MODUL V
PERCABANGAN
JAMAK
DENGAN
CASE ... OF
A. TUJUAN
- Memahami salah
satu jenis statement kendali untuk pemilihan proses
- Memahami proses
pengambilan keputusan dengan statement case ... of
- Memahami variasi
proses pengambilan keputusan bersifat jamak
- Mampu mengaplikasikan
proses pengambilan keputusan dalam program
B. DASAR TEORI
Statement CASE merupakan alternatif
dari statement IF dengan pilihan ganda/jamak. Biasanya pada masalah tertentu,
CASE akan lebih memberi kejelasan dibandingkan IF dan semua permasalahan yang
dibuat dengan CASE akan bisa juga dibuat dengan IF, tetapi tidak semua
permasalahan yang dibuat dengan IF bisa dibuat dengan CASE.
Bentuk umum dari CASE ... OF adalah
:
CASE
nama_variabel OF
nilai_variabel : statement-statement;
nilai_variabel : statement-statement;
ElsE statement-statement; {setelah ELSE tidak
ada titik dua}
END;
Percabangan jamak dimaksudkan untuk
mengecek isi dari suatu variabel. Variabel ini biasanya disebut variabel
selektor. Pada struktur di atas, variabel yang akan dicek isinya adalah
variabel dengan nama nama_variabel. Kemudian, isi variabel tersebut dicocokkan
dengan pilihan yang ada di bawahnya. Pada pilihan yang cocok,
instruksi/statement yang berada setelah tanda titik dua (:) akan dikerjakan.
Jika tidak ada pilihan yang sesuai, maka statement yang akan dikerjakan adalah
statement pada pilihan ELSE.
C. LATIHAN SOAL
- Nomor Program 0501
Keluarga Pak Hamid memiliki 3 orang anak
berturu-turut, yaitu : Azam, Sarah, dan yang bungsu bernama Hasim. Tulislah
program berikut ini dan amatilah outputnya!
PROGRAM
nama_anak;
USES
CRT;
VAR
no_anak : byte;
Na_anak : string;
BEGIN
CLRSCR;
WRITELN('Program untuk mengetahui nama
anak keluarga hamid');
WRITE('Tulis anak ke-');READLN(no_anak);
CASE no_anak OF
1 : WRITELN('Anak ke-',no_anak,'
bernama Azam');
2 : WRITELN('Anak ke-',no_anak,'
bernama Sarah');
3 : WRITELN('Anak ke-',no_anak,'
bernama Hasim');
ELSE WRITELN('Hanya ada anak ke 1, 2,
dan 3');
END;
Writeln ( ‘Nama anak
ke-‘,no_anak,na_anak);
READLN;
END.
- Nomor Program 0502
Tulislah program berikut ini dan amatilah
outputnya!
PROGRAM
ramalan;
USES
CRT;
VAR
bln_anda, bln_pacar, nilai_ramal : byte;
nama_anda, nama_pacar : string[30];
BEGIN
CLRSCR;
WRITE('Siapa nama anda?
');READLN(nama_anda);
WRITE('Bulan ke berapa anda lahir?
');READLN(bln_anda);
WRITE('Siapa nama pacar anda?
');READLN(nama_pacar);
WRITE('Bulan ke berapa dia lahir?
');READLN(bln_pacar);
nilai_ramal:=(bln_anda + bln_pacar) mod
13;
CASE nilai_ramal OF
0 : WRITELN('Anda berdua tidak
cocok');
1,3 : WRITELN('Anda berdua memang
cocok');
5..7 : WRITELN('Kalian berdua harus
saling mengalah');
2,4,8 : WRITELN('Cinta bukanlah
segalanya. Berpikirlah logis!');
9..12 : WRITELN('Masa depan lebih
penting bagi kalian');
END;
READLN;
END.
- Nomor Program 0503
Buatlah program yang mirip dengan nomor program
0403, tetapi dengan menggunakan percabangan jamak CASE ... OF!
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- Nomor Program 0504
Buatlah program yang menampilkan output untuk
meminta masukan dari user berupa nomor urut hari dan akan menghasilkan output
nama hari yang sesuai, yaitu : 1 = minggu, 2 = senin, 3 = selasa, 4 = rabu, 5 =
kamis, 6 = jumat, 7 = sabtu.
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- Nomor Program 0505
Buatlah program yang menampilkan output untuk
meminta masukan dari user berupa nomor urut bulan dan akan menghasilkan output
nama bulan yang sesuai. Misalnya yang diinputkan adalah 4, maka hasilnya adalah
April.
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- Nomor Program 0506
Buatlah program untuk memberi komentar nilai huruf
yang diinputkan oleh user dengan komentar sebagai berikut :
NILAI KOMENTAR
A Istimewa
B Baik
C Cukup
D Kurang
E Tidak
Lulus
Apabila yang diinputkan tidak sesuai, beri pesan
khusus!
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- Nomor Program 0507
Buatlah program untuk menghitung besarnya gaji
pokok, tunjangan jabatan, dan gaji total seorang karyawan sesuai dengan tabel sebagai
berikut :
|
Golongan
|
Gaji Pokok
|
Tunjangan Jabatan
|
|
1
|
100000
|
5%
|
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2
|
120000
|
10%
|
|
3
|
150000
|
10%
|
|
4
|
175000
|
10%
|
|
5
|
200000
|
10%
|
|
6
|
220000
|
13%
|
|
7
|
250000
|
17%
|
Output :
Berapa
golongan anda? 1 <- meminta input
dari user
Gaji
Pokok : 100000
Tunjangan
Jabatan :
10000
Gaji
Total : 110000
