Java

package com.check;

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        System.out.print("Enter your age: ");
        boolean IsCorrect = false;
        int age = 0;
        do {
            if (in.hasNextInt()) {
                age = in.nextInt();
                IsCorrect = true;
            } else {
                in.nextLine();
                System.out.print(" Incorrect data entered ");
            }
        }
        while (!IsCorrect);
        if (age >= 18 && age < 100) {
            System.out.print("You have the right to vote");
        } else if
        (age < 18 && age > 0) {
            age = 18 - age;
            System.out.print("The number of years after which you can vote - " + age);
        } else {
            System.out.print(" Incorrect data entered ");
        }
    }
}