Latin Small Letter F
The sixth and final hexadecimal letter-digit, lowercase 'f' represents the value 15 — the highest single hex digit — making it essential to expressions like 0xFF (the maximum byte value) and #ffffff (white in CSS). It sits at ASCII code point 102 (0x66), 32 above its uppercase counterpart 'F' at 70 (0x46), maintaining the single-bit case offset (bit 5) shared by all ASCII A–Z / a–z pairs. In English prose, 'f' is a voiceless labiodental fricative that accounts for roughly 2.2 % of characters in typical corpora.
Technical Details
Code Example
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// Float suffix and format specifierfloat pi = 3.14159f; // 'f' suffix for floatprintf("Pi: %.2f\n", pi); // "Pi: 3.14"printf("Max byte: 0x%02x\n", 0xff); // "Max byte: 0xff"
Common Usage
Hexadecimal ubiquity: As the highest hex letter-digit, 'f' dominates byte-boundary expressions — 0xFF for bitmasks, #ffffff for CSS white, 0xFFFF for 16-bit maximums. Any time a field is filled to its maximum representable value, 'f' is the character that fills it.
Floating-point format specifier: In C-family printf-style formatting, %f denotes a floating-point decimal argument (e.g., printf("%f", 3.14) outputs 3.140000). Similar syntax appears in Python 2 string formatting, Ruby, and Go's fmt package, though precision and rounding behavior vary by implementation.
Form feed escape: The sequence \f in C-style strings produces the form feed control character (ASCII 12, 0x0C), historically used to advance printers to the top of the next page. While largely obsolete in screen-based output, it still appears in some report-generation tools and legacy print workflows.
Diacritical variants: Compared to vowels, 'f' has a narrow set of modified forms — ḟ (dot above) appears in Old Irish orthography, and a handful of phonetic extensions exist in IPA and African language transcriptions, but the letter's diacritical family remains minimal across Unicode.
Hexadecimal ubiquity: As the highest hex letter-digit, 'f' dominates byte-boundary expressions — 0xFF for bitmasks, #ffffff for CSS white, 0xFFFF for 16-bit maximums. Any time a field is filled to its maximum representable value, 'f' is the character that fills it.
Floating-point format specifier: In C-family printf-style formatting, %f denotes a floating-point decimal argument (e.g., printf("%f", 3.14) outputs 3.140000). Similar syntax appears in Python 2 string formatting, Ruby, and Go's fmt package, though precision and rounding behavior vary by implementation.
Form feed escape: The sequence \f in C-style strings produces the form feed control character (ASCII 12, 0x0C), historically used to advance printers to the top of the next page. While largely obsolete in screen-based output, it still appears in some report-generation tools and legacy print workflows.
Diacritical variants: Compared to vowels, 'f' has a narrow set of modified forms — ḟ (dot above) appears in Old Irish orthography, and a handful of phonetic extensions exist in IPA and African language transcriptions, but the letter's diacritical family remains minimal across Unicode.