# Beginner Programming Tips

Reference > Science > TechnologyToggling a variable between two values in a computer program; switching a bit from zero to one and back.

Random number generators -- creating and understanding how they work, with Basic example using Rnd function and int function.

Does an equation have a value? Yes, you can find the values of equations - True or False, in Boolean terms.

Counting truth values -- how many equations in a list are true or false? Counting up the true statements.

Testing for zero -- three methods to determine if one or more computer variables is equal to zero.

Walk through an array -- convert a two-dimensional index to a one-dimensional index. Use a function for reusable code.

Walk through an array -- convert a one-dimensional index to a two-dimensional index, using integer division and modulus math.

Removing Array Elements -- how to remove an element from an array, using basic programming techniques.

Parsing a string containing a comma-separated list of values to extract the values and perform some action with those values.

Given a number of seconds, convert that into minutes or hours. Uses the Mod function, Integer division, and the Format function.

A function to make words either plural or singular, depending on whether an integer variable is one or not.

Every time you select a section of code to copy and paste, ask yourself, 'Should this be a function?'

Randomizing an array: how to you scramble the order of elements in an array?

Randomizing an array by randomizing a second array containing indices into the first array.

Use the random function to generate random passwords.

How to validate an e-mail address entered by a site visitor. Does the e-mail address have the proper format?

# Understanding Coronavirus Spread

A Question and Answer session with Professor Puzzler about the math behind infection spread.

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