Kelas perulangan
A.//menampilkan tabel Perkalian
public class Perulangan {
public static void main (String[] args) {
int a,b,c;
System.out.println("----------------------------");
System.out.println("i\t i*2\t i*3\t i*4");
System.out.println("----------------------------");
for (int i=1;i<5;i++) {
System.out.print(i + "\t");
a=i*2;
b=i*3;
c=i*4;
System.out.print(a + "\t");
System.out.print(b + "\t");
System.out.print(c + "\n");
}}}
B.//menampilkan belah ketupat (*)
public class Perulangan2 {
public static void main(String args[]) {
int n=5;
int a, b, c;
a = 1; c=n-1;
for (int i=0; i < n*2-1; i++) {
if (i < n) {
for (int j=0; j < n*2-1; j++) {
b=n-a;
if ((j < b ) || (j >= (b+2*a-1))) {
System.out.print(" ");
}
else {
System.out.print("*");
}
}
a = a+1;
}
else {
for (int j=0; j < n*2-1; j++) {
b=n-c;
if ((j < b) || (j >= (b+2*c-1)) ) {
System.out.print(" ");
}
else {
System.out.print("*");
}
}
c = c-1;
}
System.out.println();
}}}
C. //Menampilkan setengah belah ketupat(*)
public class TengahBin {
public static void main (String[] args) {
for (int y=1; y<=5; y++) {
for (int x=1; x<=y; x++) {
System.out.print ("*");
}
System.out.println ();
}
for (int y=1; y<=5; y++) {
for (int x=5; x>=y; x--) {
System.out.print ("*");
}
System.out.println ();
}}}
D. //Menampilkan 100 nama menggunakan "while loop,Do-while loop dan for loop.
public class Wl {
public static void main( String[] args ){
//while loop
/*int i = 4;
while ( i > 0 ){
System.out.print(i);
i--;
}
int x = 0;
while (x<10)
{
System.out.println(x);
x++;
}
//infinite loop
int i=0;
while(i<100){
System.out.println("noni");
i++;
}
//Do-while loop
int x = 0;
do
{
System.out.println(x);
x++;
}while (x<10);
//infinite loop
int i=0;
do{
System.out.println("noni");
i++;
} while (i<100);
//for loop
int i;
for( i = 0; i < 10; i++ ){
System.out.print(i);
}
*/
int i;
for(i=0;i<100;i++){
System.out.println("noni");
}}}
E.//Menampilkan Kalkulator Aritmatika menggunakan switch
public class Kalkulator{
public static void main (String[] args){
String ulangi = "Y";
do {
System.out.println("KALKULATOR ARITMATIKA");
System.out.println("1. Tambah (+)");
System.out.println("2. Kurang (-)");
System.out.println("3. Kali\t (x)");
System.out.println("4. Bagi\t (:)");
int operator;
float angka1, angka2;
float hasil = 1;
System.out.print("\nPilih Operator Aritmatika (1/2/3/4) : ");
operator = Integer.parseInt(System.console(). readLine());
System.out.print("\nMasukkan angka pertama : ");
angka1 = Float.parseFloat(System.console(). readLine());
System.out.print("\nMasukkan angka kedua : ");
angka2 = Float.parseFloat(System.console(). readLine());
switch(operator) {
case 1 : hasil = angka1 + angka2;
break;
case 2 : hasil = angka1 - angka2;
break;
case 3 : hasil = angka1 * angka2;
break;
case 4 : hasil = angka1 / angka2;
break;
default : System.out.println("tidak ada pilihan operator");
}
System.out.print("Hasil : " + hasil);
System.out.print("\nulangi (Y/N) ? ");
ulangi = System.console().readLine();
} while (ulangi.equals("Y") || ulangi.equals("y"));
}}
F. //Menampilkan output dari case yang terpilih
public class Grade{
public static void main( String[] args ){
System.out.println("Masukkan Nilai ??? ");
String grade = System.console().readLine();
int grade1 = Integer.parseInt(grade);
/*if( grade1 >= 90 ){
System.out.println( "Excellent!" );
}
else if( (grade1 < 90) && (grade1 >= 80)){
System.out.println("Good job!" );
}
else if( (grade1 < 80) && (grade1 >= 60)){
System.out.println("Study harder!" );
}
else{
}*/
switch(grade1){
case 100:
System.out.println( "Excellent!" );
break;
case 90:
System.out.println("Good job!" );
break;
case 80:
System.out.println("Study harder!" );
break;
default:
System.out.println("Sorry, you failed.");
}}}
G. //Menampilkan gambar Zigzag menggunakan perulangan
public class Zigzag {
public static void main (String[] args){
int l, t, i, j, f;
int c = 219;
System.out.println("Menggambar Zigzag");
System.out.print("l :" );
l = Integer.parseInt(System.console(). readLine());
System.out.print("t :" );
t = Integer.parseInt(System.console(). readLine());
System.out.println ();
for(i = 1; i <= t; i++) {
System.out.print("\t");
if(i > 1 && i < t) {
for(j = 1; j <= l; j++) {
if(j % 2 == 1) {
System.out.print((char)c);
} else {
System.out.print(" ");
}
}
} else {
if(i == 1) {
f = 2;
} else {
f = 4;
}
for(j = 1; j <= l; j++) {
if(j == f){
System.out.print(" ");
f+=4;
} else {
System.out.print((char)c);
}
}
System.out.println ();
}}}
18.18
NonieUnic
