Variables & Data Types

Author: kishanrajput23

3.Variables_and_data_types/README.md

@@ -0,0 +1,34 @@
+# Java Tutorial: Variables and Data Types in Java Programming
+- Just like we have some rules that we follow to speak English (the grammar), we have some rules to follow while writing a Java program. This set of these rules is called syntax. It’s like Vocabulary and Grammar of Java.
+
+### Variables
+- A variable is a container that stores a value.
+- This value can be changed during the execution of the program.
+- Example: int number = 8; (Here, int is a data type, the number is the variable name, and 8 is the value it contains/stores).
+
+### Rules for declaring a variable name
+- We can choose a name while declaring a Java variable if the following rules are followed:
+- Must not begin with a digit. (E.g., 1arry is an invalid variable)
+- Name is case sensitive. (Harry and harry are different)
+- Should not be a keyword (like Void).
+- White space is not allowed. (int Code With Harry is invalid)
+- Can contain alphabets, $character, _character, and digits if the other conditions are met.
+
+### Data Types
+Data types in Java fall under the following categories
+- Primitive Data Types (Intrinsic)
+- Non-Primitive Data Types (Derived)
+
+### Primitive Data Types
+- Java is statically typed, i.e., variables must be declared before use. Java supports 8 primitive data types:
+
+![image](https://user-images.githubusercontent.com/70385488/150118247-b3a99c81-3e86-49b4-b937-980ba0c8dd7c.png)
+
+### How to choose data types for our variables
+- In order to choose the data type, we first need to find the type of data we want to store. After that, we need to analyze the min & max value we might use.
+
+<img src="https://api.codewithharry.com/media/videoSeriesFiles/courseFiles/java-tutorials-for-beginners-3/base64.png" alt="">
+
+### Handwritten Notes: [Click To Download](https://api.codewithharry.com/media/videoSeriesFiles/courseFiles/java-tutorials-for-beginners-3/JavaChapter1.pdf)
+
+### Ultimate Java Cheatsheet: [Click To Download](https://api.codewithharry.com/media/videoSeriesFiles/courseFiles/java-tutorials-for-beginners-3/UltimateJavaCheatSheet.pdf)