Added interview coding solutions

Author: darshanr27

Interview Coding Questions and Solutions/CheckLeapYear.java

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+/*
+
+Q: Write a program to check if the year is leap or not.
+Exaplaintation: Leap year is a year which is divisible by 4 but not by 100, if the year is divisible by 400 then it is a leap year.
+
+*/
+
+import java.util.Scanner;
+public class CheckLeapYear {
+//	Method to check the year is leap or not
+	static void checkLeap(int year) {
+//		Condition to check the year is leap or not
+		if((year%4 == 0 && year%100 !=0) || year%400 == 0) 
+			System.out.println("Leap Year");
+		else
+			System.out.println("Not a Leap Year");
+	}
+//	Main method
+	public static void main(String[] args) {
+		Scanner scan = new Scanner(System.in);
+		System.out.println("Enter the year:");
+		int year = scan.nextInt();
+		checkLeap(year);
+		scan.close();
+	}
+}

Interview Coding Questions and Solutions/CheckPrime.java

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+/*
+
+Q: Write a java program to check if the number is prime or not.
+Explaination: Prime number is a number which is divisible only by itself and 1.
+
+*/
+
+import java.util.Scanner;
+public class CheckPrime {
+//	Method to check the number is prime or not
+	static void checkPrime(int num) {
+		int count = 0;
+//		Condition to get the check factors for the number
+		for(int i = 2; i <= num/2; i++) {
+			if(num%i == 0) {
+				count++;
+				break;
+			}
+		}
+		
+//		Number is prime if the count increases else number is not a prime
+		if(count == 0)
+			System.out.println(num + " is a prime number.");
+		else
+			System.out.println(num + " is not a prime number.");
+	}
+//	Main method
+	public static void main(String[] args) {
+		Scanner scan = new Scanner(System.in);
+		System.out.println("Enter the number:");
+		int n = scan.nextInt();
+		checkPrime(n);
+		scan.close();
+	}
+}

Interview Coding Questions and Solutions/PrintPrime.java

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+/*
+
+Q: Write a java program to print all the prime numbers in a given interval.
+
+
+*/
+
+import java.util.Scanner;
+public class PrintPrime {
+//	Method to print the prime number in the given range
+	static void printPrime(int start, int end) {
+		System.out.println("Prime numbers between " + start + " and " + end + " are:");
+		int count;
+//		Looping the number from start to end
+		for(int i = start; i <= end; i++) {
+			count = 0;
+//			Check if the number is prime and if it is prime then print
+			for (int j = 2; j <= i/2; j++) {
+				if(i % j == 0) {
+					count++;
+					break;
+				}
+			}
+			if(count == 0) {
+				System.out.print(i + " ");
+			}
+		}
+	}
+//	Main method
+	public static void main(String[] args) {
+		Scanner scan = new Scanner(System.in);
+		System.out.println("Enter the starting number: ");
+		int start = scan.nextInt();
+		System.out.println("Enter the ending number: ");
+		int end = scan.nextInt(); 
+		printPrime(start, end);
+		scan.close();
+	}
+}