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Pascal program examples2/20/2024 ![]() When you have declared an enumerated type, you can declare variables of that type. The specific implementation for these concepts and other terms presented, is the language Turbo Pascal (5.5 or later). This paper presents three introductory concepts of object-oriented programming: encapsulation, inheritance and polymorphism. Now, let's see variables of enumerated type, which can be defined as − An introduction to object-oriented programming through Turbo Pascal. You have seen how to use simple variable types like integer, real and boolean. Welcome to the world of Pascal John Smith When the above code is compiled and executed, it produces the following result − Writeln(message, ' ', firstname, ' ', surname) Writeln('Please enter your first name: ') Message = ' Welcome to the world of Pascal ' Let us look at an example, which makes use of various types of variables discussed so far − The initialization is followed by the var keyword and the syntax of initialization is as follows − Variables can be initialized (assigned an initial value) in their declaration. So it is a better practice to initialize variables in a program. The general form of assigning a value is −īy default, variables in Pascal are not initialized with zero. Variables are assigned a value with a colon and the equal sign, followed by a constant expression. This is not so with the type declaration. Most importantly, the variable name refers to the memory location where the value of the variable is going to be stored. You can compare type declaration in Pascal with typedef in C. Type declaration indicates the category or class of the types such as integer, real, etc., whereas the variable specification indicates the type of values a variable may take. Please note the difference between type declaration and var declaration. Now, the types so defined can be used in variable declarations − This type can be used to define variables of that type. A type can be identified by a name or identifier. In the previous tutorial, we have discussed that Pascal allows declaring a type. Some valid variable declarations are shown here − Here, type must be a valid Pascal data type including character, integer, real, boolean, or any user-defined data type, etc., and variable_list may consist of one or more identifier names separated by commas. A declaration specifies a list of variables, followed by a colon (:) and the type. All variable declarations are followed by the var keyword. Variable Declaration in PascalĪll variables must be declared before we use them in Pascal program. For this chapter, let us study only basic variable types. Pascal programming language also allows defining various other types of variables, which we will cover in subsequent chapters like Pointer, Array, Records, Sets, and Files, etc. Represents variables, whose values lie within a range. The most natural size of integer for the machine.
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