flussdiagramme

Werbung
Learning By Doing
Sequenz
// Tu01.java
import ch.aplu.turtle.*;
class Tu01
{
Tu01()
{
Turtle john = new Turtle();
john.forward(20);
john.right(90);
john.forward(20);
john.left(90);
john.forward(20);
john.right(90);
john.forward(20);
john.left(90);
}
public static void main(String[] args)
{
new Tu01();
}
}
A n w e isu n g
A n w e isu n g
A n w e isu n g
Learning By Doing
Iteration: while-Struktur
// Tu02.java, while-Struktur
import ch.aplu.turtle.*;
class Tu02
{
Tu02()
{
Turtle john = new Turtle();
int i = 0;
while (i < 5)
{
john.forward(20);
john.right(90);
john.forward(20);
john.left(90);
i++;
}
}
public static void main(String[] args)
{
new Tu02();
}
}
nein
B edin gung
erfüllt?
ja
A nw eisung en
while (Bedingung)
{
Anweisungen;
}
Learning By Doing
do-while-Struktur
// Tu03.java, do-while-Struktur
import ch.aplu.turtle.*;
A n w eisu n g e n
class Tu03
{
Tu03()
{
Turtle john = new Turtle();
B ed in g u n g
erfü llt?
int i = 0;
do
{
john.forward(20);
john.right(90);
john.forward(20);
john.left(90);
i = i + 1;
} while (i < 5);
}
public static void main(String[] args)
{
new Tu03();
}
}
ja
n ein
do
{
Anweisungen;
} while (Bedingung)
Learning By Doing
for - Struktur
// Tu04.java, for - Struktur
i=0
import ch.aplu.turtle.*;
class Tu04
{
Tu04()
{
Turtle john = new Turtle();
nein
i<5?
ja
for (int i = 0; i < 5; i++)
{
john.forward(20);
john.right(90);
john.forward(20);
john.left(90);
}
Anweisungen
i++
}
}
public static void main(String[] args)
{
new Tu04();
}
for (Initialisierung; Bedingung; Wertänderung)
{
Anweisungen;
}
Learning By Doing
Selektion: if – else - Struktur
// Tu05.java, if - else - Struktur
import ch.aplu.turtle.*;
class Tu05
{
Tu05()
{
Turtle john = new Turtle();
for (int i = 0; i < 100; i++)
{
john.forward(2);
if (i < 50)
john.left(3.6);
else
john.right(3.6);
}
}
public static void main(String[] args)
{
new Tu05();
}
}
ja
if-Block
Bedingung
erfüllt?
nein
else-Block
if (Bedingung)
{
Anweisungen;
}
else
{
Alternativanweisungen;
}
Learning By Doing
switch - Struktur
// Tu06.java, switch - Struktur
import ch.aplu.turtle.*;
class Tu06
{
Tu06()
{
Turtle john = new Turtle();
for (int i = 0; i < 4; i++)
{
switch(i)
{
case 0:
john.forward(20);
break;
case 1:
john.forward(40);
break;
default:
john.forward(100);
break;
}
john.left(90);
}
}
public static void main(String[] args)
{
new Tu06();
}
}
Ausdruck a
a == wert1?
nein
a == wert2?
ja
Block1
break;
(ohne break)
ja
Block2
break;
ja
Block3
break;
nein
a == wert3?
nein
Defaultblock
switch (ausdruck)
{
case wert1:
Anweisungen;
break;
case wert2:
Anweisungen;
break;
default:
Anweisungen;
break;
}
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