Both Don and Juan and are given a task on which they must work together to complete in a timely fashion. It takes Don 75 minutes to do the job by himself. It takes Juan 60 minutes to do the job by himself. At their speed, how long would it Read more…
Recently, I have been interested in creating a quick one-way encryption method. After playing around with a lot of different variations, I settled on the following: One nice thing about this function is the fact that you can restrict the encrypted message to a certain length. Another interesting thing is Read more…
Did you know that the bitwise operators always return 32-bit (signed) integers? If you don’t believe me, test out the following examples for yourself:
Recently, I had to create a PostgreSQL equivalent of the Java hashCode() function. In order to do this, I needed a way to make sure that numbers that exceed the INTEGER representation (ranging from -2^31 to 2^31-1) will be wrapped. In JavaScript, this is as simple as using the logical Read more…
One of the things that I have noticed about bitwise operations in JavaScript is that it can be convenient for smaller values, but doesn’t always work for larger values. The reason this is the case is because bitwise operators will only work fully for operands which can be fully expressed Read more…
Click here to see the original POW. The following is how you could get everyone across in 17 minutes: Person A (1 minute) and person B (2 minutes) go across to the target side with the flashlight in 2 minutes. Person B (2 minute) comes back across the bridge with Read more…
This is the first of a new series of posts called the “Problem of the Week” (POW). As is evidenced by the title, these problems will be posted weekly. Every Sunday, I will post the answer to the previous week’s POW. Problem You are a member on a team of Read more…
On Wednesday I explained how to determine if a number is divisible by 3, 6, and/or 9. I also posted a comment with a link to rules for 2, 3, 4, 5, 6, 7, 8, 9, and 10. Therefore, I think it is time for 11 and 12. Divisibility Rule Read more…
When people say that being able to do simple math is what counts the most, they may not be far off. Did you know that as long as you can add, you can look at any number and tell whether or not the number is evenly divisible by three and/or Read more…
Learn how to take the cube root, 4th root, 5th root, etc. of numbers in JavaScript.