Slide IST103 IST103 Bahasa Pemrograman 03 Structured Control

(1)

(Pemrograman Visual)

#2

(2)

Isi

• Conditional Statements

• _{Decisions (?, if statement, switch}

statement)

• Iteration (for statement, while statement)

(3)

Conditional Statements

• Conditional statements biasa digunakan

untuk menguji suatu kondisi, kondisi dari

statement tersebut biasanya untuk

menentukan arah dari flow suatu

algoritma.

• Conditional statement sering digunakan

pada suatu pemilihan percabangan

(Decision / selection) dan perulangan

(looping), untuk menentukan alur

(4)

Conditional Statements

• _{Relational Operators}

Nama

Operator

Operasi

Keterangan

==

Equality

x == 4 hasilnya  true atau false

!=

Inequality

x != 4 hasilnya  true atau false

<

Less than

x < 4 hasilnya  true atau false

>

Greater than

x > 4 hasilnya  true atau false

<=

Less than or equal

x <= 4 hasilnya  true atau false

>=

Greater than or equal

x >= 4 hasilnya  true atau false

• Relational Operators

, digunakan pada

conditional

statements

untuk menentukan suatu kondisi

(5)

Conditional Statements

• _{Logical Operators}

x

y

x && y

x || y

!x

false

true

false

true

false

true

True

false

true

false

true

True

true

false

• Logical Operators, sering digunakan pada

(6)

Decisions

? Conditional Operator

• Syntax:

• Example:

testExpr ? yesExpr : noExpr

minVal = x <= y ? x :

y;

(7)

Decisions

if Statement

• Fungsi dari suatu if statement adalah

untuk mengatur arah dari alur program

sesuai dengan kondisi yang ditetapkan.

Contoh:

B

? A=5

C

(8)

Decisions

• Simple if statement

if (bobot >=2) {

Contoh dalam Syntax

Java

Contoh dalam Syntax

(9)

Decisions

if Statement

• Simple if statement without else

if (status==“Lulus”) {

update=true;

System.out.println(“updated”)

}

System.out.println(“terima kasih”);

if (status==“Lulus”) {

update=true;

System.out.println(“updated”)

}

System.out.println(“terima kasih”);

Contoh dalam Syntax

Java

Contoh dalam Syntax

Java

Status

== “Lulus

”

Status

== “Lulus

”

_{update =}

true

update =

true

Ya

Tidak

Cetak “terima kasih” Cetak “terima

kasih”

Cetak

“updated”

(10)

Decisions

if Statement

• Combined condition if

statement

if ((mhs_job==“part_time”) && (mhs_kel==“wanita”)) {

Contoh dalam Syntax

Java

Contoh dalam Syntax

Java

mhs_job==“pa rt_time” AND mhs_kel==“wa

nita” mhs_job==“pa

rt_time” AND mhs_kel==“wa

if ((no_rekor==17) || (no_rekor==16)) {

Contoh dalam Syntax

Java

Contoh dalam Syntax

(11)

Decisions

switch Statement

switch (pilihan) {

case 1: System.out.println(“Anda pilih 1”);

break;

case 2: System.out.println(“Anda pilih 2”);

break;

case 3: System.out.println(“Anda pilih 3”);

break;

case 4: System.out.println(“Anda pilih 4”);

break;

default: System.out.println(“salah pilih”);break;

}

switch (pilihan) {

case 1: System.out.println(“Anda pilih 1”);

break;

case 2: System.out.println(“Anda pilih 2”);

break;

case 3: System.out.println(“Anda pilih 3”);

break;

case 4: System.out.println(“Anda pilih 4”);

break;

default: System.out.println(“salah pilih”);break;

}

Contoh dalam Syntax

Java

Contoh dalam Syntax

Java

3

pilihan

Cetak “Anda pilih 1” Cetak “Anda

pilih 1”

4 default

1 ₂

Cetak “Anda pilih 2” Cetak “Anda

pilih 2” Cetak “Anda _{pilih 3”} Cetak “Anda

pilih 3” Cetak “Anda _{pilih 4”} Cetak “Anda

pilih 4” Cetak “Salah _pilih” Cetak “Salah

(12)

