This description of a variable and assignment is more or less what every programmer ends up understanding in a practical sense. It is important to think of a variable as a name that is bound to an entity. A variable is not the same thing as its value as its value can change.
A variable is a more abstract idea that is best understood as a name that labels or is bound to some storage. If you work with variables you can't help but think about them as named units of storage even if you don't know how the underlying hardware works with them.
4. Basic Declarations and Expressions - Practical C Programming, 3rd Edition [Book]
However, as you carry on learning and programming you slowly start to realise that variables are slightly more complex. These may sound like questions on an exam paper in existential philosophy but an understanding of how variables behave is vital to designing programs that work. The first line is long gone. You can only look at one line at a time, and always sequentially. The word you use to name your variable is only important to you.
So you can write:. If you were to use the variable name xyz , this would not be clear to someone reading the program. The word variable implies that variables can change, and indeed they can. You could write the following program:.
Assignment (computer science)
In memory the variable dog can only be associated with one string. The third line above replaces the old association with the new.
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It might look like this: print "I have a dog. It is called Bort. This operator first subtracts the current value of the variable on left from the value on the right and then assigns the result to the variable on the left. If initially value stored in a is 8.
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This operator first multiplies the current value of the variable on left to the value on the right and then assigns the result to the variable on the left. This operator first divides the current value of the variable on left by the value on the right and then assigns the result to the variable on the left. If initially value stored in a is 6.
Below example illustrates the various Assignment Operators: C.
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