Hackerank

Most HackerRank challenges require you to read input from stdin (standard input) and write output to stdout (standard output).

One popular way to read input from stdin is by using the Scanner class and specifying the Input Stream as System.in. For example:

Scanner scanner = new Scanner(System.in);
String myString = scanner.next();
int myInt = scanner.nextInt();
scanner.close();

System.out.println("myString is: " + myString);
System.out.println("myInt is: " + myInt);

The code above creates a Scanner object named  and uses it to read a String and an int. It then closes the Scanner object because there is no more input to read, and prints to stdout using System.out.println(String). So, if our input is:

Hi 5

Our code will print:

myString is: Hi
myInt is: 5

import java.util.*;

public class Solution {

    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int a = scan.nextInt();
        int b = scan.nextInt();
        int c = scan.nextInt();
        scan.close();
        // Complete this line
        // Complete this line

        System.out.println(a);
        System.out.println( b);
        System.out.println( c);
        // Complete this line
        // Complete this line
    }
}

*******************************************************
import java.util.Scanner;

public class Solution {

    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int i = scan.nextInt();
double d = scan.nextDouble();
       scan.nextLine();
          String s=scan.nextLine();
        // Write your code here.

        System.out.println("String: " + s);
        System.out.println("Double: " + d);
        System.out.println("Int: " + i);
    }
}

Triki part nextLine() toma los expacios tambien, cosa que next no lo hace

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package hackerrank1;

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

public class Hackerrank1 {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        // TODO code application logic here
            int i = 4;
        double d = 4.0;
        String s = "HackerRank ";

        Scanner scan = new Scanner(System.in);
        int j=0;

String e="hello";

int myInt = scan.nextInt();
int myInt2 = scan.nextInt();
scan.nextLine();
String myString = scan.nextLine();

scan.close();


double e1= myInt2*1.0;

System.out.println(i+ myInt);
System.out.println(d+ e1);
System.out.println("myString is: " + myString);




    }

**************************

otro ejemplo

import java.util.Scanner;

public class CadenaDeCaracteres2 {
    public static void main(String[] ar) {
        Scanner teclado=new Scanner(System.in);
        String apenom1,apenom2;
        int edad1,edad2;
        System.out.print("Ingrese el apellido y el nombre:");
        apenom1=teclado.nextLine();
        System.out.print("Ingrese edad:");
        edad1=teclado.nextInt();
        System.out.print("Ingrese el apellido y el nombre:");
        teclado.nextLine();
        apenom2=teclado.nextLine();
        System.out.print("Ingrese edad:");
        edad2=teclado.nextInt();
        System.out.print("La persona de mayor edad es:");
        if (edad1>edad2) {
            System.out.print(apenom1);
        } else {
            System.out.print(apenom2);
        }
    }
}