Java. Fundamentals. LoopsЦиклы. Циклы С предусловием Циклы С постусловием Со счетчиком. - презентация

1 Java. Fundamentals. LoopsЦиклы

2 Циклы С предусловием Циклы С постусловием Со счетчиком

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4 Цикл с предусловием while

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7 public class SumNumbers { int n=100; public SumNumbers(int n) { this.n = n; int i=1, sum=0, p=1; while(i<=this.n){ sum+=i; p*=i; System.out.println("Summa of numbers="+sum); System.out.println("Proizvedenie of numbers=" + p); i++; } System.out.println("Summa of numbers="+sum); System.out.println("Proizvedenie of numbers=" + p); } public static void main(String[] args){ int n=args.length; if(n==0)return; SumNumbers sumNumbers=new SumNumbers(Integer.parseInt(args[0])); } } public class SumNumbers { int n=100; public SumNumbers(int n) { this.n = n; int i=1, sum=0, p=1; while(i<=this.n){ sum+=i; p*=i; System.out.println("Summa of numbers="+sum); System.out.println("Proizvedenie of numbers=" + p); i++; } System.out.println("Summa of numbers="+sum); System.out.println("Proizvedenie of numbers=" + p); } public static void main(String[] args){ int n=args.length; if(n==0)return; SumNumbers sumNumbers=new SumNumbers(Integer.parseInt(args[0])); } }

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11 Цикл с постусловием

12 Цикл do-while

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18 public class SumDigitsOfNumber { public static void main(String args[]){ int a, a1, n=124, s=0; do{ a=n % 10; a1=n / 10; System.out.println("a="+a); s=s+a; System.out.println("s="+s); n=n/10; } while(n>0); System.out.print("Sum = "+s); }//end of main } public class SumDigitsOfNumber { public static void main(String args[]){ int a, a1, n=124, s=0; do{ a=n % 10; a1=n / 10; System.out.println("a="+a); s=s+a; System.out.println("s="+s); n=n/10; } while(n>0); System.out.print("Sum = "+s); }//end of main }

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20 Printing Numbers class DoWhile { class DoWhile { public static void main(String args[]) { public static void main(String args[]) { int n = 5; int n = 5; do { do { System.out.println("Sample : " + n); System.out.println("Sample : " + n); n--; n--; }while(n > 0); }while(n > 0); } Output : Output : Sample : 5 Sample : 5 Sample : 4 Sample : 4 Sample : 3 Sample : 3 Sample : 2 Sample : 2 Sample : 1 Sample : 1 Sample : 0 Sample : 0 0); }while(n > 0); } Output : Output : Sample : 5 Sample : 5 Sample : 4 Sample : 4 Sample : 3 Sample : 3 Sample : 2 Sample : 2 Sample : 1 Sample : 1 Sample : 0 Sample : 0">

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22 Цикл «for»(со счетчиком)

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24 for(g = 0, h = 1; g < 6; ++g) for(g = 0, h = 1; g < 6; ++g) for(g = 0; g 1; ++g, h--) for(g = 0; g 1; ++g, h--) for(g = 5; g >= 1; --g) for(g = 5; g >= 1; --g) for(g = 0; g < 10; ++g, ++h, sum += g) for(g = 0; g < 10; ++g, ++h, sum += g) for(; x < 10; ++x) for(; x < 10; ++x) for(; ; ) for(; ; ) for-each for(int i: myArray){} for (тип итерационная_переменная: коллекция) { блок операторов; } for(type var : collection) {statement-block }

25 int[] nums = { 3, 1, 6, 4, 9, 5, 8, 2 }; int[] nums = { 3, 1, 6, 4, 9, 5, 8, 2 }; int val = 5; int val = 5; boolean found = false; // ищем значение 5 в массиве boolean found = false; // ищем значение 5 в массиве for (int x : nums) for (int x : nums) { if (x == val) { if (x == val) { found = true; found = true; break; } break; } } if (found) { textInfo.setText("Значение найдено"); } if (found) { textInfo.setText("Значение найдено"); }

26 class prog_14 { class prog_14 { public static void main(String args[]){ public static void main(String args[]){ int numb[]={1,2,3,4,5}; int numb[]={1,2,3,4,5}; int summa=0; int summa=0; for(int i : numb){ for(int i : numb){ summa+=numb[i]; summa+=numb[i]; } System.out.println("Сумма="+summa); System.out.println("Сумма="+summa); } }

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44 import javax.swing.*; import java.awt.*; import java.util.Random; public class RandomCircles extends JPanel{ String ans; int count; Color randomColor; int R,G, B; public RandomCircles() { ans = JOptionPane.showInputDialog("Enter the number of circles"); count= Integer.valueOf(ans); int i=0; repaint(); } public void paintComponent(Graphics page) // public void paint(Graphics page) { Random generator = new Random(); int x, y, diameter; for(int i = 0; i < count; i++) { //loop that takes the count and does this "x" times R = (int) (Math.random( )*256); G = (int) (Math.random( )*256); B= (int)(Math.random( )*256); randomColor = new Color(R, G, B); page.setColor(randomColor);//sets color to blue x = generator.nextInt(90);//random location for x y = generator.nextInt(90);//random location for y diameter = generator.nextInt(30);//random size page.fillOval(x, y, diameter, diameter);//draws the circle } } } import javax.swing.*; import java.awt.*; import java.util.Random; public class RandomCircles extends JPanel{ String ans; int count; Color randomColor; int R,G, B; public RandomCircles() { ans = JOptionPane.showInputDialog("Enter the number of circles"); count= Integer.valueOf(ans); int i=0; repaint(); } public void paintComponent(Graphics page) // public void paint(Graphics page) { Random generator = new Random(); int x, y, diameter; for(int i = 0; i < count; i++) { //loop that takes the count and does this "x" times R = (int) (Math.random( )*256); G = (int) (Math.random( )*256); B= (int)(Math.random( )*256); randomColor = new Color(R, G, B); page.setColor(randomColor);//sets color to blue x = generator.nextInt(90);//random location for x y = generator.nextInt(90);//random location for y diameter = generator.nextInt(30);//random size page.fillOval(x, y, diameter, diameter);//draws the circle } } }

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