Lab08 CSE110_JAVA.txt

Classwork############################################################################


Task01-------------------------------------------------------------


import java.util.Scanner;

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

        System.out.println("Enter N:");
        int N = scanner.nextInt();
        int[ ] a1= new int [N];
        int[ ] a2= new int [N+1];
        String result = "After resizing the array: \n";
        
        for (int i=0; i<N; i++) {
          System.out.println("Enter a number: ");
          int num = scanner.nextInt();
          a1[i] = num;
          a2 [i] = num;
        }
        
        System.out.println("Enter another number: ");
        int num2 = scanner.nextInt();
        a2[N]=num2;
        
        System.out.println("The elements of the array are:");
        for (int i=0; i<a1.length; i++) {
          System.out.println(i+": "+a1[i]);
          result= result + a2[i]+" ";
        }
        result+=a2[N];

        scanner.close();
        System.out.println(result);
      

    }
}





Task02--------------------------------------------------------


import java.util.Arrays;

public class Name {
    public static void main(String[] args) {
        int[] arr = {9, -5, 7, 9, -5, 5, 7};


        System.out.println("Before removing duplicates:");
        for (int i = 0; i < arr.length; i++) {
            System.out.print(arr[i] + " ");
        }
        System.out.println();
        int count=0;

        // Replace duplicates with 0
        for (int i = 0; i < arr.length ; i++) {
            for (int j = 0; j <i; j++) {
                if (arr[i] == arr[j]) {
                    count++;
                }
            }
            if (count>0) {
              arr[i]=0;
              count=0;
            }
        }

        System.out.println("After replacing duplicates with 0:");
        for (int i = 0; i < arr.length; i++) {
            System.out.print(arr[i] + " ");
        }
        
        
    }
}




Special@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@

--------a number can not occur more than 3-times in array-------



public class Name {
    public static void main(String[] args) {
        int[] arr = {9, -5, 7, 9, -5, 9, -5, 9, 7, 7, 5, 9, 5, 7};

        System.out.println("Before removing duplicates:");
        for (int i = 0; i < arr.length; i++) {
            System.out.print(arr[i] + " ");
        }
        System.out.println();

        // Replace duplicates with 0 after the second occurrence
        for (int i = 0; i < arr.length; i++) {
            int count = 0;
            for (int j = 0; j < i; j++) {
                if (arr[i] == arr[j]) {
                    count++;
                    if (count >= 3) {
                        arr[i] = 0;
                    }
                }
            }
        }

        System.out.println("After replacing duplicates with 0:");
        for (int i = 0; i < arr.length; i++) {
            System.out.print(arr[i] + " ");
        }
    }
}


Alter

public class Name {
    public static void main(String[] args) {
        int[] arr = {9, -5, 7, 9, -5, 9, -5, 9, 7, 7, 5, 9, 5, 7};

        System.out.println("Before removing duplicates:");
        for (int i = 0; i < arr.length; i++) {
            System.out.print(arr[i] + " ");
        }
        System.out.println();

        // Replace duplicates with 0 after the second occurrence
        for (int i = 0; i < arr.length; i++) {
            int count = 0;
            for (int j = 0; j < arr.length; j++) {
                if (arr[i] == arr[j]) {
                    count++;
                    if (count > 3) {
                        arr[j] = 0;
                    }
                }
            }
        }

        System.out.println("After replacing duplicates with 0:");
        for (int i = 0; i < arr.length; i++) {
            System.out.print(arr[i] + " ");
        }
    }
}




Task03(a)----------------------------------------------------------------



import java.util.Scanner;

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

        System.out.println("Enter the length of the array:");
        int length = scanner.nextInt();

        int[] originalArray = new int[length];

        // Taking inputs from the user to fill the array
        for (int i = 0; i < length; i++) {
            System.out.print("Enter a number: ");
            originalArray[i] = scanner.nextInt();
        }

        // Reversing the array by creating a new array
        int[] reversedArray = new int[length];
        for (int i = 0; i < length; i++) {
            reversedArray[i] = originalArray[length - 1 - i];
        }

        // Printing the reversed array
        System.out.println("Reversed using a new array:");
        for (int i = 0; i < length; i++) {
            System.out.print(reversedArray[i] + " ");
        }

        scanner.close();
    }
}





Task03(b)-----------------------------------------------------------------


import java.util.Scanner;

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

        // Asking for the length of the array
        System.out.print("Enter the length of the array: ");
        int length = scanner.nextInt();

