Basic Programs

Author: sathishmepco

InterviewPrograms/src/com/java/basic/AddWithoutPlus.java

@@ -5,7 +5,7 @@
  * 
  * Use bitwise operators instead of using + operator
  * bitwise and = &
- * xor operator = ^
+ * XOR operator = ^
  * shift operator = <<
  *  
  */

InterviewPrograms/src/com/java/basic/DigitsOfNumber.java

@@ -22,7 +22,7 @@ public class DigitsOfNumber {
 	public static void main(String[] args) {
 		Scanner scanner = new Scanner(System.in);
 		System.out.println("Enter any positive integer :: ");
-		int num = Integer.parseInt(scanner.nextLine().trim());
+		int num = scanner.nextInt();
 
 		ArrayList<Integer> digitsList = new ArrayList<>();
 		while(num > 0){

InterviewPrograms/src/com/java/basic/Divisors.java

@@ -22,7 +22,7 @@ public class Divisors {
 	public static void main(String[] args) {
 		Scanner scanner = new Scanner(System.in);
 		System.out.println("Enter the N value : ");
-		int N = Integer.parseInt(scanner.nextLine().trim());
+		int N = scanner.nextInt();
 
 		TreeSet<Integer> divisors = new TreeSet<>();
 		for(int i=1;i<N;i++){
@@ -44,11 +44,13 @@ public static void main(String[] args) {
 	}
 }
 /*
+	OUTPUT
 	Enter the N value : 45
 	The divisors of 45 are : 
 	[1, 3, 5, 9, 15, 45]
 	Number of Divisors are : 6
 
+	OUTPUT
 	Enter the N value : 60
 	The divisors of 60 are : 
 	[1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60]

InterviewPrograms/src/com/java/basic/EvenOrOdd.java

@@ -17,7 +17,7 @@ public class EvenOrOdd {
 	public static void main(String[] args) {
 		Scanner scanner = new Scanner(System.in);
 		System.out.println("Enter the any number : ");
-		int num = Integer.parseInt(scanner.nextLine().trim());
+		int num = scanner.nextInt();
 		if( num % 2 == 0)
 			System.out.println("Given number is EVEN");
 		else
@@ -27,10 +27,10 @@ public static void main(String[] args) {
 }
 /*
 	OUTPUT
-	
 	Enter the any number : 22
 	Given number is EVEN
 	
+	OUTPUT
 	Enter the any number : 25
 	Given number is ODD
 */

InterviewPrograms/src/com/java/basic/Factorial.java

@@ -15,7 +15,7 @@
  *  n! can also be written as
  *  n! = n * (n-1)!
  *  
- * eg: Factorial 4 ( 4! ) is equal to 24.
+ * say N = 4: Factorial 4 ( 4! ) is equal to 24.
  * 4! = 4 * 3 * 2 * 1;
  * 5! = 5 * 4 * 3 * 2 * 1;
  * 5! = 5 * 4!
@@ -25,7 +25,7 @@ public class Factorial {
 	public static void main(String[] args) {
 		Scanner scanner = new Scanner(System.in);
 		System.out.println("Enter the any number : ");
-		int N = Integer.parseInt(scanner.nextLine().trim());
+		int N = scanner.nextInt();
 
 		int result =1;
 		for(int i=1; i<=N; i++)
@@ -38,11 +38,10 @@ public static void main(String[] args) {
 }
 /*
 	OUTPUT
-	
 	Enter the any number : 5
 	Factorial of 5 is 120
 	
+	OUTPUT
 	Enter the any number : 10
 	Factorial of 10 is 3628800
-
 */

InterviewPrograms/src/com/java/basic/FactorialUsingRecursion.java

@@ -36,21 +36,22 @@ public static int factorial(int n){
 	public static void main(String[] args) {
 		Scanner scanner = new Scanner(System.in);
 		System.out.println("Enter the any number : ");
-		int N = Integer.parseInt(scanner.nextLine().trim());
+		int N = scanner.nextInt();
 
 		int result = factorial(N);
 
-		String output = String.format("Factorial of %d is %d", N,result);
-		System.out.println(output);
+		System.out.println("Factorial of "+N+" is ");
+		System.out.println(result);
+		
 		scanner.close();
 	}
 }
 /*
 	OUTPUT
-	
 	Enter the any number : 5
 	Factorial of 5 is 120
 	
+	OUTPUT
 	Enter the any number : 10
 	Factorial of 10 is 3628800
 */

InterviewPrograms/src/com/java/basic/FactorsOfANumber.java

@@ -19,7 +19,7 @@ public class FactorsOfANumber {
 	public static void main(String[] args) {
 		Scanner scanner = new Scanner(System.in);
 		System.out.println("Enter any positive integer :: ");
-		int num = Integer.parseInt(scanner.nextLine().trim());
+		int num = scanner.nextInt();
 
