data_type[ ] array_name = new data_type[array_size];

array_name[index] = new_value;

public class Main {
    public static void main(String[] args) {
        int[ ] x = new int[5];
        x[0] = 10;
        x[1] = 20;
        System.out.println(x[0]);
        x[2] = 30;
        x[3] = 40;
        x[4] = 50;
    }
}

2. x[0] = 10;

3. x[1] = 20;

4. System.out.println(x[0]);

5. x[2] = 30;, x[3] = 40;, and x[4] = 50;

public class Main {
    public static void main(String[] args) {
        int[ ] x = new int[5];
        x[0] = 10;
        x[1] = 5;
        x[4] = x[0] + x[1];
        System.out.println(x[4]);
    }
}

15

public class Main {
    public static void main(String[] args) {
        final int t = 5;
        int[  ] x = new int[t];
    }
}

public class Main {
    public static void main(String[ ] args) {
        int[] x = {1, 4, 8, 7, 2};
        System.out.println(x[0]);
    }
}

public class Main {
    public static void main(String[] args) {
        int[ ] x = new int[5];
        System.out.println(x[3]);
    }
}

public class Main {
    public static void main(String[] args) {
        int[ ] x = new int[5];
        x[0] = 0;
        System.out.println(x[3]);
    }
}

public class Main {
    public static void main(String[] args) {
        int[] x = {1, 2, 3};
        System.out.println(x[3]);
    }
}

Write a java program to calculate your birth year from your age?

import java.util.Scanner;

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

//ادخل عمرك
        System.out.print("Enter your age =  ");
        int age = in.nextInt();

        int year = 2024;
        //    احسب سنة الميلاد
        int birthYear = year - age;

        //عرض سنة الميلاد
        System.out.println("Your birth year =  " + birthYear);
    }
}

mport java.util.Scanner;

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

 
        System.out.print("Enter the num1 : ");
        int num1 = in.nextInt();

        System.out.print("Enter the  num2 : ");
        int num2 = in.nextInt();

        System.out.print("Enter the  num3 : ");
        int num3 = in.nextInt();

     
        int greatest = num1;

        if (num2 > greatest) {
            greatest = num2;
        }


        if (num3 > greatest) {
            greatest = num3;
        }

import java.util.Scanner;

public class main {

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

        double quiz;
        double midTerm;
        double finalScore;

       
        while (true) {
            System.out.print("Enter quiz score (0-100): ");
            quiz = scanner.nextDouble();
            if (quiz >= 0 && quiz <= 100) {
                break;
            } else {
                System.out.println("Invalid score. Please enter a value between 0 and 100.");
            }
        }

        
        while (true) {
            System.out.print("Enter mid-term score (0-100): ");
            midTerm = scanner.nextDouble();
            if (midTerm >= 0 && midTerm <= 100) {
                break;
            } else {
                System.out.println("Invalid score. Please enter a value between 0 and 100.");
            }
        }

        
        while (true) {
            System.out.print("Enter final score (0-100): ");
            finalScore = scanner.nextDouble();
            if (finalScore >= 0 && finalScore <= 100) {
                break;
            } else {
                System.out.println("Invalid score. Please enter a value between 0 and 100.");
            }
        }

        
        double averageScore = (quiz + midTerm + finalScore) / 3;

        
        if (averageScore >= 90) {
            System.out.println("Grade: A");
        } else if (averageScore >= 70) {
            System.out.println("Grade: B");
        } else if (averageScore >= 50) {
            System.out.println("Grade: C");
        } else {
            System.out.println("Grade: F");
        }

        scanner.close();
    }

public class main {
    public static void main(String[] args) {
        for (int i = 1; i <= 5; i++) {
            for (int j = 1; j <= 2 * i - 1; j++) {
                System.out.print("*");
            }
            System.out.println();
        }
    }
}

import java.util.Scanner;


public class main {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        System.out.println("Enter positive numbers (enter a non-positive to stop):");

        while (true) {
            int number = input.nextInt();
            if (number <= 0) {
                System.out.println("Terminated.");
                break;
            }
        }
    }
}

public class main {
    public static void main(String[] args) {
        int term = 1;
        for (int i = 0; i < 10; i++) {
            System.out.print(term + " ");
            term = term * 2 + 1;
        }
    }
}

