LPU Java Unit 2 Lecture 12 RB | LPUCOLAB
LPU_Java_Unit 2_Lecture 12_RB
1. Problem Statement
Preethi is working on a project to automate sales tax calculations for items in a store. She wants to create a program that takes the price of an item and the sales tax rate as input and calculates the final price of the item after applying the sales tax.
Write a program that handles both integer and double inputs using an overloaded method named calculateFinalPrice and print the final price of the item.
Formula Used:
Final price = price + ((price * sales tax rate) / 100)
Input format:
The first two lines of input consist of two integers a and b, representing the price of the item and the sales tax rate.
The third and fourth lines consist of two double values m and n, representing the price of the item and the sales tax rate.
Output format:
The first line of output prints an integer, representing the final price of the item after applying the sales tax for integer inputs (a and b).
The second line prints a double value, representing the final price of the item after applying the sales tax for double-value inputs (m and n), rounded to two decimal places.
Solution:
class SalesTaxCalculator {
public static int calculateFinalPrice(int price, int taxRate) {
return (int)(price + ((price * taxRate) / 100.0));
}
public static double calculateFinalPrice(double price, double taxRate) {
return price + ((price * taxRate) / 100.0);
}
}
2. Problem Statement
Bob has been tasked with creating a program to calculate and display the circumference and area of the circle.
The program should allow Bob to input the radius of a circle as both an integer and a double and compute both the circumference and area of the circle using separate overloaded methods:
calculateCircumference- To calculate the circumference using the formula2 * 3.14 * radiuscalculateArea- To calculate the area3.14 * radius * radius
Write a program to help Bob.
Input format:
The first line of input consists of an integer m, representing the radius of the circle as a whole number.
The second line consists of a double value n, representing the radius of the circle as a decimal number.
Output format:
The first line of output displays two space-separated double values, rounded to two decimal places, representing the circumference of the circle with the integer radius and the double radius, respectively.
The second line displays two space-separated double values, rounded to two decimal places, representing the area of the circle with the integer radius and the double radius, respectively.
Solution:
class CircleUtils {
public static double calculateCircumference(int radius) {
return 2 * 3.14 * radius;
}
public static double calculateCircumference(double radius) {
return 2 * 3.14 * radius;
}
public static double calculateArea(int radius) {
return 3.14 * radius * radius;
}
public static double calculateArea(double radius) {
return 3.14 * radius * radius;
}
}
3. Problem Statement
Anu is tasked with creating a program to determine whether a given number or a range of numbers falls into one of two categories: prime numbers or Fibonacci numbers. There are two constructors to achieve this task:
Single Number Checker
- Constructor:
PrimeFibonacciChecker(int number, String type) - Input: A single integer
numberand a type ("prime" or "fibonacci"). - Output: Determine if the provided number is a prime number or part of the Fibonacci series.
Range Checker
- Constructor:
PrimeFibonacciChecker(int start, int end, String type) - Input: A range of integers defined by a start and end value, along with a type ("prime" or "fibonacci").
- Output: Find all numbers within the given range that are prime numbers or part of the Fibonacci series.
Input format:
The first line contains either a single integer x (for a single number check) or two integers start and end separated by a space (for a range check).
The second line contains a string type, which can be either "prime" or "fibonacci," indicating the type of check to perform.
Output format:
For a single number check:
- If the type is "prime," the program outputs whether the given number is a prime number or not.
- If the type is "fibonacci," the program outputs whether the given number is part of the Fibonacci series or not.
For a range check: - If the type is "prime," the program outputs all prime numbers within the specified range. - If the type is "fibonacci," the program outputs all Fibonacci numbers within the specified range.
If an invalid type is specified, the program outputs Invalid.
Code constraints:
1 ≤ x ≤ 100
Solution:
class PrimeFibonacciChecker {
public PrimeFibonacciChecker(int number, String type) {
if (type.equals("prime")) {
if (isPrime(number)) {
System.out.println(number + " is a prime number.");
} else {
System.out.println(number + " is not a prime number.");
}
} else if (type.equals("fibonacci")) {
if (isFibonacci(number)) {
System.out.println(number + " is part of the Fibonacci series.");
} else {
System.out.println(number + " is not part of the Fibonacci series.");
}
} else {
System.out.println("Invalid.");
}
}
public PrimeFibonacciChecker(int start, int end, String type) {
if (type.equals("prime")) {
List<Integer> primes = new ArrayList<>();
for (int i = start; i <= end; i++) {
if (isPrime(i)) {
primes.add(i);
}
}
System.out.println("Prime numbers in the range " + start + " to " + end + ": " + primes);
} else if (type.equals("fibonacci")) {
List<Integer> fibonacciNumbers = new ArrayList<>();
for (int i = start; i <= end; i++) {
if (isFibonacci(i)) {
fibonacciNumbers.add(i);
}
}
System.out.println("Fibonacci numbers in the range " + start + " to " + end + ": " + fibonacciNumbers);
} else {
System.out.println("Invalid.");
}
}
private boolean isPrime(int number) {
if (number <= 1) {
return false;
}
for (int i = 2; i * i <= number; i++) {
if (number % i == 0) {
return false;
}
}
return true;
}
private boolean isFibonacci(int number) {
int a = 0, b = 1;
while (b < number) {
int temp = a + b;
a = b;
b = temp;
}
return b == number || number == 0;
}
}