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8/8/2019 05 Selection Conditional
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SELECTION
CONDITIONALOleh: M. Ade Erik (19870911 201001 1 006)
Doc Versi. 05.00/Pas/OSN/TIK/2010
SMA Negeri 1 Tegal
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Pembahasan:
IF
Satu Statement
Banyak Statement If ± Then ± Else
Nested If
CASE
Satu Statement
Banyak Statement
Case ± Else
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IF Satu Statement
Pernyataan IF biasanya diikuti dengan pernyataan ELSE,
yang akan dikerjakan bila kondisi pernyataan IF
menghasilkan kondisi FALSE
Syntax: If <ekpresi boolean> then
Begin <pernyataan>
End;
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IFBanyak Statement
If <ekpresi boolean> then
begin <pernyataan> end
Else if <ekpresi boolean> then
begin <pernyataan> end;
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Nested if (If Bersarang)
If <ekpresi boolean> then
Begin
If <ekpresi boolean> then
Begin
end
end;
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Contoh Soal
Tentukan genap atau ganjil dari suatu bilangan.
Input: 4
Output: Bilangan tersebut adalah bilangan Genap
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Penjelasan:
Lakukan pengujian bilangan, jika n mod 2 = 1 then
tampilkan pesan = Bilangan tersebut adalah bilangan
ganjil, jika tidak n mod 2 <> 1 maka tampilkan pesanBilangan tersebut adalah bilangan genap.
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uses wincrt;
Var n:integer;
Begin write('n= ');readln(n);
if (n mod 2 = 1) then
begin
write('Bilangan tersebut adalah bilangan ganjil');
End else
begin
write('Bilangan tersebut adalah bilangan genap');
end;
end.
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Soal:
Konversi nilai. Jika 10>=n = µE¶; jika 10<n<=40 = µD¶; jika
40<n<=70 = µC¶; jika 70<n<=90 = µB¶ ; jika 90<n<=100 =
µA¶; Contoh
Input: n=60
Output: nilai=µC¶
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Penjelasan
Lakukan seleksi nilai,
if n<=10 then nilai:=µE¶ else
if (n>10) and (n<=40) then nilai:=µD¶ else
If (n>40) and (n<=70) then nilai:=µC¶ else
If (n>70) and (n<=90) then nilai:=µB¶ else
If (n>90) and (n<=100) then nilai:=µA¶
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uses wincrt;
Var n:integer; nilai:char;
begin
write('n= ');readln(n);
if n<=10 then begin nilai:='E' end else
if (n>10) and (n<=40) then begin nilai:='D' end else
If (n>40) and (n<=70) then begin nilai:='C' end else
If (n>70) and (n<=90) then begin nilai:='B' end else
If (n>90) and (n<=100) then begin nilai:='A'end;
write('Nilai= ',nilai);
end.
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CASE .. OF
Pernyataan CASE dipergunakan apabila kita menulis
program yang memerlukan banyak pernyataan
IF...THEN...ELSE, sehingga program akan tampak lebih
jelas untuk dibaca
Syntax:
Case <variable> of
<nilai variable> : <pernyataan>
<nilai variable> : <pernyataan> Else
<nilai variable> : <pernyataan>
End;
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Contoh if:
if operator = '*' then result := number1 * number2
else if operator = '/' then result := number1 / number2
else if operator = '+' then result := number1 + number2 else if operator
= '-' b result := number1 - number2
else invalid_operator = 1;
Contoh case:
case operator of
'*' : result:= number1 * number2; '/' : result:= number1 / number2;
'+' : result:= number1 + number2;
'-' : result:= number1 - number2;
else invalid_operator := 1 end;
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Soal:
Ubahlah script berikut dalam bentuk case of
uses wincrt;
Var n:integer; nilai:char; begin
write('n= ');readln(n);
if n<=10 then begin nilai:='E' end else
if (n>10) and (n<=40) then begin nilai:='D' end else
If (n>40) and (n<=70) then begin nilai:='C' end else
If (n>70) and (n<=90) then begin nilai:='B' end else
If (n>90) and (n<=100) then begin nilai:='A'end;
write('Nilai= ',nilai);
end.
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Jawab:
uses wincrt;
Var n:integer; nilai:char;
begin
write('n= ');readln(n);
case n of
0..10:nilai:='E';
10..40:nilai:='D';
40..70:nilai:='C'; 70..90:nilai:='B';
90..100:nilai:='A';
End; write('Nilai= ',nilai);end.
