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C, C++, and Java programmers will already be familiar with the increment and decrement operators. The increment operator is formed by placing two plus signs after a variable, such as this: var somenumber somenumber++ This line of code increments the value of somenumber by one. Had we written: somenumber-- it would have decreased the value by one. It is very important that you realize that where you place increment and decrement operators is critical. If you place the increment operator after a variable, such as: var somenumber = 10 var someothernumber someothernumber = somenumber++ The assignment operation will take place before the evaluation operation.

Chapter 3 Literals 28 n Chapter 3 Hexadecimal Integers Hexadecimal integers are commonly used in programming environments because each hexadecimal digit represents four binary bits. A hexadecimal number is any sequence of these digits: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F. The integers are called hexadecimal because they are based on 16 different digits. Case sensitivity rules do not apply to numbers, so you can use lowercase letters as well. The prefix for hexadecimal numbers is 0x or 0X.

Write It is important to understand the way external scripts are interpreted, because many different rules apply to JavaScript and HTML layout. Just keep in mind that an external script is actually interpreted as if it precedes the local script (enclosed by the tags). js suffix to the MIME type application/x-javascript, which it sends back in the HTTP header. js filename extension to application/x-javascript, Navigator will not properly load the JavaScript file specified by the SRC attribute.

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