ASCII Character: y with diaeresis

About the y with diaeresis Character

ASCII code 255 (0xFF) represents the y with diaeresis character in the extended ASCII table (128–255). It is a Latin accented character commonly used in European languages such as French, German, Spanish, Portuguese, and Scandinavian languages. The extended ASCII range builds upon the original 128-character ASCII set, adding accented letters, currency symbols, typographic marks, and mathematical symbols. These characters are defined by the Windows-1252 (CP-1252) encoding, which is a superset of ISO 8859-1 (Latin-1). In modern web development, UTF-8 encoding is preferred, but understanding extended ASCII remains important for legacy system compatibility and character encoding troubleshooting.

Encoding Details

Source Code Examples

// Character literal
let char = 'ÿ';
// Using char code
let char2 = String.fromCharCode(255);
// Unicode escape
let char3 = '\u00FF';

# Character literal
char = 'ÿ'
# Using chr()
char = chr(255)
# Using ord() to get code
code = ord('ÿ')  # Returns 255

<!-- Direct character -->
ÿ
<!-- HTML entity (numeric) -->
&#255;
<!-- Hex entity -->
&#xFF;

// Character literal
char c = 'ÿ';
// Using cast
char c2 = (char)255;
// To get code from char
int code = (int)'ÿ';  // Returns 255

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