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‎Java-Programs-Practice/Basic-Java/AlgebraicOperations.java

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import java.util.Scanner;
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public class AlgebraicOperations {
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public static void main(String args[]) {
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//Declaring variables
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double n1,n2,res = 0;
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System.out.println("Algebraic Operations of two Numbers\n---");
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Scanner scanner = new Scanner(System.in);
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System.out.println("Enter the number 1: ");
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n1 = scanner.nextDouble();
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System.out.println("Enter the number 2: ");
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n2 = scanner.nextDouble();
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System.out.println("---\nEnter 1 for addition,\n2 for subtraction\n3 for multiplication\n4 for division");
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int operator = scanner.nextInt();
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//Solving by if else loops
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if(operator==1) {
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res =n1+n2;
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}
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else if(operator==2) {
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res =n1-n2;
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}
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else if(operator==3) {
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res =n1*n2;
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}
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else if(operator==4) {
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res =n1/n2;
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}
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else{
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System.out.println("Error!");
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end();
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}
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System.out.println(res);
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end();
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scanner.close();
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}
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static void end() {
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System.out.println("Enter Y to continue or any key to exit!");
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Scanner getEndOption= new Scanner(System.in);
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String option = getEndOption.next();
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if(option.equalsIgnoreCase("Y")) {
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main(null);
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}
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else {
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System.out.println("The Program has ended. Please run the program again.");
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}
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getEndOption.close();
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}
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}

‎Java-Programs-Practice/Basic-Java/AlgrebraicOperationsSwitchCase.java

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import java.util.Scanner;
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public class AlgrebraicOperationsSwitchCase {
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public static void main(String args[]) {
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//Declaring variables
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double n1,n2,res = 0;
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System.out.println("Algebraic Operations of two Numbers with Switch Case Loop\n---");
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Scanner scanner = new Scanner(System.in);
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System.out.println("Enter the number 1: ");
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n1 = scanner.nextDouble();
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System.out.println("Enter the number 2: ");
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n2 = scanner.nextDouble();
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System.out.println("---\nEnter 1 for addition or\n2 for subtraction or\n3 for multiplication or\n4 for division");
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int operator = scanner.nextInt();
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//Solving by switch case loop for simpler code.
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switch(operator) {
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case 1:
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res = n1+n2;
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break;
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case 2:
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res = n1-n2;
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break;
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case 3:
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res = n1*n2;
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break;
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case 4:
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res = n1/n2;
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break;
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default:
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System.out.println("You have chosen a wrong option.\nPlease choose from the above given options.");
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end();
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}
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System.out.println(res);
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end();
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scanner.close();
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}
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static void end() {
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System.out.println("---\nEnter Y to continue or any key to exit!");
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Scanner getEndOption= new Scanner(System.in);
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String option = getEndOption.next();
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if(option.equalsIgnoreCase("Y")) {
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main(null);
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}
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else {
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System.out.println("The Program has ended. Please run the program again.");
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}
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getEndOption.close();
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}
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}
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‎Java-Programs-Practice/Basic-Java/AsciiOfCharacter.java

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import java.util.Scanner;
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public class AsciiOfCharacter {
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public static void main(String[] args) {
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System.out.println("Program to get ASCII Value of Character.\n---");
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Scanner sm = new Scanner(System.in);
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System.out.print("Enter the Character: ");
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char input = sm.next().charAt(0);
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int output = (char)input;
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System.out.println("The ASCII Value of '"+input+"' is: "+output);
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sm.close();
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System.out.println("---\nThe Program has ended.");
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System.exit(0);
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}
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}

‎Java-Programs-Practice/Basic-Java/BigFactorial.java

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import java.math.BigInteger;
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import java.util.Scanner;
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public class BigFactorial {
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public static void main(String[] args) {
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System.out.println("Program to find factorial of a number\n---");
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int num, limit = 200; //recommended limit is 200 for RAM; can be upto 700
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Scanner scanner = new Scanner (System.in);
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System.out.print("Enter the number: ");
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num = scanner.nextInt();
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if (num>limit || num< -limit) {
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System.out.println("Cannot perform factorial for input greater than or lesser than "+limit+".");
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end();
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}
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scanner.close();
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if (num<0) {
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num = -num;
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System.out.println("-"+num+"! = -"+factorial(num));
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end();
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//For numbers lesser than zero.
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}
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else {
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System.out.println(num+"! = "+factorial(num));
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end();
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//For numbers greater than or equal to zero.
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}
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}
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private static Object factorial(int num) {
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long n = num;
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BigInteger output = new BigInteger("1");
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while (n>0) {
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output = output.multiply(BigInteger.valueOf(n));
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n-=1;
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}
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return output;
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}
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private static void end() {
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System.out.println("---\nThe Program has ended.");
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System.exit(0);
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}
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}

