JAVA Basic program(practical-2)

prac 2.1. WAP to find a diameter from given area of circle.

import java.util.Scanner;

public class prac_2_1 {
    public static void main(String[] args) {
        Scanner SC = new Scanner(System.in);
        System.out.println("enter area");
        Float a = SC.nextFloat(); // Input area of the circle
        System.out.println(Math.sqrt((a / 3.14)) * 2); // Calculate diameter using the area
    }
}
    

prac 2.2. WAP to check whether the given number is positive or negative.

import java.util.Scanner;

public class prac_2_2 {
    public static void main(String[] args) {
        Scanner SC = new Scanner(System.in);
        System.out.println("enter number");
        int n = SC.nextInt(); // Input the number
        if (n > 0) {
            System.out.println("Number is positive");
        } else if (n == 0) {
            System.out.println("Number is zero");
        } else {
            System.out.println("Number is negative");
        }
    }
}
    

prac 2.3. WAP to make a Simple Calculator using switch...case.

import java.util.Scanner;

public class prac_2_3 {
    public static void main(String[] args) {
        Scanner SC = new Scanner(System.in);
        System.out.println("enter 1 for Addition");
        System.out.println("enter 2 for Subtraction");
        System.out.println("enter 3 for Multiplication");
        System.out.println("enter 4 for division");
        System.out.println("enter Choice");
        int choice = SC.nextInt(); // Input operation choice
        System.out.println("enter a and b");
        int a = SC.nextInt(); // Input operands
        int b = SC.nextInt();
        switch (choice) {
            case 1:
                System.out.println(a + b); // Addition
                break;
            case 2:
                System.out.println(a - b); // Subtraction
                break;
            case 3:
                System.out.println(a * b); // Multiplication
                break;
            case 4:
                System.out.println(a / b); // Division
                break;
            default:
                System.out.println("enter valid choice");
        }
    }
}
    

prac 2.4. WAP to print numbers between two given numbers which are divisible by 2 but not divisible by 3.

import java.util.Scanner;

public class prac_2_4 {
    public static void main(String[] args) {
        Scanner SC = new Scanner(System.in);
        System.out.println("enter n1 and n2");
        int n1 = SC.nextInt(); // Input lower bound
        int n2 = SC.nextInt(); // Input upper bound
        int n;
        for (n = n1; n <= n2; n++) {
            if (n % 2 == 0 && n % 3 != 0) { // Check if divisible by 2 but not by 3
                System.out.println(n);
            }
        }
    }
}
    

prac 2.5. WAP to find factorial of the given number.

import java.util.Scanner;

public class prac_2_5 {
    public static void main(String[] args) {
        Scanner SC = new Scanner(System.in);
        int n, i, fact = 1;
        System.out.println("enter n:");
        n = SC.nextInt(); // Input number
        for (i = 1; i <= n; i++) {
            fact = fact * i; // Calculate factorial
        }
        System.out.println("factorial of " + n + " is " + fact);
    }
}
    

prac 2.6. WAP that prompts the user to input a letter and check whether it is a vowel or consonant.

import java.util.Scanner;

public class prac_2_6 {
    public static void main(String[] args) {
        Scanner SC = new Scanner(System.in);
        System.out.println("enter character:");
        char a = SC.next().charAt(0); // Input character
        if (a == 'a' || a == 'e' || a == 'i' || a == 'o' || a == 'u' || 
            a == 'A' || a == 'E' || a == 'I' || a == 'O' || a == 'U') {
            System.out.println(a + " is a vowel"); // Check if vowel
        } else {
            System.out.println(a + " is a consonant"); // Otherwise consonant
        }
    }
}
    

prac 2.7. WAP to calculate the monthly telephone bill based on the number of calls.

import java.util.Scanner;

public class prac_2_7 {
    public static void main(String[] args) {
        Scanner SC = new Scanner(System.in);
        System.out.println("enter the number of calls:");
        int n = SC.nextInt(); // Input number of calls
        double bill = 200.0; // Minimum bill amount
        if (n > 100) { // Calculate additional charges based on call count
            int ex = n - 100;
            bill += ex * 0.60;
            if (n > 150) {
                ex = n - 150;
                bill += ex * 0.50;
                if (n > 200) {
                    ex = n - 200;
                    bill += ex * 0.40;
                }
            }
        }
        System.out.println("the total bill amount is " + bill); // Display total bill
    }
}
    

prac 2.8. WAP to find whether the given number is prime or not.

import java.util.Scanner;

public class prac_2_8 {
    public static void main(String[] args) {
        Scanner SC = new Scanner(System.in);
        System.out.println("enter the number");
        int n = SC.nextInt(); // Input number
        int flag = 0, i;
        for (i = 2; i < n; i++) {
            if (n % i == 0) { // Check for factors
                flag = 1;
                break;
            }
        }
        if (flag == 0) {
            System.out.println(n + " is prime number"); // Prime number check
        } else {
            System.out.println(n + " is not prime number");
        }
    }
}
    

prac 2.9. WAP to find out the largest number from given three numbers without using Logical Operator.

import java.util.Scanner;

public class prac_2_9 {
    public static void main(String[] args) {
        Scanner SC = new Scanner(System.in);
        System.out.println("enter the numbers");
        int n1 = SC.nextInt(); // Input numbers
        int n2 = SC.nextInt();
        int n3 = SC.nextInt();
        int max;
        // Determine maximum using ternary operator
        max = n1 > n2 ? (n1 > n3 ? n1 : n3) : (n2 > n3 ? n2 : n3);
        System.out.println("Largest no is " + max); // Display maximum number
    }
}
    

prac 2.10. WAP to read marks of five subjects and calculate percentage and print class accordingly.

import java.util.Scanner;

public class prac_2_10 {
    public static void main(String[] args) {
        Scanner SC = new Scanner(System.in);
        int n1, n2, n3, n4, n5, total;
        System.out.println("enter marks of five subjects (out of 20)");
        n1 = SC.nextInt(); // Input marks
        n2 = SC.nextInt();
        n3 = SC.nextInt();
        n4 = SC.nextInt();
        n5 = SC.nextInt();
        total = n1 + n2 + n3 + n4 + n5; // Calculate total marks
        System.out.println("total is " + total);
        // Determine class based on total percentage
        if (total > 70) {
            System.out.println("Distinction!!!");
        } else if (total >= 60 && total < 70) {
            System.out.println("Distinction!!!");
        } else if (total >= 45 && total < 60) {
            System.out.println("Second Class");
        } else if (total >= 35 && total < 45) {
            System.out.println("Pass");
        } else if (total < 35 && total >= 0) {
            System.out.println("Fail!!");
        }
    }
}
    

prac 2.11. WAP to check type of triangle based on its sides (isosceles, equilateral, scalene).

import java.util.Scanner;

public class prac_2_11 {
    public static void main(String[] args) {
        Scanner SC = new Scanner(System.in);
        System.out.println("enter sides of triangle");
        int n1 = SC.nextInt(); // Input sides of triangle
        int n2 = SC.nextInt();
        int n3 = SC.nextInt();
        if (n1 == n2 && n2 == n3) {
            System.out.println("it is an equilateral triangle"); // Check if equilateral
        } 
        else if (n1 == n2 || n1 == n3 || n2 == n3) {
            System.out.println("it is an isosceles triangle"); // Check if isosceles
        }
        else {
            System.out.println("it is a scalene triangle"); // Otherwise scalene
        }
    }
}