Java Functions

Func1.java

public class Func1 {

    public static void showArray (int[] a){
        for (int i = 0; i < a.length; i++) {
            System.out.println(a[i]);
        }
    }

    public static void main(String[] args) {
        int[] arr = {3, 8, 213, 23, 34};
        showArray(arr);
    }
}

Func2.java

public class Func2 {

    public static int sum (int a, int b){
        return a + b;
    }

    public static void main(String[] args) {
        System.out.println(sum(3,5));

        int p = 4, q = 7;

        int c = sum(p,q);

        System.out.println(c);
    }
}

Func3.java

public class Func3 {

    public static void fillFirstTwoElement (int[] a) {
        a[0] = 5;
        a[1] = 10;
    }

    public static void fillArrayNumbersOfElements (int[] array) {
        for (int i = 0; i < array.length; i++) {
            array[i] = i;
        }
    }

    public static void printArray(int[] arr) {
        for (int i = 0; i < arr.length; i++) {
            if(i != arr.length-1) {
                System.out.print(arr[i] + ", ");
            } else {
                System.out.print(arr[i]);
            }
        }
        System.out.println();
    }

    public static void main(String[] args) {
        int[] a = new int[5];

        int[] b = new int[2];

        fillArrayNumbersOfElements(a);
        printArray(a);

        fillFirstTwoElement(a);
        printArray(a);

        b[1] = 13;
        printArray(b);

        fillFirstTwoElement(b);
        printArray(b);

        
    }
}

HomeWork2_1_4_Denis.java

import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String sign;
        while(true) {
            System.out.print("Input first number: ");
            int first = sc.nextInt();
            System.out.print("Input second number: ");
            int second = sc.nextInt();
            System.out.print("Input method (+,-,*,/): ");
            sign = sc.next();
            switch (sign) {
                case "*": 
                    System.out.println("Result is " + (first * second)+"\n");
                    continue;
                
                case "+": 
                    System.out.println("Result is " + (first + second)+"\n");
                    continue;
                
                case "-": 
                    System.out.println("Result is " + (first - second)+"\n");
                    continue;
                
                case "/": 
                    System.out.println("Result is " + (first / second)+"\n");
                    continue;
                
                default:
                    System.out.println("Invalid operation! Try again.\n");
            }
        }
    }
}

HomeWork2_1_7_Sergiy.java

import java.util.Scanner;

public class Les1 {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);

    System.out.println("Введите число: ");
    int i = sc.nextInt();
    int k = 0, s = 0, q = 0;

    while (k < i)
    {
        if (q < s)
        {
            k++;
            System.out.print(k + " " + "\t");
            q++;
        }
        else
        {
            System.out.println();
            q = 0;
            s++;
        }
    }
  }
}