Data types and variables

Understanding data types

In programming, data types are used to classify different types of data. Here are some common data types:

• Integer: int age = 25;

• Floating-point: double pi = 3.14;

• Boolean: boolean isTrue = true;

• Character: char letter = 'a';

• String: String name = "Alice";

Declaring and initializing variables

Variables are used to store data in a program. Here's an example of how to declare and initialize variables in Java:

// Declare and initialize an integer variable
int age = 25;

// Declare and initialize a double variable
double pi = 3.14;

// Declare and initialize a boolean variable
boolean isTrue = true;

// Declare and initialize a character variable
char letter = 'a';

// Declare and initialize a string variable
String name = "Alice";

Basic arithmetic operations

Arithmetic operations are used to perform mathematical calculations in a program. Here are some examples

// Addition
int sum = 2 + 3; // sum = 5

// Subtraction
int difference = 5 - 2; // difference = 3

// Multiplication
int product = 2 * 3; // product = 6

// Division
double quotient = 10.0 / 3.0; // quotient = 3.3333333333333335

// Modulus (remainder)
int remainder = 10 % 3; // remainder = 1

In the above examples, int and double are data types used to represent integer and floating-point numbers, respectively. The arithmetic operators (+, -, *, /, and %) are used to perform addition, subtraction, multiplication, division, and modulus (remainder) operations, respectively.