Your first line of defense in the world of the Internet is your HTML page. You can use controls that assist the user not only in entering information but also in entering it in the correct format. For example, you can use HTML elements like list boxes and radio buttons to provide the user with a limited range of options to choose from.
Variables, Operators, and Constants
Do you remember how your teachers introduced you to the concept of arithmetic in elementary class? If not, let me refresh your memory a little. Your teacher might have given you a simple example of a basket containing six tomatoes. She might have asked you to put a few more tomatoes in the basket.
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