Object Oriented Programming Computer Lab 1

Java Programming Assignments

Name: Tejas Sahoo
Roll Number: K057

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1. Evaluation of Expressions

Given Assumptions:

int a = 1;
double d = 1.0;

Results of the Expressions:

1. a = 46 / 9;
   Result: a = 5
   (Integer division truncates the fractional part.)

2. a = 46 % 9 + 4 * 4 - 2;
   Result: a = 19
   Explanation:
   46 % 9 = 1, then 1 + 4 * 4 = 17, and 17 - 2 = 19.

3. a = 45 + 43 % 5 * (23 * 3 % 2);
   Result: a = 45
   Explanation:
   43 % 5 = 3, 23 * 3 = 69, 69 % 2 = 1, so 45 + 3 * 1 = 45.

4. a %= 3 / a + 3;
   Result: a = 0
   Explanation:
   (3 / a) becomes 3 / 1 = 3, then 3 + 3 = 6. a %= 6 means a = 5 % 6 = 0.

5. d = 4 + d * d + 4;
   Result: d = 9.0
   Explanation:
   d * d = 1.0 * 1.0 = 1.0, 4 + 1.0 + 4 = 9.0.

6. d += 1.5 * 3 + (++a);
   Result: d = 14.5
   Explanation:
   ++a increments a to 1, 1.5 * 3 = 4.5, d += 4.5 + 1 = 9.0 + 5.5 = 14.5.

7. d -= 1.5 * 3 + a++;
   Result: d = 9.0
   Explanation:
   a++ uses a = 1 and increments after, 1.5 * 3 = 4.5, d -= 4.5 + 1 = 14.5 - 5.5 = 9.0.

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2. Program to Check Whether a Number is Even or Odd

import java.util.Scanner;
 
public class EvenOdd {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
 
        System.out.print("Enter an integer: ");
        int number = scanner.nextInt();
 
        if (number % 2 == 0) {
            System.out.println(number + " is even.");
        } else {
            System.out.println(number + " is odd.");
        }
 
        scanner.close();
    }
}

3. Program to Solve a Quadratic Equation

import java.util.Scanner;
 
public class QuadraticEquation {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
 
        System.out.print("Enter coefficient a: ");
        double a = scanner.nextDouble();
 
        System.out.print("Enter coefficient b: ");
        double b = scanner.nextDouble();
 
        System.out.print("Enter coefficient c: ");
        double c = scanner.nextDouble();
 
        double discriminant = b * b - 4 * a * c;
 
        if (discriminant > 0) {
            double root1 = (-b + Math.sqrt(discriminant)) / (2 * a);
            double root2 = (-b - Math.sqrt(discriminant)) / (2 * a);
            System.out.println("The roots are real and unequal:");
            System.out.println("Root 1 = " + root1);
            System.out.println("Root 2 = " + root2);
        } else if (discriminant == 0) {
            double root = -b / (2 * a);
            System.out.println("The roots are real and equal:");
            System.out.println("Root = " + root);
        } else {
            System.out.println("The roots are imaginary (no real solutions).");
        }
 
        scanner.close();
    }
}

References

Information

• date: 2025.01.09
• time: 14:59