Constants and Literals: When and How to Use Them

Constants and Literals: When and How to Use Them

```java
public class Main {
    public static void main(String[] args) {
        // Constants
        final int MAX_SIZE = 100;  // Maximum size for an array
        final double PI = 3.14159;  // Value of pi
        final double GRAVITY = 9.81;  // Acceleration due to gravity

        // Literals
        String name = "Alice";  // String literal
        int age = 30;  // Numeric literal
        boolean isActive = true;  // Boolean literal

        // Driver code to demonstrate the usage of constants and literals
        System.out.println("Constants:");
        System.out.println("Maximum size: " + MAX_SIZE);
        System.out.println("Value of pi: " + PI);
        System.out.println("Acceleration due to gravity: " + GRAVITY);

        System.out.println("\nLiterals:");
        System.out.println("Name: " + name);
        System.out.println("Age: " + age);
        System.out.println("Is active: " + isActive);
    }
}
```
```javascript
// Constants
const MAX_SIZE = 100;  // Maximum size for an array
const PI = 3.14159;  // Value of pi
const GRAVITY = 9.81;  // Acceleration due to gravity

// Literals
let name = "Alice";  // String literal
let age = 30;  // Numeric literal
let isActive = true;  // Boolean literal

// Driver code to demonstrate the usage of constants and literals
console.log("Constants:");
console.log("Maximum size:", MAX_SIZE);
console.log("Value of pi:", PI);
console.log("Acceleration due to gravity:", GRAVITY);

console.log("\nLiterals:");
console.log("Name:", name);
console.log("Age:", age);
console.log("Is active:", isActive);
```
```cpp
#include <iostream>
using namespace std;

int main() {
    // Constants
    const int MAX_SIZE = 100;  // Maximum size for an array
    const double PI = 3.14159;  // Value of pi
    const double GRAVITY = 9.81;  // Acceleration due to gravity

    // Literals
    string name = "Alice";  // String literal
    int age = 30;  // Numeric literal
    bool isActive = true;  // Boolean literal

    // Driver code to demonstrate the usage of constants and literals
    cout << "Constants:" << endl;
    cout << "Maximum size: " << MAX_SIZE << endl;
    cout << "Value of pi: " << PI << endl;
    cout << "Acceleration due to gravity: " << GRAVITY << endl;

    cout << "\nLiterals:" << endl;
    cout << "Name: " << name << endl;
    cout << "Age: " << age << endl;
    cout << "Is active: " << isActive << endl;

    return 0;
}
```
```csharp
using System;

class Program {
    static void Main() {
        // Constants
        const int MAX_SIZE = 100;  // Maximum size for an array
        const double PI = 3.14159;  // Value of pi
        const double GRAVITY = 9.81;  // Acceleration due to gravity

        // Literals
        string name = "Alice";  // String literal
        int age = 30;  // Numeric literal
        bool isActive = true;  // Boolean literal

        // Driver code to demonstrate the usage of constants and literals
        Console.WriteLine("Constants:");
        Console.WriteLine("Maximum size: " + MAX_SIZE);
        Console.WriteLine("Value of pi: " + PI);
        Console.WriteLine("Acceleration due to gravity: " + GRAVITY);

        Console.WriteLine("\nLiterals:");
        Console.WriteLine("Name: " + name);
        Console.WriteLine("Age: " + age);
        Console.WriteLine("Is active: " + isActive);
    }
}
```
```go
package main

import (
    "fmt"
)

func main() {
    // Constants
    const MAX_SIZE = 100  // Maximum size for an array
    const PI = 3.14159  // Value of pi
    const GRAVITY = 9.81  // Acceleration due to gravity

    // Literals
    name := "Alice"  // String literal
    age := 30  // Numeric literal
    isActive := true  // Boolean literal

    // Driver code to demonstrate the usage of constants and literals
    fmt.Println("Constants:")
    fmt.Println("Maximum size:", MAX_SIZE)
    fmt.Println("

Value of pi:", PI)
    fmt.Println("Acceleration due to gravity:", GRAVITY)

    fmt.Println("\nLiterals:")
    fmt.Println("Name:", name)
    fmt.Println("Age:", age)
    fmt.Println("Is active:", isActive)
}
```
```py
# Sandbox code for experimenting with constants and literals

# Constants
MAX_SIZE = 100  # Maximum size for an array
PI = 3.14159  # Value of pi
GRAVITY = 9.81  # Acceleration due to gravity

# Literals
name = "Alice"  # String literal
age = 30  # Numeric literal
is_active = True  # Boolean literal

# Driver code to demonstrate the usage of constants and literals
print("Constants:")
print("Maximum size:", MAX_SIZE)
print("Value of pi:", PI)
print("Acceleration due to gravity:", GRAVITY)

print("\nLiterals:")
print("Name:", name)
print("Age:", age)
print("Is active:", is_active)
```