        // Creating an array of the specified length
        int[] array = new int[length];

        // Populating the array with user inputs
        System.out.println("Enter " + length + " integers:");
        for (int i = 0; i < length; i++) {
            array[i] = scanner.nextInt();
        }

        // Reversing the array in-place
        for (int i = 0; i < length / 2; i++) {
            // Swap array[i] with array[length - 1 - i]
            int temp = array[i];
            array[i] = array[length - 1 - i];
            array[length - 1 - i] = temp;
        }

        // Printing the reversed array
        System.out.println("Reversed array:");
        for (int i = 0; i < length; i++) {
            System.out.print(array[i] + " ");
        }
    }
}



Evaluation##############################################################################



Task01---------------------------------------------------------------------------\



import java.util.Scanner;

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

        // Input for the length of the array
        System.out.print("Enter the length of the array: ");
        int N = scanner.nextInt();

        // Create and populate the array
        int[] arr = new int[N];
        System.out.println("Enter the elements of the array:");
        for (int i = 0; i < N; i++) {
            arr[i] = scanner.nextInt();
        }

        // Modify and print the array
        System.out.println("Original array:");
        for (int i=0; i<N;i++) {
            System.out.print(arr[i] + " ");
        }
        System.out.println();

        System.out.println("Modified array:");
        for (int i = 0; i < N; i++) {
            if (arr[i] > 0) {
                arr[i] = 1;
            } else if (arr[i] < 0) {
                arr[i] = 0;
            }

        }
        for (int i=0; i<N;i++) {
          System.out.print(arr[i] + " ");
        }

        scanner.close();
    }
}





Task02--------------------------------------------------------------------




import java.util.Scanner;

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

        // Input for the length of the array
        System.out.print("Enter the length of the array: ");
        int N = scanner.nextInt();

        // Create and populate the array
        int[] arr = new int[N];
        System.out.println("Enter " + N + " numbers:");
        for (int i = 0; i < N; i++) {
            arr[i] = scanner.nextInt();
        }

        // Input the number to search
        System.out.print("Enter another number for check: ");
        int numToFind = scanner.nextInt();

        // Search for the number and print its index if found
        boolean found = false;
        int first_index=0;
        for (int i = 0; i < N; i++) {
            if (arr[i] == numToFind) {
              first_index=i;
                found = true;
                break;
            }
        }

        // If the number is not found, print 'Element not found'
        if (!found) {
            System.out.println("Element not found");
        }
        else {
          System.out.println(numToFind + " is at index " + first_index);
        }

        scanner.close();
    }
}

Homework################################################################################



import java.util.Scanner;

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

        System.out.println("Enter the length of the array:");
        int length = scanner.nextInt();

        double[] array = new double[length];

        // Taking inputs from the user to fill the array
        for (int i = 0; i < length; i++) {
            System.out.print("Enter a number: ");
            array[i] = scanner.nextDouble();
        }

        // Finding maximum element, minimum element, and calculating summation
        double max = array[0];
        double min = array[0];
        double sum = array[0];
        int m=0;
        int n=0;
        for (int i = 1; i < length; i++) {
            if (array[i] > max) {
                max = array[i];
                m=i;
            }
            if (array[i] < min) {
                min = array[i];
                n=i;
            }
            sum += array[i];
        }

        System.out.println("Maximum element " + max + " found at index "+m);
        System.out.println("Minimum element " + min + " found at index "+n);
        System.out.println("Summation: " + sum);
        System.out.println("Average: " + (float) (sum / length));

        scanner.close();
    }
}




Task02------------------------------------------------------------------


public class Name {
    public static void main(String[] args) {
        int arr [] = {-5,10,-7,-5};

        System.out.println("Input array:");
        for (int i = 0; i < arr.length; i++) {
            System.out.print(arr[i] + " ");
        }
        System.out.println();

        // Counting the number of unique elements
        int count = 0;
        int[] garbage = new int[arr.length];

        // Checking uniqueness and filling the unique array
        for (int i = 0; i < arr.length; i++) {
            boolean isUnique = true;
            for (int j = 0; j < i; j++) {
                if (arr[i] == arr[j]) {
                    isUnique = false;
                    break;
                }
            }
            if (isUnique) {
                garbage[count++] = arr[i];
            }
        }
        int[] newarr = new int[count];
        for (int i=0; i<count;i++) {
          newarr[i]=garbage[i];
        }

        // Printing the new array containing unique elements
        System.out.println("New array:");
        for (int i = 0; i < newarr.length; i++) {
            System.out.print(newarr[i] + " ");
        }
    }
}





