Added 30 Days of Code files and Updated ReadMe

Author: Manush54

.vscode/settings.json

@@ -0,0 +1,12 @@
+{
+	"java.project.sourcePaths": [
+		"30DaysOfCode",
+		"Java\\Big Number",
+		"Java\\Data Structures",
+		"Java\\Exception Handling",
+		"Java\\Introduction",
+		"Java\\OOP",
+		"Java\\Others",
+		"Java\\Strings"
+	]
+}

30DaysOfCode/Day00.java

@@ -0,0 +1,20 @@
+import java.util.*;
+public class Day00 {
+	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.
+	}
+}

30DaysOfCode/Day01.java

@@ -0,0 +1,39 @@
+import java.util.*;
+public class Day01 {
+   
+   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 e;
+        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();
+        e = scan.nextDouble();
+        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+e);
+		
+        /* 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();
+   }
+}
+
+
+
+

30DaysOfCode/Day02.java

@@ -0,0 +1,21 @@
+import java.util.*;
+
+public class Day02 {
+
+    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();
+      
+        // Calculate Tax and Tip:
+        double tip = mealCost * tipPercent / 100;
+        double tax = mealCost * taxPercent / 100;
+        
+        // cast the result of the rounding operation to an int and save it as totalCost 
+        int totalCost = (int) Math.round(mealCost + tax + tip);
+      
+        System.out.println("The total meal cost is " + totalCost + " dollars.");
+    }
+}

30DaysOfCode/Day03.java

@@ -0,0 +1,23 @@
+import java.io.*;
+
+public class Day03 {
+    public static void main(String[] args) throws IOException {
+        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));
+
+        int N = Integer.parseInt(bufferedReader.readLine().trim());
+        if(N % 2 == 1){
+            System.out.println("Weird");
+        }
+        else if(2 <= N && N <= 5){
+            System.out.println("Not Weird");
+        }
+        else if(6 <= N && N <= 20){
+            System.out.println("Weird");
+        }
+        else {
+            System.out.println("Not Weird");
+        }
+
+        bufferedReader.close();
+    }
+}

30DaysOfCode/Day04.java

@@ -0,0 +1,43 @@
+import java.util.*;
+
+class Person {
+    private int age;    
+  
+    public Person(int initialAge) {
+          // Add some more code to run some checks on initialAge
+          if(initialAge < 0){
+              System.out.println("Age is not valid, setting age to 0.");
+              age = 0;
+          }
+          else{
+              age = initialAge;
+          }
+    }
+
+    public void amIOld() {
+          // Write code determining if this person's age is old and print the correct statement:
+        System.out.println(age < 13 ? "You are young." : age < 18 ? "You are a teenager." : "You are old.");
+    }
+
+    public void yearPasses() {
+          age++;
+    }
+}
+
+public class Day04 {
+    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();
+    }
+}

30DaysOfCode/Day05.java

@@ -0,0 +1,14 @@
+import java.io.*;
+
+public class Day05 {
+    public static void main(String[] args) throws IOException {
+        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));
+
+        int n = Integer.parseInt(bufferedReader.readLine().trim());
+        for (int i = 1; i <= 10; i++){
+            System.out.printf("%d x %d = %d\n", n, i, n*i);
+        }
+
+        bufferedReader.close();
+    }
+}

30DaysOfCode/Day06.java

@@ -0,0 +1,25 @@
+import java.util.*;
+
+public class Day06 {
+
+    public static void main(String[] args) {
+        Scanner in = new Scanner(System.in);
+        int T = in.nextInt();
+        in.nextLine();
+        for (int t = 1; t <= T; t++) {
+            String input = in.nextLine();
+            String odd = new String();
+            String even = new String();
+
+            for (int i = 0; i < input.length(); i++) {
+                if (i % 2 == 0) {
+                    even += input.charAt(i);
+                } else {
+                    odd += input.charAt(i);
+                }
+            }
+            System.out.println(even + " " + odd);
+        }
+        in.close();       
+    }
+}

30DaysOfCode/Day07.java

@@ -0,0 +1,27 @@
+import java.io.*;
+import java.util.*;
+
+
+
+public class Day07 {
+    public static void main(String[] args) throws IOException {
+        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));
+
+        int n = Integer.parseInt(bufferedReader.readLine().trim());
+
+        String[] arrTemp = bufferedReader.readLine().replaceAll("\\s+$", "").split(" ");
+
+        List<Integer> arr = new ArrayList<>();
+
+        for (int i = 0; i < n; i++) {
+            int arrItem = Integer.parseInt(arrTemp[i]);
+            arr.add(arrItem);
+        }
+        
+        for (int j = arr.size() - 1; j >= 0; j--){
+            System.out.printf("%d ", arr.get(j));
+        }
+
+        bufferedReader.close();
+    }
+}

30DaysOfCode/Day08.java

@@ -1,10 +1,4 @@
 import java.io.*;
-import java.math.*;
-import java.security.*;
-import java.text.*;
-import java.util.*;
-import java.util.concurrent.*;
-import java.util.regex.*;
 
 
 

30DaysOfCode/Day09.java

@@ -1,6 +1,6 @@
 import java.util.Scanner;
 
-public class HackerRank_StdinStdout2 {
+public class HackerRank_StdInStdOut2 {
 
     public static void main(String[] args) {
         Scanner scan = new Scanner(System.in);
@@ -12,6 +12,7 @@ public static void main(String[] args) {
         System.out.println("String: " + s);
         System.out.println("Double: " + d);
         System.out.println("Int: " + i);
-        
+
+        scan.close();        
     }
 }