سؤال المختبر القادم للهياكل /علوم صباحي
//
اكتب برنامج يقرء مصفوفه احاديه مصفوفة ثنائيه ثم يطلب من المستخدم اختيار نوع المصفوفه ووحجم المصفوفه وعناصر المجموعه ثم طباعتها واجراء 5 عمليات عليها ويبقى يطلب من المستخدم اجراء عمليات لحين طلب المستخدم الخروج من العمليات

import java.util.Scanner;
public class hmd {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        boolean exit = false;

        while (!exit) {
            System.out.println("اختر نوع المصفوفة: 1. أحادية 2. ثنائية 3. ثلاثية 4. خروج");
            int choice = scanner.nextInt();

            switch (choice) {
                case 1:
                    // مصفوفة أحادية
                    System.out.println("أدخل عدد العناصر في المصفوفة الأحادية:");
                    int size = scanner.nextInt();
                    int[] array = new int[size];
                    System.out.println("أدخل العناصر:");
                    for (int i = 0; i < size; i++) {
                        array[i] = scanner.nextInt();
                    }
                    printArray(array); // طباعة المصفوفة
                    arrayD1(array);
                    break;

                case 2:
                    // مصفوفة ثنائية
                    System.out.println("أدخل عدد الصفوف:");
                    int rows = scanner.nextInt();
                    System.out.println("أدخل عدد الأعمدة:");
                    int cols = scanner.nextInt();
                    int[][] matrix = new int[rows][cols];
                    System.out.println("أدخل العناصر:");
                    for (int i = 0; i < rows; i++) {
                        for (int j = 0; j < cols; j++) {
                            matrix[i][j] = scanner.nextInt();
                        }
                    }
                    printArray(matrix); // طباعة المصفوفة
                    arrayD2(matrix);
                    break;

                case 3:
                    // مصفوفة ثلاثية
                    System.out.println("أدخل عدد الطبقات:");
                    int layers = scanner.nextInt();
                    System.out.println("أدخل عدد الصفوف:");
                    int threesRows = scanner.nextInt();
                    System.out.println("أدخل عدد الأعمدة:");
                    int threesCols = scanner.nextInt();
                    int[][][] threeDMatrix = new int[layers][threesRows][threesCols];
                    System.out.println("أدخل العناصر:");
                    for (int i = 0; i < layers; i++) {
                        for (int j = 0; j < threesRows; j++) {
                            for (int k = 0; k < threesCols; k++) {
                                threeDMatrix[i][j][k] = scanner.nextInt();
                            }
                        }
                    }

                    break;

                case 4:
                    exit = true;
                    System.out.println("تم الخروج من البرنامج.");
                    break;

                default:
                    System.out.println("اختيار غير صالح.");
            }
        }

        scanner.close();
    }

    // عمليات على المصفوفة الأحادية
    private static void  arrayD1 (int[] array) {
        boolean backToMenu = false;

        while (!backToMenu) {
            printArray( array);
            System.out.println("اختر عملية:");
            System.out.println("1. حساب مجموع العناصر");
            System.out.println("2. حساب متوسط العناصر");
            System.out.println("3. العثور على أكبر عنصر");
            System.out.println("4. العثور على أصغر عنصر");
            System.out.println("5. عكس المصفوفة");
            System.out.println("6. العودة إلى القائمة الرئيسية");

int operation = new Scanner(System.in).nextInt();
            switch (operation) {
                case 1:
                    System.out.println("مجموع العناصر: " + sum(array));
                    break;
                case 2:
                    System.out.println("متوسط العناصر: " + average(array));
                    break;
                case 3:
                    System.out.println("أكبر عنصر: " + max(array));
                    break;
                case 4:
                    System.out.println("أصغر عنصر: " + min(array));
                    break;
                case 5:
                    reverseArray(array);
                    break;
                case 6:
                    backToMenu = true;
                    break;
                default:
                    System.out.println("اختيار غير صالح! يرجى إدخال رقم من 1 إلى 6.");
            }
        }
    }

    // عمليات على المصفوفة الثنائية
    private static void arrayD2(int[][] matrix) {
        boolean backToMenu = false;

        while (!backToMenu) {
            printArray(matrix);
            System.out.println("اختر عملية:");
            System.out.println("1. حساب مجموع العناصر");
            System.out.println("2. حساب متوسط العناصر");
            System.out.println("3. العثور على أكبر عنصر");
            System.out.println("4. العثور على أصغر عنصر");
            System.out.println("5. عكس المصفوفة");
            System.out.println("6. العودة إلى القائمة الرئيسية");

            int operation = new Scanner(System.in).nextInt();
            switch (operation) {
                case 1:
                    System.out.println("مجموع العناصر: " + sum(matrix));
                    break;
                case 2:
                    System.out.println("متوسط العناصر: " + average(matrix));
                    break;
                case 3:
                    System.out.println("أكبر عنصر: " + max(matrix));
                    break;
                case 4:
                    System.out.println("أصغر عنصر: " + min(matrix));
                    break;
                case 5:
                    reverseMatrix(matrix);
                    break;
                case 6:
                    backToMenu = true;
                    break;
                default:
                    System.out.println("اختيار غير صالح! يرجى إدخال رقم من 1 إلى 6.");
            }
        }
    }