Task03---------------------------------------------------------------------



import java.util.Scanner;

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

        // Input for the first array
        System.out.print("Please enter the length of array 1: ");
        int n1 = scanner.nextInt();
        int[] arr1 = new int[n1];
        System.out.println("Please enter the elements of the arr1:");
        for (int i = 0; i < n1; i++) {
            arr1[i] = scanner.nextInt();
        }

        // Input for the second array
        System.out.print("Please enter the length of array 2: ");
        int n2 = scanner.nextInt();
        int[] arr2 = new int[n2];
        System.out.println("Please enter the elements of the arr2:");
        for (int i = 0; i < n2; i++) {
            arr2[i] = scanner.nextInt();
        }

        // Check if arr2 is a subset of arr1
        boolean isSubset = true;
        for (int i = 0; i < arr2.length; i++) {
            boolean found = false;
            for (int j = 0; j < arr1.length; j++) {
                if (arr2[i] == arr1[j]) {
                    found = true;
                    break;
                }
            }
            if (!found) {
                isSubset = false;
                break;
            }
        }

        // Output the result
        if (isSubset) {
            System.out.println("Array 2 is a subset of Array 1.");
        } else {
            System.out.println("Array 2 is not a subset of Array 1.");
        }

        scanner.close();
    }
}






Task04---------------------------------------------------------------------




import java.util.Scanner;

public class Name{
    public static void main(String[] args) {
      int arr [] = {3, 8, 5, 4, 1};                          // You have to take Input
      int target = 9;
      String result1= "Elements need to be added: ";
      String result2 = "\nIndex of the elements: ";
      boolean file= false;
      boolean found = false;
      for (int i=0; i<arr.length; i++) {
        for (int j=0; j<arr.length; j++) {
          if ( ( arr[i]+arr[j] ) == target && arr[i] != arr[j]) {
            result1= result1 + arr[i] + " " + arr[j];
            result2= result2 + i +" and "+j;
            file = true;
            found= true;
            break;
          }
        }
        if (found) {
          break;
        }
      }
      if (file) {
        System.out.print(result1+result2);
        
      }
      else {
        System.out.println("Target value not found");
      }
      
      
      
    }
}







Task05----------------------------------------------------------------------



import java.util.Scanner;

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

        // Input for the length of the array
        System.out.print("Enter the length of the array: ");
        int N = scanner.nextInt();

        // Create and populate the array
        int[] arr = new int[N];
        System.out.println("Enter " + N + " numbers:");
        for (int i = 0; i < N; i++) {
            arr[i] = scanner.nextInt();
        }

        // Print the original array
        System.out.println("Original Array:");
        for (int i = 0; i < N; i++) {
            System.out.print(arr[i] + " ");
        }
        System.out.println();

        // Sort the array in descending order using Selection Sort
        for (int i = 0; i < N - 1; i++) {
            int maxIndex = i;
            for (int j = i + 1; j < N; j++) {
                if (arr[j] > arr[maxIndex]) {
                    maxIndex = j;
                }
            }
            // Swap arr[i] with the maximum element
            int temp = arr[i];
            arr[i] = arr[maxIndex];
            arr[maxIndex] = temp;
        }

        // Print the sorted array
        System.out.println("Sorted Array:");
        for (int i = 0; i < N; i++) {
            System.out.print(arr[i] + " ");
        }
        System.out.println();

        scanner.close();
    }
}







Task06------------------------------------------------------------------------



public class Name {
    public static void main(String[] args) {
        int[] marks = {85, 90, 75, 44, 99};
        String[] names = {"Bob", "Alice", "Max", "Marry", "Rosy"};

        // Bubble sort to sort the marks array
        int n = marks.length;
        for (int i = 0; i < n - 1; i++) {
            for (int j = 0; j < n - i - 1; j++) {
                if (marks[j] > marks[j + 1]) {
                    // Swap marks
                    int tempMark = marks[j];
                    marks[j] = marks[j + 1];
                    marks[j + 1] = tempMark;
                    
                    // Swap names
                    String tempName = names[j];
                    names[j] = names[j + 1];
                    names[j + 1] = tempName;
                }
            }
        }

        // Print the sorted array
        System.out.println("Sorted Array:");
        for (int mark : marks) {
            System.out.print(mark + " ");
        }
        System.out.println();
        
        // Print corresponding names
        for (String name : names) {
            System.out.print(name + " ");
        }
        System.out.println();
    }
}