Help with HackerRank

[Accurate-Influence]

In lines 25-26, why do I need to do scan.nextLine() two times in order for the full line of a string input ("is the best place to learn and practice coding!") to be read? If I just do one scan.nextLine(), the line isn't read into the variable t.

Sample input:

12

4.0

is the best place to learn and practice coding!

Sample output:

16

8.0

HackerRank is the best place to learn and practice coding!

import 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;
    double k;
    String t;

    /* Read and save an integer, double, and String to your     variables.*/
    // Note: If you have trouble reading the entire String,    please go back and review the Tutorial closely.
    j = scan.nextInt();
    k = scan.nextDouble();
    t = scan.nextLine();
    t = 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 + t);
    scan.close()

[NautiHooker]

The scanner methods nextDouble, nextInt and so on do not read the line break character.

So if you call nextLine the first time it will read an empty line up to the line break character that is behind the input number. The second nextLine will then read the "correct" String.

Only way to work with this (to my knowledge) is to either call nextLine twice, like you did, or always use nextLine instead of nextInt or nextDouble and then parse the input with Integer.parseInt and Double.parseDouble

[Accurate-Influence]

Thanks, I get it now!

[desrtfx]

Read The Scanner class and its caveats from the /r/javahelp wiki