Lab05 CSE110_JAVA.txt

Lab05 - CSE110_JAVA

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

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

class Main {
    public static void main(String[] args) {
        int N=5;
        int prime_count=0;
        int num =1;
    while (prime_count<N){
        int count = 0;
        for (int i=1; i<=num; i++){
            if (num%i==0){
                count++;
            }
        }
        if (count==2){
            prime_count++;
            System.out.println(num+" is a Prime number.");
        }
        num++;
    }
        
    }
}



Alter Task02-------------------


import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.print("Enter the number of prime numbers you want to print: ");
        int N = scanner.nextInt();
        scanner.close();

        int count = 0;
        int number = 2;

        while (count < N) {
            boolean isPrime = true;
            for (int i = 2; i <number; i++) {
                if (number % i == 0) {
                    isPrime = false;
                    break;
                }
            }
            if (isPrime) {
                System.out.println(number);
                count++;
            }
            number++;
        }
        
        
    }
}





Alter Task01 using both for loop--------------------------------------------------------------



import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.print("Enter the number of prime numbers you want to print: ");
        int N = scanner.nextInt();
        scanner.close();

        int number = 2;

        for (int count=0; count < N; number++) {
            boolean isPrime = true;
            for (int i = 2; i <number; i++) {
                if (number % i == 0) {
                    isPrime = false;
                    break;
                }
            }
            if (isPrime) {
                System.out.println(number);
                count++;
            }
        }
        
        
    }
}







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




import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.print("Enter the starting number: ");
        int start = scanner.nextInt();
        System.out.print("Enter the ending number: ");
        int end = scanner.nextInt();
        scanner.close();

        System.out.println("Armstrong numbers:");
        for (int number = start; number <= end; number++) {
            int originalNumber = number;
            int n = 0;
            int result = 0;

            // Count number of digits
            while (originalNumber != 0) {
                originalNumber /= 10;
                ++n;
            }

            originalNumber = number;

            // Calculate sum of nth power of individual digits
            while (originalNumber != 0) {
                int remainder = originalNumber % 10;
                result += Math.pow(remainder, n);
                originalNumber /= 10;
            }

            // Check if the number is Armstrong
            if (result == number) {
                System.out.println(number);
            }
        }
    }
}




Class Evaluation#######################################################################



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


import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        
        // Input range
        System.out.print("Enter number 'N': ");
        int N= scanner.nextInt();
        int sum=0;
        for (int i=1; i <=N; i++) {
          for (int j=1; j<=i; j++) {
            sum-=j;
          }
        }
        System.out.println("The value of y: "+sum);

        
        
        scanner.close();
    }
}




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




import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        
        // Input range
        while (true) {
          System.out.print("Enter number 'N': ");
          int N= scanner.nextInt();
          if (N%2==0) {
            int count=0;
            for (int i=1; i<=N; i++) {
              if (N%i==0) {
                count += 1;
              }
            }
            System.out.println(N+" has "+count+" divisors");
          }
          else{
            System.out.println(N+" is an odd number. So, now stop. Run again!");
            break;
          }
        }
        
       
    }
}





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


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



import java.util.Scanner;

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

        int count = 0;
        int number = 2;

        System.out.println("Perfect numbers:");
        for (; count < N; number++) {
            int sum = 0;
            for (int i = 1; i < number; i++) {
                if (number % i == 0) {
                    sum += i;
                }
            }
            if (sum == number) {
                System.out.println(number);
                count++;
            }
        }
        
        
    }
}






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



import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.print("Start: ");
        int start = scanner.nextInt();
        System.out.print("Stop: ");
        int stop = scanner.nextInt();
        scanner.close();

        for (int i = start; i <= stop; i++) {
            System.out.println("Times Table of " + i + ":");
            for (int j = 1; j <= 10; j++) {
                System.out.println(i + " x " + j + " = " + (i * j));
            }
            System.out.println();
        }
    }
}








Task07-----------------------------------------------------------------------------------





import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        
        // Input range
        System.out.print("Enter starting number (inclusive): ");
        int start = scanner.nextInt();
        System.out.print("Enter ending number (inclusive): ");
        int end = scanner.nextInt();
        
        // Input divisor
        System.out.print("Enter divisor: ");
        int divisor = scanner.nextInt();
        
        
        // Loop through each number in the range
        for (int num = start; num <= end; num++) {
          if (divisor==0 || start==end){
          System.out.print("Divisor cannot be 0 OR start and ending cannot be same");
          break;
          }
          int product = 1;
          int temp = num;
            
          while (temp != 0) {
            int digit = temp % 10;
            product *= digit;
            temp /= 10;
          }
          if (product % divisor == 0) {
            System.out.print(product + " ");
          }
        }
        
        scanner.close();
    }
}