เฉลย Lab 4 (OOT 58)

lab4_1 No1.java

package oot.lab4.group1.y58;

import java.util.Scanner;

public class No1 {

    public static int[] genArrayA(int size) {
        int[] a = new int[size];
        int n = 20;
        int i = 0;
        while (i < size) {
            if (n > 20 && n % 2 != 0) {
                a[i] = n;
                System.out.printf("%d ", a[i]);
                i++;
            }
            n++;
        }
        System.out.println();
        return a;
    }

    private static int[] genArrayB(int size) {
        int[] b = new int[size];
        int n = 10;
        int i = 0;
        while (i < size) {
            if (n > 10 && (n % 3 == 0 || n % 5 == 0)) {
                b[i] = n;
                System.out.printf("%d ", b[i]);
                i++;
            }
            n++;
        }
        System.out.println();
        return b;
    }

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.print("Enter size: ");
        int size = scanner.nextInt();
        int[] a = genArrayA(size);
        int[] b = genArrayB(size);

        System.out.println();
        System.out.print("Enter index: ");
        int index = scanner.nextInt();
        sub(a, b, index);
    }

    private static void sub(int[] a, int[] b, int index) {
        for (int i = 0; i < a.length; i++) {
            System.out.printf("%d ", a[i] - b[i]);
        }
        System.out.println();
        System.out.printf("a[%d] = %d\n", index, a[index]);
        System.out.printf("b[%d] = %d\n", index, b[index]);
        System.out.printf("a[%d] - b[%d] = %d\n", index, index, a[index] - b[index]);
    }

}

lab4_1 No2.java

package oot.lab4.group1.y58;

public class No2 {

    public static void main(String[] args) {
        int[][] a = {{9, 8, 7}, {6, 5, 4}, {3, 2, 1}};
        int[][] b = {{0, 1, 1}, {3, 2, 1}, {1, 3, 2}};
        System.out.println("Matrix A:");
        prtArr(a);
        System.out.println("Matrix B:");
        prtArr(b);
        int[][] c = plus(a, b);
        System.out.println("A + B:");
        prtArr(c);
    }

    private static void prtArr(int[][] a) {
        for (int i = 0; i < a.length; i++) {
            for (int j = 0; j < a.length; j++) {
                System.out.printf("%3d ", a[i][j]);
            }
            System.out.println();
        }
        System.out.println();
    }

    private static int[][] plus(int[][] a, int[][] b) {
        int[][] c = new int[a.length][a.length];
        for (int i = 0; i < a.length; i++) {
            for (int j = 0; j < a.length; j++) {
                c[i][j] = a[i][j] + b[i][j];
            }
        }
        return c;
    }

}

lab4_2 No1.java

package oot.lab4.group2.y58;

import java.util.Scanner;

public class No1 {

    public static int[] createA(int size) {
        int[] a = new int[size];
        int n = 19;
        int i = 0;
        while (i < size) {
            if (n > 20) {
                a[i] = n;
                System.out.printf("%2d ", a[i]);
                i++;
            }
            n++;
        }
        System.out.println();
        return a;
    }

    public static int[] createB(int size) {
        int[] b = new int[size];
        int n = 9;
        int i = 0;
        while (i < size) {
            if (n > 10 && n % 2 == 1) {
                b[i] = n;
                System.out.printf("%2d ", b[i]);
                i++;
            }
            n++;
        }
        System.out.println();
        return b;
    }

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.print("Enter size: ");
        int size = scanner.nextInt();
        int[] a = createA(size);
        int[] b = createB(size);
        System.out.println();
        System.out.print("Enter index: ");
        int idx = scanner.nextInt();
        minus(a, b, idx);
    }

    private static void minus(int[] a, int[] b, int idx) {
        System.out.printf("a[%d] = %d\n", idx, a[idx]);
        System.out.printf("b[%d] = %d\n", idx, b[idx]);
        System.out.printf("a[%d] - b[%d] = %d\n", idx, idx, a[idx] - b[idx]);
        System.out.println();
        System.out.println("a-b:");
        for (int i = 0; i < a.length; i++) {
            System.out.printf("%d ", a[i] - b[i]);
        }
    }

