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hello.pas
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PROGRAM hello (output);
{Write 'Hello, world.' ten times.}
TYPE
rootInput = ARRAY [0..11] OF char;
ansType=char;
VAR
i : integer;
str1: rootInput;
temp: ARRAY[0..11] OF char;
ans: char;
number: integer;
booleanAns: boolean;
times : integer;
k : integer;
PROCEDURE printGuide;
BEGIN
dwriteln('+---------------------------------------------------+');
dwriteln('| Welcome to My Pascal Compiler |');
dwriteln('|---------------------------------------------------|');
dwriteln('| This program showcases the features of the custom |');
dwriteln('| Pascal compiler, including predefined functions, |');
dwriteln('| procedures, and various Pascal constructs. |');
dwriteln('| To run this program, run the following: |');
dwriteln('| java -cp classes Pascal execute guide.pas |');
dwriteln('+---------------------------------------------------+');
dwriteln;
{ Example: Hello World }
dwriteln('+---------------------------------------------------+');
dwriteln('|-----------------Hello World Example--------------|');
dwriteln('| PROGRAM hello (output); |');
dwriteln('| BEGIN {hello} |');
dwriteln('| dwriteln(''Hello, world.''); |');
dwriteln('| END; |');
dwriteln('| END {hello}. |');
dwriteln('+---------------------------------------------------+');
dwriteln;
{ Example: If-Else }
dwriteln('+---------------------------------------------------+');
dwriteln('|------------------If-Else Example-----------------|');
dwriteln('| IF i = 1 THEN f := 10 |');
dwriteln('| ELSE IF i = 2 THEN f := 20 |');
dwriteln('| ELSE IF i = 3 THEN t := 30 |');
dwriteln('| ELSE IF i = 4 THEN f := 40 |');
dwriteln('| ELSE f := -1; |');
dwriteln('+---------------------------------------------------+');
dwriteln;
{ Example: Arrays }
dwriteln('+---------------------------------------------------+');
dwriteln('|------------------Array Example-------------------|');
dwriteln('| Visit: arraytest.pas for the full array example. |');
dwriteln('+---------------------------------------------------+');
dwriteln;
{ Example: Record }
dwriteln('+---------------------------------------------------+');
dwriteln('|------------------Record Example------------------|');
dwriteln('| rec1 = RECORD |');
dwriteln('| i : integer; |');
dwriteln('| r : real; |');
dwriteln('| b1, b2 : boolean; |');
dwriteln('| c : char |');
dwriteln('| END; |');
dwriteln('+---------------------------------------------------+');
dwriteln;
{ Example: For Loops }
dwriteln('+---------------------------------------------------+');
dwriteln('|------------------For Loop Example----------------|');
dwriteln('| FOR k := j TO 5 DO n := k; |');
dwriteln('| |');
dwriteln('| FOR k := n DOWNTO 1 DO j := k; |');
dwriteln('| |');
dwriteln('| FOR i := 1 TO 2 DO |');
dwriteln('| BEGIN |');
dwriteln('| FOR j := 1 TO 3 DO |');
dwriteln('| BEGIN |');
dwriteln('| k := i*j |');
dwriteln('| END |');
dwriteln('| END |');
dwriteln('+---------------------------------------------------+');
dwriteln;
{ Example: While Loop }
dwriteln('+---------------------------------------------------+');
dwriteln('|-----------------While Loop Example---------------|');
dwriteln('| WHILE root*root - number > 0.000001 DO |');
dwriteln('| BEGIN |');
dwriteln('| root := (number/root + root)/2 |');
dwriteln('| END |');
dwriteln('+---------------------------------------------------+');
dwriteln;
{ Example: Switch Case }
dwriteln('+---------------------------------------------------+');
dwriteln('|------------------Case Statement------------------|');
dwriteln('| CASE i+1 OF |');
dwriteln('| 1: j := i; |');
dwriteln('| -8: j := 8*i; |');
dwriteln('| 5, 7, 4: j := 574*i; |');
dwriteln('| END; |');
dwriteln('+---------------------------------------------------+');
dwriteln;
{ Example: Function and Procedure }
dwriteln('+---------------------------------------------------+');
dwriteln('|-------------Function and Procedure Example-------|');
dwriteln('| FUNCTION root(x : real) : real; |');
dwriteln('| VAR r : real; |');
dwriteln('| BEGIN |');
dwriteln('| r := 1; |');
dwriteln('| REPEAT |');
dwriteln('| r := (x/r + r)/2; |');
dwriteln('| UNTIL abs(x/sqr(r) - 1) < epsilon; |');
dwriteln('| root := r; |');
dwriteln('| END; |');
