What’s a Variable?

The variables that we use in writing code are the very same variables that we learned about in school. Take the following equation for example:

a2 + b2 = c2

I’m sure you’ve seen this before; it’s the Pythagorean theorem and it’s pretty useful for finding the length of one side of a right-angle triangle if we know any of the other two sides. The letters a, b, and c are the names for numerical data, in this case the letter c is used for the hypotenuse while a and b are the other two sides of the triangle. We can also call these letters variables. Variables are quite simply containers for information. In programming, variables have a name that tells us what data the variable might contain and they have a type that determines ...

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