Most programming languages support global variables, but they tend to do it in different ways. For example, PHP uses the global keyword to access a variable declared outside any function: ...

JavaScript variables hold a wide variety of information and can be used with virtually any data type. Here's how to use variables to store numbers, text strings, objects, and more.

This paper presents a realistic chemical-process optimization problem in detail, and notes the fact of its equivalence to the general nonlinear programming problem. The eight equality constraints that ...