[Pascal/en] Add pascal language (#3025)

* added a pascal tutorial

* added a pascal tutorial

* add more operation

1 files changed, 96 insertions, 0 deletions

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