Category Archives: algorithms

Linkback to the Secret Santa Problem

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

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Make a dice-rolling simulation in C#

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

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Draw the Weierstrass function in C#

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

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Calculate Fibonacci numbers in several ways in C#

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

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Recursively draw equations in C#

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

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Book Errata Page: The C# Helper Top 100

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

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Book Discussion Page: The C# Helper Top 100

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

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Table of Contents: The C# Helper Top 100

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

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New Book: The C# Helper Top 100

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

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Find random prime numbers in C#

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

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