dwriteln('| |');
dwriteln('| PROCEDURE print(n : integer; root : real); |');
dwriteln('| BEGIN |');
dwriteln('| dwriteln(''The square root of '', |');
dwriteln('| number:4, '' is '', root:8:4); |');
dwriteln('| END; |');
dwriteln('+---------------------------------------------------+');
dwriteln;
{ Example: Read and Write }
dwriteln('+---------------------------------------------------+');
dwriteln('|------------------Read and Write------------------|');
dwriteln('| write(''Type an integer: ''); |');
dwriteln('| readln(i); |');
dwriteln('| writeln(''You typed: '', i); |');
dwriteln('+---------------------------------------------------+');
dwriteln;
{ Example: Repeat Statement }
dwriteln('+---------------------------------------------------+');
dwriteln('|-----------------Repeat Statement-----------------|');
dwriteln('| REPEAT |');
dwriteln('| r := (n/r + r)/2 |');
dwriteln('| UNTIL r*r - n < epsilon; |');
dwriteln('+---------------------------------------------------+');
dwriteln;
{ Example: Subrange }
dwriteln('+---------------------------------------------------+');
dwriteln('|------------------Subrange Example----------------|');
dwriteln('| TYPE |');
dwriteln('| subrange = 10..20; |');
dwriteln('+---------------------------------------------------+');
dwriteln;
{ Example: Nested Procedures }
dwriteln('+---------------------------------------------------+');
dwriteln('|----------------Nested Procedures-----------------|');
dwriteln('| PROCEDURE nested(VAR n, m : integer); |');
dwriteln('| CONST ten = 10; |');
dwriteln('| TYPE subrange = five..ten; |');
dwriteln('| VAR a, b, c : integer; s : subrange; |');
dwriteln('| PROCEDURE deeply; |');
dwriteln('| VAR w : real; |');
dwriteln('| BEGIN |');
dwriteln('| w := i; |');
dwriteln('| nested(a, m); |');
dwriteln('| w := forwarded(b, w); |');
dwriteln('| END; |');
dwriteln('| END; |');
dwriteln('+---------------------------------------------------+');
dwriteln;
{ Final Message }
dwriteln('+---------------------------------------------------+');
dwriteln('|------------End of Showcase Program---------------|');
dwriteln('+---------------------------------------------------+');
dwriteln;
END;
PROCEDURE PrintContact;
BEGIN
dwriteln('+---------------------------------------------------+');
dwriteln('| Dhruvil Mehta |');
dwriteln('| Email: [email protected] |');
dwriteln('| Mobile: +1 (657) 631-8860 |');
dwriteln('| Current location: Los Angeles |');
dwriteln('| Actively looking for Full-Time opportunities starting May 2025|');
dwriteln('+---------------------------------------------------+');
END
PROCEDURE PrintResume;
BEGIN
dwriteln('+---------------------------------------------------+');
dwriteln('| Dhruvil Mehta |');
dwriteln('| Email: [email protected] |');
dwriteln('| Mobile: +1 (657) 631-8860 |');
dwriteln('| Current location: Los Angeles |');
dwriteln('| Actively looking for Full-Time opportunities starting May 2025|');
dwriteln('+---------------------------------------------------+');
END
FUNCTION root(x : integer) : integer;
BEGIN
root:= x;
END;
PROCEDURE printStr(str: rootInput);
VAR
i: integer;
BEGIN
dwriteln(str);
END;
BEGIN {hello}
REPEAT
dwriteln;
dwriteln('-------------------------------');
dwriteln('To print hello world, Press 1');
dwriteln('To print my Contact details, Press 2');
dwriteln('To print Resume, Press 3');
dwriteln('To know more about this compiler, Press 4');
dwriteln('To quit, Press 0');
dwriteln('-------------------------------');
dread(number);
dwriteln('-------------------------------');
IF number = 1 THEN BEGIN
str1:='Hello, World';
dwriteln('How many times do you want print Hello, World?');
dread(times);
FOR k := 0 TO times-1 DO BEGIN
printStr(str1);
END;
END
ELSE IF number = 2 THEN BEGIN
PrintContact;
END
ELSE IF number = 3 THEN BEGIN
PrintResume;
END
ELSE IF number = 4 THEN BEGIN
printGuide;
END
ELSE IF number < 0 THEN BEGIN
dwriteln('*** ERROR: number < 0 not allowed');
END
ELSE IF number = 0 THEN BEGIN
dwriteln('Thank you for using my compiler');
dwriteln('Visit src/ folder to view source code for this project');
dwriteln('Here is my GitHub Link to view more projects https://github.com/dhruvilmehta/');
END
ELSE IF number <> 0 THEN BEGIN
dwriteln('Invalid input');
END
UNTIL number = 0
END.
END {hello}.