP, graphics, image processing, interop, interoperability, mathematics, multimedia, Office, printing, Rod Stephens, serialization, system, The C# Helper Top 100, threading, tips, tools, Windows Forms programming | Leave a comment

Find random prime numbers in C#

Posted on August 29, 2017 by Rod Stephens

The example Probabilistically determine whether a number is prime in C# explains an algorithm for determining whether a number is prime with any desired level of certainty. After you add that method to your algorithmic toolkit, finding large prime numbers … Continue reading →