Example Program Fibonacci di Pascal

Example program fibonacci with pascal :
Example 1 :

program Fibonacci;

var
  i, x, m, n : integer;

begin   {Begins the main part}

  writeln ('Enter the lenghts of the sequence');
  readln (x);
  n := 0; m:=1; {We have to initialize our sequence}
  writeln (n);  {and have the first output}
  writeln (m);
  i:=0;         {"i" is the number of the current iteration}


while i<x-2 do  {The first 2 "x's" we've already had
                 that's why we must get rid of them}

begin           {Begins the iteration loop}

  i:=i+1;
  m:=m+n; n:=m-n;
  writeln(m);

  if i=x-2 then writeln('Finished !');

                {The program has calculated everything
                 and lets us know about it}

end;            {The end of the while-do loop}

  readln;       {This is needed to have enough time
                 to read the output}

end. 

Example 2 :

program fibonacci;

function fib(n:integer): integer;
begin
    if (n <= 2) then
        fib := 1
    else
        fib := fib(n-1) + fib(n-2);
end;

var
    i:integer;

begin
    for i := 1 to 16 do
        write(fib(i), ', ');
    writeln('...');
end. 

Example 3 :

program bilangan_fibonacci;

{menampilakan bilangan fibonacci kurang dari 100}

uses wincrt;

var

x : array [1..11] of integer;

i : integer;

begin

clrscr;

       x[1] := 1;

       x[2] := 1;

       write (x[1], ' ');

       write (x[2], ' ');

       for i := 3 to 11 do

           begin

                x[i] := x[i - 1] + x[i - 2];

                write (x[i], ' ');

           end;

end.

 

Example 4 :

PROGRAM TestFib;

USES Fib_I, Fib_R, Fib_D;

VAR
  I: INTEGER;

BEGIN
  WRITELN ('Fibonacci function test program version Pascal 1');
  WRITELN ('Enter a negative number to quit');
  WRITE ('I?  ');
  READ (I);
  WHILE I >= 0 DO BEGIN
    WRITELN ('Dynamic:   ', Fib_D.F (I));
    WRITELN ('Iterative: ', Fib_I.F (I));
    WRITELN ('Recursive: ', Fib_R.F (I));
    WRITE ('I?  ');
    READ (I);
  END
  
END.