Decoding Strings: A Comprehensive Guide

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A string is a sequence of characters used to represent textual data in programming. Characters can be letters, numbers, punctuation marks, or even symbols like emojis. But hold on, computers are incapable of understanding anything else other than a bunch of 0’s and 1’s.

Then how does it process strings? Through encoding.

Let’s first understand how does it process an Integer .

Integers are simpler for computers to handle because they’re already numbers, which is closer to how computers work internally. So, it is a bit more straightforward than string.

5 in binary is 101.

The computer stores this as a series of 1s and 0s in memory, and when you want to work with the number 5, it processes the binary form.

In Integers, Number -> Binary Format

In Strings, Sequence of Characters -> Individual Characters -> Encoding the Character -> Binary Format

Let’s say you want to write “A” on your screen. The computer doesn’t recognize the letter “A” directly. Instead, it knows that the ASCII code for “A” is 65. In binary, 65 is represented as 01000001.

The most common types of string encodings are ASCII and Unicode, but there are several others as well.

Here’s an Interview Tip for you: If you’re unsure about the character encoding, ask your interviewer if the string is ASCII or Unicode.

ASCII: American Standard Code for Information Interchange

ASCII is one of the earliest and simplest character encoding standards. It uses 7 bits to represent characters, allowing for a total of 128 unique combinations (2⁷) and is foundation for many other encoding.

A -> 65 in ASCII (binary: 01000001)

Extended ASCII

To address the limitation of ASCII’s 128-character set, Extended ASCII was introduced, utilizing an 8-bit encoding system, allowing for 256 characters.

Ñ (Latin capital letter N with tilde) -> 209 in Extended ASCII

Check out the ASCII table at:

[embed]ASCII table - Table of ASCII codes, characters and symbols A complete list of all ASCII codes, characters, symbols and signs included in the 7-bit ASCII table and the extended…www.ascii-code.com

Unicode

Unicode is a universal character encoding standard designed to represent virtually every character from every language in a consistent way. It was introduced to overcome the limitations of ASCII and Extended ASCII and to support a vast range of characters and symbols. Unicode can be implemented using various encoding forms, including UTF-8, UTF-16, and UTF-32.

• Unicode (UTF-8): The go-to choice for modern applications, especially web development. It supports a wide range of characters and is space-efficient for ASCII-heavy text.
• Unicode (UTF-16 or UTF-32): Suitable for applications that require extensive use of non-Latin characters or symbols, though less space-efficient than UTF-8.

In a world of multilinguals and emojis, knowing the differences between these encoding systems helps ensure compatibility, efficiency, and proper representation of text. Although extended varieties of ASCII are still in use, Unicode — particularly UTF-8 — has taken over as the industry standard because of its capacity to represent almost every character or symbol found in any language.

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