Perulangan pada Java

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 ();

}}}

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