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Extra resources for Turbo Pascal® version 6.0 user's guide

Sample text

If you're unfamiliar with editing commands, Chapter 8 discusses all those available. Analyzing your first program While you can type in and run this program without ever knowing how it works, we've provided a brief explanation here. The first line you entered gives the program the name MyFirst. This is an optional statement, but it's a good practice to include it. The next three lines declare some variables, with the word var signaling the start of variable declarations. A and B are declared to be of type Integer; that is, they can contain whole numbers, such as 52,--421, 0, 32,283, and so on.

Subroutines These are separately named sets of irtstructions that can be executed anywhere in the program just by referencing the name. N ow we'll take a look at how to use these elements in Turbo Pascal. Data types When you write a program, you're working with information that generally falls into one of five basic types: integers, real numbers, characters and strings, Boolean, and pointers. Integers are the whole numbers you learned to count with (1, 5, -21, and 752, for example). 579x1024). These are also sometimes known as floating-point numbers.

Z, A ... Z, or _). The rest of an identifier can consist of letters, underscores, and/or digits (0 ... 9); no other characters are allowed. Chapter 2, Programming in Turbo Pascal 37 • Identifiers are case-insensitive, which means that lowercase letters (a .. z) are considered the same as uppercase letters (A .. Z). For example, the identifiers indx, Indx, and INDX are identical. • Identifiers can be of any length, but only the first 63 characters are significant. Operators Once you get your data into the program (and into your variables), you'll probably want to manipulate it somehow, using the operators available to you.

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