Solution:
public class Solution {
public static void main(String[] args) {
// Create a Scanner object to read input from stdin.
Scanner scan = new Scanner(System.in);
// Read a full line of input from stdin and save it to our variable, inputString.
String inputString = scan.nextLine();
// Close the scanner object, because we've finished reading
// all of the input from stdin needed for this challenge.
scan.close();
// Print a string literal saying "Hello, World." to stdout.
System.out.println("Hello, World.");
System.out.println(inputString);
// TODO: Write a line of code here that prints the contents of inputString to stdout.
}
}
Day 1
Solution:
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 t;
double j;
/* Read and save an integer, double, and String to your variables.*/
t=scan.nextInt();
j=scan.nextDouble();
scan.nextLine();
String e=scan.nextLine();
/* Print the sum of both integer variables on a new line. */
System.out.println(t+i);
System.out.println(j+d);
/* Print the sum of the double variables on a new line. */
System.out.print(s+""+e );
/* Concatenate and print the String variables on a new line;
the 's' variable above should be printed first. */
}
}
Day 2
Solution:
import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;
public class Arithmetic {
public static void main(String[] args) {
Scanner scan = new Scanner(System.in);
double mealCost = scan.nextDouble(); // original meal price
int tipPercent = scan.nextInt(); // tip percentage
int taxPercent = scan.nextInt(); // tax percentage
scan.close();
// Write your calculation code here.
double tip=mealCost*tipPercent/100;
double tax=mealCost*taxPercent/100;
double total=mealCost+tip+tax;
// cast the result of the rounding operation to an int and save it as totalCost
int totalCost = (int) Math.round(total/*numberToRoundHere*/);
// Print your result
System.out.println("The total meal cost is " + totalCost+ " dollars.");
}
}
Day 3
Solution:
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) {
Scanner scan = new Scanner(System.in);
int n = scan.nextInt();
scan.close();
String ans="";
String an="";
// if 'n' is NOT evenly divisible by 2 (i.e.: n is odd)
if(n%2==1){
ans = "Weird";
}
else{
if(2<=n&&n<=5||20<n){
an="Not Weird";
}
else
ans = "Weird";
// Complete the code
}
System.out.print(ans);
System.out.print(an);
}
}
Day 4
Solution:
import java.io.*;
import java.util.*;
public class Person {
private int age;
public Person(int initialAge) {
if (initialAge <0) {
System.out.println("Age is not valid, setting age to 0.");
initialAge = 0;
} else {
age = initialAge;
}
// Add some more code to run some checks on initialAge
}
public void amIOld() {
if( age<13){
System.out.println("You are young."/*Insert correct print statement here*/);
}
if(13<=age && age<18){
System.out.println("You are a teenager."/*Insert correct print statement here*/);
}if(18<=age){
// Write code determining if this person's age is old and print the correct statement:
System.out.println("You are old."/*Insert correct print statement here*/);
}
}
public void yearPasses() {
age++;
// Increment this person's age.
}
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int T = sc.nextInt();
for (int i = 0; i < T; i++) {
int age = sc.nextInt();
Person p = new Person(age);
p.amIOld();
for (int j = 0; j < 3; j++) {
p.yearPasses();
}
p.amIOld();
System.out.println();
}
sc.close();
}
}
Day 5
Solution:
