Answer to Question #265008 in Java | JSP | JSF for Penda

Question

Write a java program that receives two values from the user, adds them together and

display the answer.

Answer 1

1.first option. display sum of two numbers

import java.math.BigDecimal;
import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.print("Enter the first number: ");
        String first = sc.nextLine();
        System.out.print("Enter the second number: ");
        String second = sc.nextLine();

        //check inputs format (only digits and digits with floating point. positive and negative)
        if(!first.matches("[-]?\\d+([.]\\d+)?") || !second.matches("[-]?\\d+([.]\\d+)?")) {
            System.out.println("Wrong input format");
        } else {
            BigDecimal firstDecimal = BigDecimal.valueOf(Double.parseDouble(first));
            BigDecimal secondDecimal = BigDecimal.valueOf(Double.parseDouble(second));
            System.out.println("Answer: " + firstDecimal.add(secondDecimal));
        }

        sc.close();
    }
}

2.second option. concat two string values and display it

import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.print("Enter the first value: ");
        String first = sc.nextLine();
        System.out.print("Enter the second value: ");
        String second = sc.nextLine();

        System.out.println(first + second);
        sc.close();
    }
}