The C Character Set – part 4.

The C Character Set – part 4.

https://www.gyanodhan.com/video/7A2.%20Computer%20Science/Let%20Us%20C%20Programming/186.%20Let%20Us%20C%20by%20Yashavant%20P.%20Kanetkar%20-%20The%20C%20Character%20Set%20-%20part%204.mp4

Here’s Part 4 of an overview of the C character set, assuming you’re continuing a breakdown of the C programming language’s fundamental elements. If you’d like this to match a previous format or style, feel free to share that.

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The C Character Set – Part 4: Trigraphs and Digraphs

What are Trigraphs?

Trigraphs are sequences of three characters that represent a single character not easily available on some keyboards. Although rarely used today, they are part of the C standard for backward compatibility with older systems.

Trigraph Sequences

Example:

Warning: Trigraphs are considered obsolete and can confuse readers. Most compilers disable them by default or issue warnings.

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What are Digraphs?

Digraphs are two-character sequences that provide alternate ways to write some punctuation characters, particularly useful on systems where those characters are difficult to type.

Digraph Sequences

Example:

Note: Unlike trigraphs, digraphs are more accepted but still uncommon in modern codebases.

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Summary

• Trigraphs: Deprecated and rarely used; composed of ?? followed by a third character.

• Digraphs: Two-character alternatives for braces, brackets, and the hash sign; supported but rarely necessary.

• Modern usage: Most modern systems and editors support all characters directly. These constructs mainly exist for compatibility.

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Would you like Part 5 to cover character classification (e.g., letters, digits, etc.), or something else like escape sequences, keywords, or operators?

The C Character Set – part 4.

The C programming Language