Decisions

switch Statement

import javax.swing.JOptionPane;

public class JOption_switch {

public static void main(String[] args) {

String input = JOptionPane.showInputDialog("Make your

choice (1-4)?");

int pilihan = Integer.parseInt(input);

switch(pilihan) {

case 1: System.out.println("Anda pilih 1"); break;

case 2: System.out.println("Anda pilih 2"); break;

case 3: System.out.println("Anda pilih 3"); break;

case 4: System.out.println("Anda pilih 4"); break;

default: System.out.println("Anda memilih selain 1 s/d

4");

break;

}

import javax.swing.JOptionPane;

public class JOption_switch {

public static void main(String[] args) {

String input = JOptionPane.showInputDialog("Make your

choice (1-4)?");

int pilihan = Integer.parseInt(input);

switch(pilihan) {

case 1: System.out.println("Anda pilih 1"); break;

case 2: System.out.println("Anda pilih 2"); break;

case 3: System.out.println("Anda pilih 3"); break;

case 4: System.out.println("Anda pilih 4"); break;

default: System.out.println("Anda memilih selain 1 s/d

4");

break;

}

(13)

Iteration

• Fungsi dari suatu iteration adalah

(14)

Iteration

for - loops

i < 6

i = 1

True

False

Statements

Here

Statements

Here

i++

for - loops

for (

initialization

;

termination

;

multiplier

)

{

// your code goes here

}

for (

initialization

;

termination

;

multiplier

)

{

// your code goes here

}

for(int i=0; i<6; i++) {

System.out.println("Count is: " + i);

}

for(int i=0; i<6; i++) {

System.out.println("Count is: " + i);

}

Syntax for - loops in

java

Syntax for - loops in

java

Example for - loops java

(15)

Iteration

for - loops

for (int i = 0; i < kalimat.length(); i++)

{

if (cari == kalimat.charAt(i)) {

jumlah++;

if (cari == kalimat.charAt(i)) {

jumlah++;

public class string_charCheck {

public static void main(String[] args) {

String kalimat;

char cari;

int jumlah=0;

System.out.println("Masukkan kalimat

anda! ");

Scanner input1 = new

Scanner(System.in);

kalimat = input1.nextLine();

System.out.println("Masukkan karakter

yg ingin dihitung! ");

Scanner input2 = new

Scanner(System.in);

cari = input2.nextLine().charAt(0);

import java.util.Scanner;

public class string_charCheck {

public static void main(String[] args) {

String kalimat;

char cari;

int jumlah=0;

System.out.println("Masukkan kalimat

anda! ");

Scanner input1 = new

Scanner(System.in);

kalimat = input1.nextLine();

System.out.println("Masukkan karakter

yg ingin dihitung! ");

Scanner input2 = new

Scanner(System.in);

cari = input2.nextLine().charAt(0);

Example for –

searching

number of

character in a

sentence

Example for –

searching

number of

character in a

sentence

(16)

Iteration

while - loops

i < 6

while - loops

Front check

while - loops

while (

i < 6

) {

while - loops

(17)

Iteration

while - loops

class WhileDemo {

public static void main(String[] args){

int count = 1;

class WhileDemo {

public static void main(String[] args){

int count = 1;

class WhileDemo {

public static void main(String[] args){

int count = 1;

class WhileDemo {

public static void main(String[] args){

int count = 1;

Contoh front check

repetition in java

Contoh front check

repetition in java

Syntax rear check

repetition in java

Syntax rear check

(18)

break Statement in Iteration

if (str.charAt(i)==cari) {

break;

if (str.charAt(i)==cari) {

break;

}

…

Contoh break pada java

(19)

break Statement in Iteration

class BreakDemo

{

public static void main(String[] args) {

int[] arrayOfInts = { 32, 87, 3, 589, 12, 1076, 2000, 8, 622,

class BreakDemo

{

public static void main(String[] args) {

int[] arrayOfInts = { 32, 87, 3, 589, 12, 1076, 2000, 8, 622,

Contoh break pada java

(20)

continue Statement in Iteration

if (str.charAt(i)!=cari) {

continue;

if (str.charAt(i)!=cari) {

continue;

