STD 9 - significado y definición. Qué es STD 9
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Qué (quién) es STD 9 - definición

C STANDARD LIBRARY HEADER
Isalnum; Isalpha; Isblank; Iscntrl; Isdigit; Isgraph; Islower; Isprint; Ispunct; Isspace; Isupper; Isxdigit; Tolower; Toupper; Wctype.h; Iswdigit; Iswlower; Iswupper; Ctype.h; Wctype; Wctrans; Towupper; Towlower; Towctrans; Iswxdigit; Iswspace; Iswpunct; Iswprint; Iswgraph; Iswctype; Iswcntrl; Iswalpha; Iswalnum; Iswblank; Std::isalnum; Std::iswalnum; Std::isalpha; Std::iswalpha; Std::islower; Std::iswlower; Std::isupper; Std::iswupper; Std::isdigit; Std::iswdigit; Std::isxdigit; Std::iswxdigit; Std::iscntrl; Std::iswcntrl; Std::isgraph; Std::iswgraph; Std::isspace; Std::iswspace; Std::isblank; Std::iswblank; Std::isprint; Std::iswprint; Std::ispunct; Std::iswpunct; Std::tolower; Std::towlower; Std::toupper; Std::towupper; Std::iswctype; Std::towctrans; Std::wctype; Std::wctrans; Cctype; Cwctype

STD 9      
The STD defining File Transfer Protocol (FTP). (1995-02-07)
999 Plan         
  • Cain supporters with signs celebrating his 9–9–9 plan
TAX REFORM PLAN PROPOSED BY HERMAN CAIN
"9-9-9" plan; 9-9-9 plan; 999 plan; 9–9–9 plan; "9–9–9" plan; 9-9-9 Plan
The 999 Plan was a tax proposal that was a centerpiece of Herman Cain's 2012 campaign for the Republican Party's nomination for president of the United States. It was introduced in August 2011.
AD 9         
YEAR
762 AUC; 9 A.D.; 9 AD; 9 (year); 9 CE; Events in 9; Births in 9; Deaths in 9
AD 9 (IX) was a common year starting on Tuesday of the Julian calendar. In the Roman Empire, it was known as the Year of the Consulship of Sabinus and Camerinus (or, less frequently, 762 Ab urbe condita).

Wikipedia

C character classification

C character classification is an operation provided by a group of functions in the ANSI C Standard Library for the C programming language. These functions are used to test characters for membership in a particular class of characters, such as alphabetic characters, control characters, etc. Both single-byte, and wide characters are supported.