    // دالة لعكس المصفوفة الأحادية
    private static void reverseArray(int[] array) {
        int n = array.length;
        for (int i = 0; i < n / 2; i++) {
            int temp = array[i];
            array[i] = array[n - i - 1];
            array[n - i - 1] = temp;
        }
        System.out.println("المصفوفة بعد العكس:");
        printArray(array);
    }

    // دالة لعكس المصفوفة الثنائية
    private static void reverseMatrix(int[][] matrix) {
        for (int i = 0; i < matrix.length; i++) {
            reverseArray(matrix[i]);
        }
        System.out.println("المصفوفة الثنائية بعد العكس:");
        printArray(matrix);
    }



    private static int sum(int[] array) {
        int total = 0;
        for (int i = 0; i < array.length; i++) {
            total += array[i];
        }
        return total;
    }

    private static double average(int[] array) {
        return (double) sum(array) / array.length;
    }

    private static int max(int[] array) {
        int max = array[0];
        for (int i = 0; i < array.length; i++) {
            if (array[i] > max) {
                max = array[i];
            }
        }
        return max;
    }

    private static int min(int[] array) {
        int min = array[0];
        for (int i = 0; i < array.length; i++) {
            if (array[i] < min) {
                min = array[i];
            }
        }
        return min;
    }

    private static int sum(int[][] matrix) {
        int total = 0;
        for (int i = 0; i < matrix.length; i++) {
            total += sum(matrix[i]); // استخدام دالة sum للمصفوفة الأحادية
        }
        return total;
    }

private static double average(int[][] matrix) {
        return (double) sum(matrix) / (matrix.length * matrix[0].length);
    }

    private static int max(int[][] matrix) {
        int max = matrix[0][0];
        for (int i = 0; i < matrix.length; i++) {
            for (int j = 0; j < matrix[i].length; j++) {
                if (matrix[i][j] > max) {
                    max = matrix[i][j];
                }
            }
        }
        return max;
    }

    private static int min(int[][] matrix) {
        int min = matrix[0][0];
        for (int i = 0; i < matrix.length; i++) {
            for (int j = 0; j < matrix[i].length; j++) {
                if (matrix[i][j] < min) {
                    min = matrix[i][j];
                }
            }
        }
        return min;
    }



    private static void printArray(int[] array) {
        System.out.println("عناصر المصفوفة الأحادية:");
        for (int i : array) {
            System.out.print(i + " ");
        }
        System.out.println();
    }

    private static void printArray(int[][] matrix) {
        System.out.println("عناصر المصفوفة الثنائية:");
        for (int[] row : matrix) {
            for (int j : row) {
                System.out.print(j + " ");
            }
            System.out.println();
        }
    }


    }

الكود الاخذناه بالعملي
import java.util.Scanner;

public class App {
    
   public static Scanner read=new Scanner(System.in);
    public static void main(String[] args) {
       
        System.out.println("enter a&b:");
int a= read.nextInt();
int b=read.nextInt();
int c=multi(a,b);
output(c);
read.close();
     }
     public static int multi (int a,int b) {




        
        int multi =a*b;
        return multi;
     }
     public static void output (int c) {
System.out.println("the multi: "+c);

     }
}

import java.util.Scanner;

public class hh {

        public static void main(String[] args) {
            Scanner scanner = new Scanner(System.in);
            System.out.print("Enter    N : ");
            int N = scanner.nextInt();
            int largest = 0;

            for (int i = 0; i < N; i++) {
                System.out.print("Enter num" + (i + 1) + ": ");
                int num = scanner.nextInt();
                if (num > largest) {
                    largest = num;
                }
            }
            System.out.println("Largest number: " + largest);

        }
    }

import java.util.Scanner;

public class hh {

        public static void main(String[] args) {
            Scanner scanner = new Scanner(System.in);
            System.out.print("Enter the number of integers (N): ");
            int N = scanner.nextInt();

            for (int i = 0; i < N; i++) {
                System.out.print("Enter number " + (i + 1) + "= ");
                int num = scanner.nextInt();
                if (num > 0) {
                    System.out.println(num + " is positive.");
                } else if (num < 0) {
                    System.out.println(num + " is negative.");
                } else {
                    System.out.println(num + " is zero.");
                }
            }
        }
    }

java
import java.util.Scanner;

public class hh {

 
        public static void main(String[] args) {
            Scanner scanner = new Scanner(System.in);
            System.out.print("Enter the number of characters (N): ");
            int N = scanner.nextInt();

            for (int i = 0; i < N; i++) {
                System.out.print("Enter character " + (i + 1) + ": ");
                char ch = scanner.next().charAt(0);
                if (Character.isLetter(ch)) {
                    System.out.println(ch + " is an alphabet.");
                } else {
                    System.out.println(ch + " is not an alphabet.");
                }
            }
           
