A variable is used purely for the purpose of storing a single value. Being variable, the value can be changed at any time. A constant is the opposite of a variable; its value cannot be changed.
In programming, the best way to establish two-way communication between modules is to use global variables. These variables will apply throughout the program. Just make sure to declare them before establishing the main module.
to quantify the qualitative variables.
Constant Variables
McCormick use combination of political,social and economic variables
They use them to solve an equation they don't know.Accountants use variables to give a visualization to their customers as to how they are doing the accounting
The question is to vague. There are way too many variables in design and construction to give an accurate answer. Variables such as use, size, location, materials, local conditions all contribute to the cost.
we use variable to store the value
No. You can use Javascript for client side calculations
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Variables.
They are designed to work that way - and it's actually quite useful to have variables that work that way. If you want to keep a value from one method call to the next, you have to use some other way to store the information. For example, you can store information in an object field.
Environment variables are a set of dynamic values that can affect the way running processes will behave on a computer.