datatypes.java

mport java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {
	
    public static void main(String[] args) {
        int i = 4;
        double d = 4.0;
        String s = "HackerRank ";
		
        Scanner scan = new Scanner(System.in);
        /* Declare second integer, double, and String variables. */
      int j=scan.nextInt();
    /* Read and save an integer, double, and String to your variables.*/
    double k=scan.nextDouble();
    scan.nextLine();
    String str=scan.nextLine();
    /* Print the sum of both integer variables on a new line. */
    System.out.println(i+j);
    /* Print the sum of the double variables on a new line. */
    System.out.println(d+k);
    /* Concatenate and print the String variables on a new line;
    the 's' variable above should be printed first. */
 
    System.out.println(s+ "" +str);
        
     

        scan.close();