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Pascal Programming Introduction You have seen a basic structure of pascal program, so it will be easy to understand other basic building blocks of the pascal programming language. Variables A variable definition is put in a block beginning with a var keyword, followed by definitions of the variables as follows: var A_Variable , B_Variable ... : Variable_Type ; Pascal variables are declared outside the code-body of the function which means they are not declared within the begin and end pairs, but they are declared after the definition of the procedure/function and before the begin keyword. For global variables, they are defined after the program header. Functions/Procedures In Pascal, a procedure is set of instructions to be executed, with no return value and a function is a procedure with a return value. The definition of function/procedures will be as follows - Function Func_Name ( params ...) : Return_Value ; Procedure Proc_Name ( params ...); Comments 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 pascal } 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 ); References http://www.tutorialspoint.com/pascal/pascal_basic_syntax.htm

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Pascal Programming Introduction

You have seen a basic structure of pascal program, so it will be easy to understand other basic building blocks of the pascal programming language.

Variables

A variable definition is put in a block beginning with a var keyword, followed by definitions of the variables as follows:

var A_Variable , B_Variable ... : Variable_Type ;

Pascal variables are declared outside the code-body of the function which means they are not declared within the begin and end pairs, but they are declared after the definition of the procedure/function and before the begin keyword. For global variables, they are defined after the program header.

Functions/Procedures

In Pascal, a procedure is set of instructions to be executed, with no return value and a function is a procedure with a return value. The definition of function/procedures will be as follows -

Function Func_Name ( params ...) : Return_Value ; Procedure Proc_Name ( params ...);

Comments

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 pascal }

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 );

References

http://www.tutorialspoint.com/pascal/pascal_basic_syntax.htm