Program Regulafalsi (MetNum)

Berikut adala contoh program Regulafalsi Metode Numerik dengan menggunakan bahasa pemrograman pascal :

uses crt;
label ulang ;
var
x1, x2, x3, y1, y2, y3 : real ;
i : integer ;
ab : char ;
data1 : real ;
begin
ulang :
clrscr ;
writeln ( ‘ tentukan nilai akar dari persamaan f(x)= x3 x^3 + x^2 – 3x – 3 – 0 dengan metode regula falsi ‘) ;
write ( ‘ masukan nilai x1 = ‘ ) ; readln (x1);
y1 := x1 * x1 * x1 + x1 * x1 – 3 * x1 – 3 ;
writeln ( ‘ nilai f(x) = ‘, y1 : 0 : 4);
repeat
begin
write ( ‘ masukan nilai x2 = ‘ ) ; readln (x2);
y2 := x2 * x2 * x2 + x2 * x2 – 3 * x2 – 3;
write ( ‘ nilai f(x2) = ‘ , y2 : 0 : 4 ) ;
end ;
if ( y1 * y2 ) < 0 then
writeln ( ‘ syarat nilai OK ‘ )
else
writeln ( ‘ nilai x2 tidak sesuai ‘ );
until ( y1 * y2 ) < 0 ;
writeln ;
writeln ( ‘ penyelesaian karakteristik dengan metode regulafalsi : ‘ ) ;
writeln ( ‘ ======================================================== ‘ ) ;
writeln ( ‘ N x f(x) error ‘ ) ;
writeln ( ‘ ======================================================== ‘ ) ;
repeat
begin
i := i + 1 ; x3 := (x2 – (y2/( y2 – y1 )) * ( x2 – x1 ));
y3 := x3 * x3 * x3 + x3 * x3 – 3 * x3 – 3;
if i < 10 then
writeln (”,i,”,x3,’:’,y3,’:’,abs (y3),’:’);
if y1 * y3 < 0 then
begin
x2 := x3 ; y2 := y3;
end
else
begin
x1 := x3 ; y1 := y3;
end;
end;
until abs (y3) <1e-08;
writeln ( ‘ ——————————————————– ‘ );
writeln ( ‘ akar persamaannya = , ‘ , x3 ) ;
writeln ( ‘ errornya = , ‘ , abs(y3)) ;
writeln ( ‘ ——————————————————– ‘ );
writeln ( ‘ apakah anda ingin mengulanginya (y/t)’ ) ;
readln (ab) ;
if ( ab = ‘y’ ) or ( ab = ‘Y’ ) then
begin
goto ulang
end ;
end.

^Rachmatika Irfani^

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