Initial commit

Author: SanielDev

First.java

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+public class First{
+    // We have static keyword in the main function cause we want to execute the main function without creating an object of Main class.
+    public static void main(String[] args){
+        // String args[] stores the values given in the terminal as string
+        // System.out.println("Hello Saniel");
+        System.out.println(args[0]);
+    }
+}
+// Package is a folder in which the java file lies

Inputs.java

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+import java.util.Scanner;
+
+public class Inputs{
+    public static void main(String[] args) {
+        Scanner sc = new Scanner(System.in);
+        // Scanner is a class and sc is the object of the class and we are initializing the constructor of the Scanner class
+        // System.out.println() --> in the standard output stream print something
+        // System.in ==> take the input from keyboard whenever input is asked
+        int input = sc.nextInt();  // nextInt()--> it will take an integer value as a input.
+        String input1 = sc.next();   // it will take string value till space comes
+                                // if we want to take complete sentence then use nextLine() instead of next().
+        System.out.println(input);
+        System.out.println(input1);
+    }
+}

Primitives.java

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+import java.util.Scanner;
+
+public class Primitives{
+    public static void main(String[] args){
+        // There are roughly 6 primitive datatypes
+        //int, float, double, long, char, boolean
+        // int num = 10;
+        // float marks = 98.67f;
+        // double largeDecimalNumber = 234345.3453453;
+        // long largeInteger = 234234234234234L;
+        // char myChar = 'A';
+        // boolean check = true;
+        Scanner sc = new Scanner(System.in);
+        
+        // int roll = sc.nextInt();
+        // System.out.println(roll);
+
+        // String name = sc.nextln();
+        // System.out.println(name);
+
+        // float marks = sc.nextFloat();
+        // System.out.printf(marks);
+
+        // double x = sc.nextDouble();
+        // System.out.println(x);
+
+        // long y = sc.nextLong();
+        // System.out.println(y);
+
+        // Typecasting
+        // int num = (int)56.89f;
+        // System.out.println(num);
+
+        // Automatic type promotion in expression
+        // int a = 257;
+        // byte b = (byte)a;   // Implicit conversion of int to byte 
+        //                     // a byte can store 256 values so when we are storing the value 257
+        //                     // 257  is too big for byte so 257 % 256 = 1 is stored
+        //                     // So the value of byte becomes 1
+        // System.out.println("Value of Byte : " + b);
+
+        // byte a = 40;
+        // byte b = 50;
+        // byte c = 100;
+
+        // int d = (a * b) / c;    // while performing the multiplication operation it easily exceeds the value that can be stored in a byte datatype
+        //                         // Thus, while doing the intermediate operations the byte data is converted into integer datatypes which makes these operations possible
+        // System.out.println(d);
+
+        byte b = 47;
+        char d = 'a';
+        short s = 1098;
+        int j = 78373;
+        float h = 5.87f;
+        double k = 0.123456;
+        double result = (h * b) + (j/d) - (k - d);
+        System.out.println((h * b) + " " + (j/d) + " " + (k - d));
+        System.out.println(result);
+
+    }
+}

Temperature.java

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+import java.util.Scanner;
+
+public class Temperature{
+    public static void main(String[] args){
+        Scanner sc = new Scanner(System.in);
+        System.out.println("Enter the temperature in Celsius: ");
+        float celsius = sc.nextFloat();
+        float fahrenheit = (celsius * 9/5) + 32;
+        System.out.printf("%f degrees Celsius is %.2f degree fahrenheit:", celsius, fahrenheit);
+    }
+}

loops.java

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+public class loops{
+    public static void main(String[] args){
+        // int count = 1;
+        // while(count<=5){
+        //     System.out.println(count);
+        //     count++;
+        // }
+        
+        // Use while loop when you dont know how many times the loop is going to run
+        // Use for loop when you know how many times the loop is going to run
+        
+        // for(int i = 0; i<5; i++){
+        //     System.out.println(i+1);
+        // }
+    }
+}