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96 lines
2.6 KiB
Markdown
96 lines
2.6 KiB
Markdown
---
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language: Pascal
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filename: learnpascal.pas
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contributors:
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- ["Ganesha Danu", "http://github.com/blinfoldking"]
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---
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>Pascal is an imperative and procedural programming language, which Niklaus Wirth designed in 1968–69 and published in 1970, as a small, efficient language intended to encourage good programming practices using structured programming and data structuring. It is named in honor of the French mathematician, philosopher and physicist Blaise Pascal.
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source : [wikipedia](https://en.wikipedia.org/wiki/Pascal_(programming_language))
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to compile and run a pascal program you could use a free pascal compiler. [Download Here](https://www.freepascal.org/)
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```pascal
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//Anathomy of a Pascal Program
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//this is a comment
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{
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this is a
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multiline comment
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}
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//name of the program
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program learn_pascal; //<-- dont forget a semicolon
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type
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{
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this is where you should delcare a custom
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data-types
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}
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var
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{
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this is where you should declare a variable
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}
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//main program area
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begin
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{
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area to declare your instruction
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}
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end. // End of a main program area should required a "." symbol
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```
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```pascal
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//declaring variable
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//you can do this
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var a:integer;
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var b:integer;
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//or this
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var
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a : integer;
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b : integer;
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//or this
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var a,b : integer;
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```
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```pascal
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program Learn_More;
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//Lets learn about data types and their operations
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//Declaring variables
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var
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int : integer; // a variable that contains an integer number data types
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ch : char; // a variable that contains a character data types
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str : string; // a variable that contains a string data types
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r : real; // a variable that contains a real number data types
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bool : boolean; //a variables that contains a Boolean(True/False) value data types
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Begin
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int := 1;// how to assign a value to a variable
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r := 3.14;
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ch := 'a';
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str := 'apple';
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bool := true;
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//pascal is not a case-sensitive language
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//arithmethic operation
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int := 1 + 1; // int = 2 overwriting the previous assignment
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int := int + 1; // int = 2 + 1 = 3;
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int := 4 div 2; //int = 2 a division operation which the result will be floored
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int := 3 div 2; //int = 1
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int := 1 div 2; //int = 0
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bool := true or false; // bool = true
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bool := false and true; // bool = false
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bool := true xor true; // bool = false
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r := 3 / 2; // a division operator for real
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r := int; // you can assign an integer to a real variable but not the otherwise
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c := str[1]; // assign the first letter of str to c
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str := 'hello' + 'world'; //combining strings
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End.
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```
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```pascal
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``` |