Contoh break pada java

(21)

continue Statement in Iteration

class

ContinueDemo

{

public static void main(String[] args) {

String searchMe = "peter piper picked a peck of pickled

peppers";

int max = searchMe.length();

int numPs = 0;

for (int i = 0; i < max; i++) {

//interested only in p's

if (searchMe.charAt(i) != 'p')

continue;

//process p's

numPs++;

}

System.out.println("Found " + numPs + " p's in the

string.");

}

class

ContinueDemo

{

public static void main(String[] args) {

String searchMe = "peter piper picked a peck of pickled

peppers";

int max = searchMe.length();

int numPs = 0;

for (int i = 0; i < max; i++) {

//interested only in p's

if (searchMe.charAt(i) != 'p')

continue;

//process p's

numPs++;

}

System.out.println("Found " + numPs + " p's in the

string.");

}

Contoh continue pada

java

Contoh continue pada

(22)

Methods

• Method is known as a function or procedure in

other languages.

public class MinTest {

public static void main( String [ ] args )

{

int a = 3;

int b = 7;

System.out.println( min( a, b ) );

}

// Method declaration

public static int min( int x, int y ) {

return x < y ? x : y;

}

public class MinTest {

public static void main( String [ ] args )

{

int a = 3;

int b = 7;

System.out.println( min( a, b ) );

}

// Method declaration

public static int min( int x, int y ) {

return x < y ? x : y;

(23)

Exercises

• Modifikasi

_{class calculatorApp}

_(pada

slide berikutnya)

, sehingga membaca

input untuk x dan y, dengan menggunakan

JOptionPane.

• Modifikasi program

Example for –

searching number of character in a

sentence

dengan menggunakan while –

loops.

• Kirim ke:

augury.elrayeb@upj.ac.id

▫Subject: tugas bhsprog 01

(24)

AER – 2011/2012 Universitas Pembangunan Jaya – SIF_TIF SIF1213 - 24

class calculatorApp {

public static void main(String[] args) {

double x = 7.5;

double y = 3.3;

System.out.println("x = " + x);

System.out.println("y = " + y);

System.out.println("x + y = " + (x+y));

System.out.println("x - y = " + (x-y));

**System.out.println("x * y = " + (x*y));**

System.out.println("x / y = " + (x/y));

}

class calculatorApp {

public static void main(String[] args) {

double x = 7.5;

double y = 3.3;

System.out.println("x = " + x);

System.out.println("y = " + y);

System.out.println("x + y = " + (x+y));

System.out.println("x - y = " + (x-y));

**System.out.println("x * y = " + (x*y));**

System.out.println("x / y = " + (x/y));

}

(25)

Iteration

for - loops

for (int i = 0; i < kalimat.length(); i++)

{

if (cari == kalimat.charAt(i)) {

jumlah++;

if (cari == kalimat.charAt(i)) {

jumlah++;

public class string_charCheck {

public static void main(String[] args) {

String kalimat;

char cari;

int jumlah=0;

System.out.println("Masukkan kalimat

anda! ");

Scanner input1 = new

Scanner(System.in);

kalimat = input1.nextLine();

System.out.println("Masukkan karakter

yg ingin dihitung! ");

Scanner input2 = new

Scanner(System.in);

cari = input2.nextLine().charAt(0);

import java.util.Scanner;

public class string_charCheck {

public static void main(String[] args) {

String kalimat;

char cari;

int jumlah=0;

System.out.println("Masukkan kalimat

anda! ");

Scanner input1 = new

Scanner(System.in);

kalimat = input1.nextLine();

System.out.println("Masukkan karakter

yg ingin dihitung! ");

Scanner input2 = new

Scanner(System.in);

cari = input2.nextLine().charAt(0);

Example for –

searching

number of

character in a

sentence

Example for –

searching

number of

character in a

sentence

(26)

Terima Kasih

“

The More You Share,