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Python type() Function

When learning Python, you will work with different types of data, such as numbers, text, decimal values, and Boolean values. Python provides several built-in functions to help you work with these data types. One of the most useful functions is the type() function . The type() function tells you the data type of a value or variable. It helps you understand what kind of data Python is working with and can make debugging your programs easier. For example, consider these variables: age = 20 price = 99.50 name = "Rahul" is_student = True Although all four variables store data, their data types are different. Python allows us to check these types using type() . Let's understand how it works with simple examples. 1. What Is the type() Function in Python? The type() function is a built-in Python function that returns information about the type of an object. In beginner-level programming, you can use it to check whether a value is an integer, a floating-point number, a string,...
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Java Program to Find the Sum of First N Natural Numbers

💡 Introduction:

Natural numbers are the numbers used for counting — 1, 2, 3, 4, 5, ….
To find the sum of the first n natural numbers, we can use either a loop or a mathematical formula.

The formula is:
[
\text{Sum} = \frac{n(n + 1)}{2}
]

🧠 Java Program using Formula:

import java.util.Scanner;

public class SumOfNaturalNumbers {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        // Taking input from user
        System.out.print("Enter a number (n): ");
        int n = sc.nextInt();

        // Using the mathematical formula
        int sum = n * (n + 1) / 2;

        // Displaying the result
        System.out.println("The sum of first " + n + " natural numbers is: " + sum);

        sc.close();
    }
}

🧾 Example Output:

Enter a number (n): 10
The sum of first 10 natural numbers is: 55

🔍 Explanation:

  • Step 1: The user enters a number, say n = 10.

  • Step 2: The program calculates the sum using the formula n*(n+1)/2.

  • Step 3: It prints 55 as the sum of the first 10 natural numbers.

🔄 Alternate Program using Loop:

If you want to calculate the sum without a formula, here’s another approach:

import java.util.Scanner;

public class SumUsingLoop {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        System.out.print("Enter a number (n): ");
        int n = sc.nextInt();

        int sum = 0;

        // Using for loop to add numbers
        for (int i = 1; i <= n; i++) {
            sum += i;
        }

        System.out.println("The sum of first " + n + " natural numbers is: " + sum);

        sc.close();
    }
}

✅ Conclusion:

You can find the sum of the first n natural numbers easily in Java —
either by using the mathematical formula for efficiency or a loop for clarity.

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