        }
    }

import java.util.Scanner;

public class hh {


        public static void main(String[] args) {
            Scanner scanner = new Scanner(System.in);
            System.out.print("Enter the number of characters (N): ");
            int N = scanner.nextInt();

            for (int i = 0; i < N; i++) {
                System.out.print("Enter character " + (i + 1) + ": ");
                char ch = scanner.next().charAt(0);
                if ("AEIOUaeiou".indexOf(ch) != -1) {
                    System.out.println(ch + " is a vowel.");
                } else if (Character.isLetter(ch)) {
                    System.out.println(ch + " is a consonant.");
                } else {
                    System.out.println(ch + " is not an alphabet.");
                }
            }
            
        }
    }

import java.util.Scanner;

public class hh {

        public static void main(String[] args) {
            Scanner scanner = new Scanner(System.in);
            System.out.print("Enter first integer: ");
            int firstNum = scanner.nextInt();
            System.out.print("Enter second integer: ");
            int secondNum = scanner.nextInt();
            System.out.print("Enter operation (+, -, *, /): ");
            char operation = scanner.next().charAt(0);

            switch (operation) {
                case '+':
                    System.out.println("Result: " + (firstNum + secondNum));
                    break;
                case '-':
                    System.out.println("Result: " + (firstNum - secondNum));
                    break;
                case '*':
                    System.out.println("Result: " + (firstNum * secondNum));
                    break;
                case '/':
                    if (secondNum != 0) {
                        System.out.println("Result: " + (firstNum / (double) secondNum));
                    } else {
                        System.out.println("Cannot divide by zero.");
                    }
                    break;
                default:
                    System.out.println("Invalid operation.");
            }
            scanner.close();
        }
    }

import java.util.Scanner;

public class hh {
 
        public static void main(String[] args) {
            Scanner scanner = new Scanner(System.in);
            System.out.print("Enter month number (1-12): ");
            int month = scanner.nextInt();
            int days;

            switch (month) {
                case 1: case 3: case 5: case 7: case 8: case 10: case 12:
                    days = 31;
                    break;
                case 4: case 6: case 9: case 11:
                    days = 30;
                    break;
                case 2:
                    days = 28; 
                    break;
                default:
                    days = 0;
            }

            if (days != 0) {
                System.out.println("Days in month: " + days);
            } else {
                System.out.println("Invalid month number.");
            }
             
        }
    }

import java.util.Scanner;

public class hh {
 
        public static void main(String[] args) {
            Scanner scanner = new Scanner(System.in);
            System.out.print("Enter the number of elements: ");
            int N = scanner.nextInt();
            int[] numbers = new int[N];

            System.out.println("Enter " + N + " numbers:");
            for (int i = 0; i < N; i++) {
                numbers[i] = scanner.nextInt();
            }

            System.out.print("Enter specific number to count: ");
            int specificNum = scanner.nextInt();
            int count = 0;

            for (int number : numbers) {
                if (number == specificNum) {
                    count++;
                }
            }
            System.out.println(specificNum + " appears " + count + " times.");
            
        }
    }

import java.util.Scanner;

public class hh {

         public static void main(String[] args) {
            Scanner scanner = new Scanner(System.in);
            System.out.print("Enter a maximum odd number (n): ");
            int nValue = scanner.nextInt();

            if (nValue % 2 == 1) {
                int sumOdd = 0;
                int oddCount = 0;

                System.out.print("Odd numbers between 1 and " + nValue + ": ");
                for (int i = 1; i <= nValue; i += 2) {
                    System.out.print(i + " ");
                    sumOdd += i;
                    oddCount++;
                }
                double average = oddCount > 0 ? (double) sumOdd / oddCount : 0;
                System.out.println("\nAverage of odd numbers: " + average);
            } else {
                System.out.println("Please enter an odd number.");
            }
            
        }
    }

import java.util.Scanner;

public class hh {
    public static void main(String[] args) {
        Scanner read = new Scanner(System.in);
        
        
        System.out.print("Enter N: ");
        int N = read.nextInt();
        System.out.print("Enter M: ");
        int M = read.nextInt();
        
        
        System.out.println("Even numbers between " + N + " and " + M + ":");
        for (int i = N; i <= M; i++) {
            if (i % 2 == 0) {
                System.out.println(i);
            }
        }
           }
}

import java.util.Scanner;

public class hh {
    public static void main(String[] args) {
        Scanner read = new Scanner(System.in);
        
         System.out.print("Enter student's average: ");
        double average = read.nextDouble();
        
       
        if (average > 90) {
            System.out.println("The student is eligible.");
        } else {
            System.out.println("The student is not eligible.");
        } 
    }
}