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The multiline comments are enclosed within curly brackets and asterisks as {* ... *}. Pascal allows single-line comment enclosed within curly brackets { ... }. {* This is a multi-line comments and it will span multiple lines. *} { This is a single line comment in <strong>pascal</strong> } Case Sensitivity Pascal is a case non-sensitive language, which means you can write your variables, functions and procedure in either case. Like variables A_Variable, a_variable and A_VARIABLE have same meaning in Pascal. Pascal Statements Pascal programs are made of statements. Each statement specifies a definite job of the program. These jobs could be declaration, assignment, reading data, writing data, taking logical decisions, transferring program flow control, etc. For example: readln (a, b, c); s := (a + b + c)/2.0; area := sqrt(s * (s - a)*(s-b)*(s-c)); writeln(area); Reserved Words in Pascal The statements in Pascal are designed with some specific Pascal words, which are called the reserved words. For example, the words, program, input, output, var, real, begin, readline, writeline and end are all reserved words. Following is a list of reserved words available in Pascal. and array begin case const div do downto else end file for function goto if in label mod nil not of or packed procedure program record repeat set then to type until Var while with Character set and Identifiers in Pascal TUTORIALS POINT Simply Easy Learning Page 10
The Pascal character set consists of: All upper case letters (A-Z) All lower case letters (a-z) All digits (0-9) Special symbols - + * / := , . ;. () [] = {} ` white space The entities in a Pascal program like variables and constants, types, functions, procedures and records, etc., have a name or identifier. An identifier is a sequence of letters and digits, beginning with a letter. Special symbols and blanks must not be used in an identifier. TUTORIALS POINT Simply Easy Learning Page 11
Page 1 and 2: Pascal Tutorial
Page 3 and 4: ABOUT THE TUTORIAL Pascal Tutorial
Page 5 and 6: Declaring Constants ...............
Page 7 and 8: Accessing Two-Dimensional Array Ele
Page 9 and 10: CHAPTER 1 Pascal Overview This chap
Page 11 and 12: CHAPTER 2 Environment This section
Page 13 and 14: Name and version of text editor can
Page 15 and 16: Pascal Hello World Example Followin
Page 17: CHAPTER 4 Basic Syntax You have see
Page 21 and 22: Type Declarations: The type declara
Page 23 and 24: Subrange Types Subrange types allow
Page 25 and 26: Pascal programming language also al
Page 27 and 28: Enumerated Variables You have seen
Page 29 and 30: CHAPTER 7 Constants This section sh
Page 31 and 32: CHAPTER 8 Operators This section sh
Page 33 and 34: Checks if the value of left operand
Page 35 and 36: When the above code is compiled and
Page 37 and 38: program beBitwise; var a, b, c: int
Page 39 and 40: CHAPTER 9 Decision Making This sect
Page 41 and 42: Example: Let us try a complete exam
Page 43 and 44: Example: Let us try a complete exam
Page 45 and 46: Nested if-then Statements It is alw
Page 47 and 48: The following rules apply to a case
Page 49 and 50: Flow Diagram: Example: The followin
Page 51 and 52: CHAPTER 10 Loops This section shows
Page 53 and 54: Flow Diagram: Here, key point of th
Page 55 and 56: Flow Diagram Example: program forLo
Page 57 and 58: Example: program repeatUntilLoop; v
Page 59 and 60: When the above code is compiled and
Page 61 and 62: Example: program exBreak; var a: in
Page 63 and 64: Example: program exContinue; var a:
Page 65 and 66: Example: The following program illu
Page 67 and 68: Defining a Function: In Pascal, a f
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When the above code is compiled and
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variable named m. The variable m is
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program exRecursion; var num, f: in
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procedure swap(x, y: integer); var
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Now, let us extend the program litt
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Let us change the previous example
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12 function AnsiStrLower( Str: PCha
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CHAPTER 15 Boolean This section sho
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CHAPTER 16 Arrays This section show
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Initializing Arrays In Pascal, arra
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Two-Dimensional Arrays: The simples
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The following example declares and
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Passing Arrays as Subprogram Argume
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Following are some valid pointer de
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To check for a nil pointer, you can
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program exPointers; const MAX = 3;
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program exPointers; const MAX = 3;
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Value of num = 3000 Value available
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CHAPTER 18 Records This section sho
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(* book 2 specification *) Book2.ti
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type record-ptr = ^ record-name; re
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(* book 1 specification *) Book1.ti
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Example: The following example woul
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Set Operators You can perform the f
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CHAPTER 21 File Handling This secti
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Reads data from a file into memory
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Reads from file into variable and g
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CHAPTER 22 Memory Management This s
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Resizing and Releasing Memory When
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Frees dynamically allocated memory
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Returns segment 37 procedure SetMem
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eadkey; clrscr; gotoxy(20,3); write
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Program DateDemo; uses sysutils; va
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14 function EncodeDate( Year: Word;
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39 function TimeStampToDateTime( co
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Objects This section shows the conc
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type Rectangle = object private len
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egin r1.init(3, 7); writeln('Draw a
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function TableTop.getmaterial(): st
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Classes This section shows the clas
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{$mode objfpc} // directive to be u
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Constructors and Destructors for Pa
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program inheritanceExample; {$MODE
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