}

lab4_2 No2.java

package oot.lab4.group2.y58;

import java.util.Scanner;

public class No2 {

    public static void main(String[] args) {
        int[][] a = {{1, 2, 3}, {4, 5, 4}, {3, 2, 1}};
        int[][] b = {{9, 8, 7}, {6, 5, 4}, {3, 2, 1}};
        System.out.println("Matrix A:");
        show(a);
        System.out.println("Matrix B:");
        show(b);

        Scanner scanner = new Scanner(System.in);
        System.out.print("Enter x: ");
        int x = scanner.nextInt();
        for (int i = 0; i < a.length; i++) {
            for (int j = 0; j < a.length; j++) {
                a[i][j] += x;
            }
        }
        System.out.println("Matrix A:");
        show(a);

        int[][] c = sub(a, b);
        System.out.println("A - B:");
        show(c);
    }

    private static void show(int[][] a) {
        for (int i = 0; i < a.length; i++) {
            for (int j = 0; j < a.length; j++) {
                System.out.printf("%2d ", a[i][j]);
            }
            System.out.println();
        }
        System.out.println();
    }

    private static int[][] sub(int[][] a, int[][] b) {
        int[][] c = new int[a.length][a.length];
        for (int i = 0; i < a.length; i++) {
            for (int j = 0; j < a.length; j++) {
                c[i][j] = a[i][j] - b[i][j];
            }
        }
        return c;
    }

}

lab4_3 No1.java

package oot.lab4.group3.y58;

import java.util.Scanner;

public class No1 {

    public static int[] arrayA(int size) {
        int[] a = new int[size];
        int n = 10;
        int i = 0;
        while (i < size) {
            if (n > 10 && n % 7 == 0) {
                a[i] = n;
                System.out.printf("%3d ", a[i]);
                i++;
            }
            n++;
        }
        System.out.println();
        return a;
    }

    public static int[] arrayB(int size) {
        int[] b = new int[size];
        int n = 1;
        int i = 0;
        while (i < size) {
            b[i] = n;
            System.out.printf("%3d ", b[i]);
            i++;
            n++;
            if (n > 3) {
                n = 1;
            }
        }
        System.out.println();
        return b;
    }

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.print("Enter size: ");
        int size = scanner.nextInt();
        int[] a = arrayA(size);
        int[] b = arrayB(size);

        System.out.println();

        System.out.print("Enter index i: ");
        int i = scanner.nextInt();
        System.out.print("Enter index j: ");
        int j = scanner.nextInt();
        plus(a, b, i, j);
    }

    private static void plus(int[] a, int[] b, int i, int j) {
        for (int k = 0; k < a.length; k++) {
            System.out.printf("%d ", a[k] + b[k]);
        }
        System.out.println();
        System.out.printf("a[%d] = %d\n", i, a[i]);
        System.out.printf("b[%d] = %d\n", j, b[j]);
        System.out.printf("%d + %d = %d\n", a[i], b[j], a[i] + b[j]);
    }

}

lab4_3 No2.java

package oot.lab4.group3.y58;

import java.util.Scanner;

public class No2 {

    public static void main(String[] args) {
        int[][] a = {{19, 18, 17}, {16, 15, 14}, {17, 18, 19}};
        int[][] b = {{1, 2, 3}, {4, 5, 3}, {7, 8, 9}};
        System.out.println("Matrix A:");
        print(a);
        System.out.println("Matrix B:");
        print(b);

        System.out.println("== Set A[i][j] ==");
        Scanner scanner = new Scanner(System.in);
        System.out.print("Enter i: ");
        int i = scanner.nextInt();
        System.out.print("Enter j: ");
        int j = scanner.nextInt();
        System.out.print("Enter value: ");
        int value = scanner.nextInt();
        a[i][j] = value;

        System.out.println("Matrix A:");
        print(a);

        int[][] c = compute(a, b, value);
        System.out.println("(A - B)*value :");
        print(c);
    }

    private static void print(int[][] a) {
        for (int i = 0; i < a.length; i++) {
            for (int j = 0; j < a.length; j++) {
                System.out.printf("%3d ", a[i][j]);
            }
            System.out.println();
        }
        System.out.println();
    }

    private static int[][] compute(int[][] a, int[][] b, int value) {
        int[][] c = new int[a.length][a.length];
        for (int i = 0; i < a.length; i++) {
            for (int j = 0; j < a.length; j++) {
                c[i][j] = (a[i][j] - b[i][j]) * value;
            }
        }
        return c;
    }

}