‎Java-Programs-Practice/Basic-Java/CalculateAverageWithArray.java

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import java.util.Scanner;
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public class CalculateAverageWithArray {
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public static void main(String[] args) {
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int num;
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double res,temp = 0;
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System.out.println("Program to calculate the Average of the numbers entered in Array.\n---");
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System.out.println("Enter the number of elements:");
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Scanner sm = new Scanner(System.in);
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num = sm.nextInt();
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int[] array = new int[num]; //declaring array
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System.out.println("---\nEnter the elements: ");
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for(int i = 0; i<num; i++) {
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array[i]= sm.nextInt();
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}
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sm.close();
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for(int j=0; j<num; j++) {
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temp = temp + array[j];
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}
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res = temp/num;
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System.out.println("The average of the entered "+num+" numbers is: "+res);
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}
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}

‎Java-Programs-Practice/Basic-Java/EvenOdd.java

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import java.util.Scanner;
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public class EvenOdd {
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public static void main(String[] args) {
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int num,flag;
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System.out.println("Program to check if the number is even or odd!\n---");
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System.out.println("Enter the number: ");
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Scanner scanner = new Scanner(System.in);
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num = scanner.nextInt();
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scanner.close();
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flag = num % 2;
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if(flag == 0) {
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System.out.println("The number you entered is even.");
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}
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else {
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System.out.println("The number you entered is odd.");
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}
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}
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}

‎Java-Programs-Practice/Basic-Java/Factorial.java

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import java.util.Scanner;
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public class Factorial {
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public static void main(String[] args) {
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System.out.println("Program to find factorial of a number\n---");
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int num;
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Scanner scanner = new Scanner (System.in);
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System.out.print("Enter the number: ");
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num = scanner.nextInt();
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if (num>20 || num< -20) {
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System.out.println("Cannot perform factorial for input greater than or lesser than 20.");
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end();
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}
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scanner.close();
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if (num<0) {
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num = -num;
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System.out.println("-"+num+"! = -"+factorial(num));
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end();
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//For numbers lesser than zero.
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}
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else {
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System.out.println(num+"! = "+factorial(num));
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end();
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//For numbers greater than or equal to zero.
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}
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}
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private static long factorial(int num) {
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long n = num, output = 1;
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while (n>0) {
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output = output*n;
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n-=1;
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}
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return output;
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}
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private static void end() {
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System.out.println("---\nThe Program has ended.");
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System.exit(0);
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}
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}

‎Java-Programs-Practice/Basic-Java/HelloWorld.java

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class HelloWorld{
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public static void main(String[] args) {
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System.out.println("Hello World!!\nI'm learning Java.");
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}
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}

‎Java-Programs-Practice/Basic-Java/PositiveNegative.java

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import java.util.Scanner;
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public class PositiveNegative {
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public static void main(String[] args) {
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int num; //Declaring Variables
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System.out.println("Program to check if the entered number (int) is Positive or Negative.\n---");
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Scanner sm = new Scanner(System.in);
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System.out.print("Please enter the number: ");
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num = sm.nextInt();
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sm.close();
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if (num>0) {
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System.out.println("The number you have entered is Positive.");
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}
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else if (num==0) {
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System.out.println("The number you have entered is ZERO.");
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}
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else {
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System.out.println("The number you have entered is Negative.");
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}
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System.out.println("---\nThe Program has ended.");
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}
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}

‎Java-Programs-Practice/Basic-Java/PrimeNumberChecker.java

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import java.util.Scanner;
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public class PrimeNumberChecker {
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public static void main(String[] args) {
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long number,i;
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boolean flag = false;
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System.out.println("A Program to check if the entered number is a Prime Number or not.\n---");
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Scanner sm = new Scanner(System.in);
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System.out.print("Enter the Natural Number: ");
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number = sm.nextInt();
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if (number==1) {
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System.out.println("1 is not a Prime Number."
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+ "\n---\nExplanation: "
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+ "A natural number (i.e. 1, 2, 3, 4, 5, 6, etc.) is called a prime number\n(or a prime) if it has exactly two positive factors, 1 and the number itself.\n1 has only one positive factor i.e. no. 1 only. Hence 1 is neither prime nor composite.");
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System.exit(0);
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}
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if (number<1) {
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System.out.println("Error: Input is negative or zero.\nTry Again!\n---");
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main(null);
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}
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for (i=2; i<number/2; i++) {
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if(number%i==0) {
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System.out.println(number+" is not a Prime Number. It is divisible by: "+i);
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flag=true;
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break;
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}
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if(flag) {
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break;
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}
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}
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if (flag==false) {
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System.out.println(number+" is a Prime Number.");
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}
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sm.close();
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System.out.println("---\nThe Program has ended.");
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System.exit(0);
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}
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}

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