Solution-Task 2

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;

public class EquationSolver {

    private static final String API_URL = "https://api.mathjs.org/v4/?expr=";

    public static void main(String[] args) {
        try (BufferedReader inputReader = new BufferedReader(new InputStreamReader(System.in))) {
            String expression;
            while (!(expression = inputReader.readLine()).equals("end")) {
                try {
                    // Evaluate the expression and print the result
                    String result = evaluateExpression(expression);
                    System.out.println(expression + " => " + result);
                } catch (IOException e) {
                    // Handle any errors that occur during evaluation
                    System.out.println("An error occurred while evaluating the expression: " + expression);
                    e.printStackTrace();
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public static String evaluateExpression(String expression) throws IOException {
        // Encode the expression to make it URL-safe
        String encodedExpression = URLEncoder.encode(expression, "UTF-8");

        // Construct the API URL with the encoded expression
        String apiUrl = API_URL + encodedExpression;

        // Open a connection to the API URL
        HttpURLConnection connection = (HttpURLConnection) new URL(apiUrl).openConnection();
        connection.setRequestMethod("GET");

        // Get the response code from the API
        int responseCode = connection.getResponseCode();
        if (responseCode == HttpURLConnection.HTTP_OK) {
            // Read the result from the API response
            try (BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()))) {
                return reader.readLine();
            }
        } else {
            // Handle the case when the API returns an error response
            throw new IOException("Error response: " + responseCode);
        }
    }
}