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                       Rajeev Ranjan Tiwari Java Data Types As explained in the previous chapter, a variable in Java must be a specified data type: (1) public class MyClass {  public static void main(String[] args)  { int myNum = 5; // integer (whole number)  float myFloatNum = 5.99f; // floating point number  char myLetter = 'D'; // character  boolean myBool = true; // boolean  String myText = "Hello"; // String  System.out.println(myNum);  System.out.println(myFloatNum);  System.out.println(myLetter);  System.out.println(myBool);  System.out.println(myText); } }  (2) public class MyClass {  public static void main(String[] args) {  byte myNum = 100;  System.out.println(myNum); } }  (3) public class MyClass {  public static void main(String[] args) {  short myNum = 5000;  System.out.println(myNum); } } (4) public class MyClass { ...

                      Rajeev Ranjan Tiwari   Java  Tutorials What is Java? Java is a popular programming language, created in 1995. It is owned by Oracle, and more than  3 billion  devices run Java. It is used for: Mobile applications (specially Android apps) Desktop applications Web applications Web servers and application servers Games Database connection And much, much more! Why Use Java? Java works on different platforms (Windows, Mac, Linux, Raspberry Pi, etc.) It is one of the most popular programming language in the world It is easy to learn and simple to use It is open-source and free It is secure, fast and powerful It has a huge community support (tens of millions of developers) Java is an object oriented language which gives a clear structure to programs and allows code to be reused, lowering development costs As Java is close to   and  it makes it easy for programmers to switch to J...

                       Rajeev Ranjan Tiwari Python Operators Operators are used to perform operations on variables and values. Python divides the operators in the following groups: Arithmetic operators Assignment operators Comparison operators Logical operators Identity operators Membership operators Bitwise operators (1)  x = 5 y = 3 print(x + y) (2) x = 5 y = 3 print(x - y) (3) x = 5 y = 3 print(x * y) (4) x = 12 y = 3 print(x / y) (5) x = 5 y = 2 print(x % y) (6) x = 2 y = 5 print(x ** y)  #same as 2*2*2*2*2 (7) x = 15 y = 2 print(x // y) #the floor division // rounds the result down to the nearest whole number Python Assignment Operators Assignment operators are used to assign values to variables: (1) x = 5 print(x) (2) x = 5 x += 3 print(x) (3) x = 5 x -= 3 print(x) (4) x = 5 x *= 3 print(x) (5) x = 5 x /= 3 print(x) (6) x = 5 x//=3 print(x) (7) x = 5 x//=3 print(x) (8) x = 5 x **= 3 print(x) (9) x = 5 x &= 3...

                         Rajeev Ranjan Tiwari Python  Variables Creating Variables Variables are containers for storing data values. Unlike other programming languages, Python has no command for declaring a variable. A variable is created the moment you first assign a value to it. (1)   x = 5 y = "Rajeev" print(x) print(y) (2) x = 4 x = "gorgeous" print(x) (3) x = "John" print(x) #double quotes are the same as single quotes: x = 'John' print(x) (4) #Legal variable names: myvar = "John" my_var = "John" _my_var = "John" myVar = "John" MYVAR = "John" myvar2 = "John" #Illegal variable names: 2myvar = "John" my-var = "John" my var = "John" Assign Value to Multiple Variables Python allows you to assign values to multiple variables in one line: (5) x, y, z = "GRAPS", "Apple", "mango" print(x) print(y) print(z) (6) x = y = z = "Orang...

                        Rajeev Ranjan Tiwari Python  Tutorial Learning by Examples With our "Try it Yourself" editor, you can edit Python code and view the result. print ( "Hello, World!" ) What is Python? Python is a popular programming language. It was created by Guido van Rossum, and released in 1991. It is used for: web development (server-side), software development, mathematics, system scripting. What can Python do? Python can be used on a server to create web applications. Python can be used alongside software to create workflows. Python can connect to database systems. It can also read and modify files. Python can be used to handle big data and perform complex mathematics. Python can be used for rapid prototyping, or for production-ready software development. Why Python? Python works on different platforms (Windows, Mac, Linux, Raspberry Pi, etc). Python has a simple syntax similar to the English language. Python h...

                        Rajeev Ranjan Tiwari Folder lock कैसे लगाए बिना सोफ्टवेयर के   दोस्तो आज मै आपको बताने जा रहा हूं कि आप बीना कोई software के आप अपने computer में password कैसे लागा सकते हैं   सिम्पल और असान तरीका सेे तो दिखते हैं कि password  का कया ज़रूरत है और यह क्यो लगय। जता है  दोस्तों हमर जो फ़ोल्डर हाेता है उसमें हम बहुत ज़रूरी कोई document या file photo रखते हैं जो क़िसी से दिखाना नहीं चाहते हैं  तो इसलए password protected करना पड़ता है जो कि सेव है  (1)   सब्से पहले हमे फोल्डर पर right click करना है  फ़िर property open होगा इसमें आपको security tab में ज़ाना है फिर  add पर click करना है उसके बाद name लिखना हैं फिर name को salect करके ok करें फ़िर denay का option total  टिक लगाना  हैं  ओर apply ओर ok करें फ़िर फ़ोल्डर के ओपन करें फोल्डर open नहीं होगा  तो दोस्तों ये बहूत साधरण तरीका है  अब आपका document  कोई नहीं ख़ोल पायेगा...