Hactoberfest

Java/Program-8/README.md

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+Q. Java Program to Find if a Given Year is a Leap Year.
+
+
+Leap Year contains 366 days, which comes once every four years. Every leap year corresponds to these facts : 
+
+#A century year is a year ending with 00. A century year is a leap year only if it is divisible by 400.
+#A leap year (except a century year) can be identified if it is exactly divisible by 4.
+#A century year should be divisible by 4 and 100 both.
+#A non-century year should be divisible only by 4.
+
+
+Ex.
+INPUT:  2000
+OUTPUT: 2000 : Leap-year
+LOGIC:	2000 is a century year divisible by 100 and 4.
+INPUT:	2002
+OUTPUT: 2002 : Non Leap-year
+LOGIC:  2002 is not divisible by 4, therefore not a leap year. 

Java/Program-8/program.java

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+// Java program to find a leap year
+
+// Importing Classes/Files
+import java.io.*;
+
+// Class for leap-year dealing
+public class GeeksforGeeks {
+
+	// Method to check leap year
+	public static void isLeapYear(int year)
+	{
+		// flag to take a non-leap year by default
+		boolean is_leap_year = false;
+
+		// If year is divisible by 4
+		if (year % 4 == 0) {
+
+			// To identify whether it
+			// is a century year or
+			// not
+			if (year % 100 == 0) {
+
+				// Checking if year is divisible by 400
+				// therefore century leap year
+				if (year % 400 == 0) {
+					is_leap_year = true;
+				}
+
+				else {
+					is_leap_year = false;
+				}
+			}
+
+			// Out of if loop that is Non century year
+			// but divisible by 4, therefore leap year
+			is_leap_year = true;
+		}
+
+		// We land here when corresponding if fails
+		// If year is not divisible by 4
+		else
+
+			// Flag dealing- Non leap-year
+			is_leap_year = false;
+
+		if (!is_leap_year) {
+			System.out.println(year + " : Non Leap-year");
+		}
+
+		else {
+			System.out.println(year + " : Leap-year");
+		}
+	}
+
+	// Main Driver Code
+	public static void main(String[] args)
+	{
+		// Calling our function by
+		// passing century year
+		isLeapYear(2000);
+
+		// Calling our function by
+		// passing Non-century year
+		isLeapYear(2002);
+	}
+}

Java/program-9/README.md.txt

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+Q. Java Program to Check If a Number is Neon Number or Not
+
+A neon number is a number where the sum of digits of the square of the number is equal to the number. 
+The task is to check and print neon numbers in a range.
+
+Case 1:
+
+Input  : 9
+Output : Given number  9 is Neon number
+
+Explanation : square of 9=9*9=81;
+              sum of digit of square : 8+1=9(which is equal to given number)
+
+
+Case 2:
+
+Input : 8
+Output : Given number is not a Neon number
+
+Explanation : square of 8=8*8=64
+              sum of digit of square : 6+4=10(which is not equal to given number)

Java/program-9/program.java

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+// Java Program to Check If a Number is Neon number or not
+
+// Importing java input/output library
+import java.io.*;
+
+class GFG {
+
+	// Method to check whether number is neon or not
+	// Boolean type
+	public static boolean checkNeon(int n)
+	{
+		// squarring the number to be checked
+		int square = n * n;
+
+		// Initializing current sum to 0
+		int sum = 0;
+
+		// If product is positive
+		while (square > 0) {
+
+			// Step 1: Find remainder
+			int r = square % 10;
+
+			// Add remainder to the current sum
+			sum += r;
+
+			// Drop last digit of the product
+			// and store the number
+			square = square / 10;
+		}
+
+		// Condition check
+		// Sum of digits of number obtained is
+		// equal to original number
+		if (sum == n)
+
+			// number is neon
+			return true;
+		else
+
+			// numbe is not neon
+			return false;
+	}
+
+	// Main driver method
+	public static void main(String[] args)
+	{
+		// Custom input
+		int n = 9;
+
+		// Calling above function to check custom number or
+		// if user entered number via Scanner class
+		if (checkNeon(n))
+
+			// Print number considered is neon
+			System.out.println("Given number " + n
+							+ " is Neon number");
+		else
+
+			// Print number considered is not neon
+			System.out.println("Given number " + n
+							+ " is not a Neon number");
+	}
+}