Variables are "containers" for storing information.
Do You Remember Algebra From School?
Do you remember algebra from school? x=5, y=6, z=x+y
Do you remember that a letter (like x) could be used to hold a value (like
5), and that you could use the information above to calculate the value of z to be
These letters are called variables, and variables can be used to hold values
(x=5) or expressions (z=x+y).
A variable can have a short name, like x, or a more descriptive name,
- Variable names are case sensitive (y and Y are two different
- Variable names must begin with a letter or the underscore character
variable's value can change during the execution of a script. You can refer to a variable by
its name to display or change its value.
This example will
show you how
After the declaration shown above, the variables are empty (they have no values
However, you can also assign values to the variables when you declare them:
After the execution of the statements above, the variable x will hold
the value 5, and carname will hold the value Volvo.
Note: When you assign a text value to a variable, use quotes
around the value.
If you assign values to variables that have not yet been declared,
the variables will automatically be declared.
have the same effect as:
After the execution of the statements above, the variable x will still have
the value of 5. The value of x is not reset (or cleared) when you redeclare it.
You will learn more about the operators that can be used in the next chapter of this tutorial.
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