4 Ways Get Last Digits

Introduction to Getting Last Digits

Getting the last digits of a number is a common task in programming and mathematics. It can be useful in various scenarios, such as calculating the remainder of a division operation or extracting specific information from a number. In this article, we will explore four ways to get the last digits of a number.

Method 1: Using the Modulus Operator

The modulus operator, denoted by the percentage sign (%), is a straightforward way to get the last digits of a number. This operator returns the remainder of a division operation. For example, if you want to get the last two digits of a number, you can use the modulus operator with 100.

📝 Note: The modulus operator is a binary operator, meaning it takes two operands.

To get the last digits using the modulus operator, you can use the following formula: number % 10^n, where n is the number of digits you want to get. For instance, to get the last two digits, you would use number % 100.

Method 2: Using String Conversion

Another way to get the last digits of a number is by converting the number to a string and then extracting the desired digits. This method is more versatile than the modulus operator, as it allows you to get any number of digits from the end of the number.

Here are the steps to get the last digits using string conversion: * Convert the number to a string using the toString() method or string concatenation. * Use the substring() method to extract the desired digits from the end of the string. * Convert the extracted substring back to an integer using the parseInt() method.

For example, to get the last two digits of a number, you can use the following code:

let number = 12345;
let lastTwoDigits = parseInt(number.toString().substring(number.toString().length - 2));

Method 3: Using Arithmetic Operations

You can also get the last digits of a number using arithmetic operations. This method involves dividing the number by 10 raised to the power of the number of digits you want to get, and then taking the integer part of the result.

The formula to get the last digits using arithmetic operations is: number - (number / 10^n), where n is the number of digits you want to get. For instance, to get the last two digits, you would use number - (number / 100).

Method 4: Using Regular Expressions

Regular expressions can be used to extract the last digits of a number. This method involves converting the number to a string and then using a regular expression to match the desired digits.

Here are the steps to get the last digits using regular expressions: * Convert the number to a string using the toString() method or string concatenation. * Use a regular expression to match the desired digits from the end of the string. * Extract the matched digits from the string.

For example, to get the last two digits of a number, you can use the following code:

let number = 12345;
let lastTwoDigits = parseInt(number.toString().match(/.{2}$/)[0]);

Method	Description
Modulus Operator	Uses the modulus operator to get the remainder of a division operation.
String Conversion	Converts the number to a string and extracts the desired digits.
Arithmetic Operations	Uses arithmetic operations to divide the number and get the integer part of the result.
Regular Expressions	Uses regular expressions to match and extract the desired digits.

In conclusion, there are several ways to get the last digits of a number, each with its own advantages and disadvantages. The choice of method depends on the specific use case and personal preference. By understanding these methods, you can choose the best approach for your needs and write more efficient and effective code.