 		System.out.println("The factors of the given number are :");
 		printFactors(num);
@@ -40,6 +40,7 @@ private static void printFactors(int num){
 	The factors of the given number are :
 	1, 2, 4, 5, 8, 10, 20, 40
 	
+	OUTPUT
 	Enter any positive integer :: 75
 	The factors of the given number are :
 	1, 3, 5, 15, 25, 75

InterviewPrograms/src/com/java/basic/PositiveOrNegative.java

@@ -20,7 +20,7 @@ public static void main(String[] args) {
 		Scanner scanner = new Scanner(System.in);
 		System.out.println("Enter any integer : ");
 
-		int n = Integer.parseInt(scanner.nextLine().trim());
+		int n = scanner.nextInt();
 		if(n > 0 )
 			System.out.println(n+" is a Positive Number.");
 		else if( n < 0 )
@@ -33,13 +33,14 @@ else if( n < 0 )
 }
 /*
 	OUTPUT
-	
 	Enter any integer : 155
 	155 is a Positive Number.
 
+	OUTPUT
 	Enter any integer : -77
 	-77 is a Negative Number.
 
+	OUTPUT
 	Enter any integer : 0
 	Zero is neither Positive nor Negative.
 */

InterviewPrograms/src/com/java/basic/SwapApproach1.java

@@ -22,35 +22,38 @@ public class SwapApproach1 {
 	public static void main(String[] args) {
 		Scanner scanner = new Scanner(System.in);
 		System.out.println("Enter the value for a : ");
-		int a = Integer.parseInt(scanner.nextLine().trim());
+		int a = scanner.nextInt();
 		System.out.println("Enter the value for b : ");
-		int b = Integer.parseInt(scanner.nextLine().trim());
+		int b = scanner.nextInt();
 
-		String str = String.format("Before swapping a & b is %d & %d", a,b);
-		System.out.println(str);
+		System.out.println("Before swapping a & b : ");
+		System.out.println("a = "+a+", b = "+b);
 
 		//using +, - operators
 		a = a + b;
 		b = a - b;
 		a = a - b;
 
-		str = String.format("After swapping a & b is %d & %d", a,b);
-		System.out.println(str);
+		System.out.println("After swapping a & b : ");
+		System.out.println("a = "+a+", b = "+b);
 
 		scanner.close();
 	}
 }
 /*
 	OUTPUT
-	
 	Enter the value for a : 15
 	Enter the value for b : 20
-	Before swapping a & b is 15 & 20
-	After swapping a & b is 20 & 15
+	Before swapping a & b : 
+	a = 15, b = 20
+	After swapping a & b : 
+	a = 20, b = 15
 	
+	OUTPUT
 	Enter the value for a : 2
 	Enter the value for b : 7
-	Before swapping a & b is 2 & 7 
-	After swapping a & b is 7 & 2
-
+	Before swapping a & b : 
+	a = 15, b = 10
+	After swapping a & b : 
+	a = 10, b = 15
 */

InterviewPrograms/src/com/java/basic/SwapApproach2.java

@@ -18,39 +18,41 @@
  *  
  */
 public class SwapApproach2 {
-	
 	public static void main(String[] args) {
 		Scanner scanner = new Scanner(System.in);
 		System.out.println("Enter the value for a : ");
-		int a = Integer.parseInt(scanner.nextLine().trim());
+		int a = scanner.nextInt();
 		System.out.println("Enter the value for b : ");
-		int b = Integer.parseInt(scanner.nextLine().trim());
+		int b = scanner.nextInt();
 
-		String str = String.format("Before swapping a & b is %d & %d", a,b);
-		System.out.println(str);
+		System.out.println("Before swapping a & b : ");
+		System.out.println("a = "+a+", b = "+b);
 
 		//using *, / operators
 		a = a * b;
 		b = a / b;
 		a = a / b;
 
-		str = String.format("After swapping a & b is %d & %d", a,b);
-		System.out.println(str);
+		System.out.println("After swapping a & b : ");
+		System.out.println("a = "+a+", b = "+b);
 
 		scanner.close();
 	}
 }
 /*
 	OUTPUT
-	
 	Enter the value for a : 15
 	Enter the value for b : 20
-	Before swapping a & b is 15 & 20
-	After swapping a & b is 20 & 15
+	Before swapping a & b : 
+	a = 15, b = 20
+	After swapping a & b : 
+	a = 20, b = 15
 	
+	OUTPUT
 	Enter the value for a : 15
 	Enter the value for b : 10
-	Before swapping a & b is 15 & 10 
-	After swapping a & b is 10 & 15
-
+	Before swapping a & b : 
+	a = 15, b = 10
+	After swapping a & b : 
+	a = 10, b = 15
 */