The Linux Manuals (man pages) document is an important part of Linux documents. Linux Manuals are organized as several sections. Each section has a group of commands for a specific area in Linux usage, administration or development.
std::islower – std::islower Synopsis Defined in header<cctype> int islower(int ch); Checks if the given character is classified as a lowercase character according to the current C locale. In the default "C" locale, islower returns a nonzero value only for the lowercase letters (abcdefghijklmnopqrstuvwxyz). If islower returns a nonzero value, it is guaranteed that iscntrl, isdigit,…
std::islower(std::locale) – std::islower(std::locale) Synopsis Defined in header<locale> template <class charT> bool islower(charT ch, const locale &loc); Checks if the given character is classified as a lowercase alphabetic character by the given locale’s std::ctype facet. Parameters ch – character loc – locale Return value Returns true if the character is classified as lowercase, false otherwise. Possible…
std::islessgreater – std::islessgreater Synopsis Defined in header <cmath> bool islessgreater( float x, float y ); (1) (since C++11) bool islessgreater( double x, double y ); (2) (since C++11) bool islessgreater( long double x, long double y ); (3) (since C++11) bool islessgreater( Arithmetic x, Arithmetic y ); (4) (since C++11) 1-3) Determines if the floating…
std::islessequal – std::islessequal Synopsis Defined in header <cmath> bool islessequal( float x, float y ); (1) (since C++11) bool islessequal( double x, double y ); (2) (since C++11) bool islessequal( long double x, long double y ); (3) (since C++11) bool islessequal( Arithmetic x, Arithmetic y ); (4) (since C++11) 1-3) Determines if the floating…
std::isless – std::isless Synopsis Defined in header <cmath> bool isless( float x, float y ); (1) (since C++11) bool isless( double x, double y ); (2) (since C++11) bool isless( long double x, long double y ); (3) (since C++11) bool isless( Arithmetic x, Arithmetic y ); (4) (since C++11) 1-3) Determines if the floating…
std::isinf – std::isinf Synopsis Defined in header <cmath> bool isinf( float arg ); (1) (since C++11) bool isinf( double arg ); (2) (since C++11) bool isinf( long double arg ); (3) (since C++11) bool isinf( IntegralType arg ); (4) (since C++11) 1-3) Determines if the given floating point number arg is a positive or negative…
std::isgreaterequal – std::isgreaterequal Synopsis Defined in header <cmath> bool isgreaterequal( float x, float y ); (1) (since C++11) bool isgreaterequal( double x, double y ); (2) (since C++11) bool isgreaterequal( long double x, long double y ); (3) (since C++11) bool isgreaterequal( Arithmetic x, Arithmetic y ); (4) (since C++11) 1-3) Determines if the floating…
std::isgreater – std::isgreater Synopsis Defined in header <cmath> bool isgreater( float x, float y ); (1) (since C++11) bool isgreater( double x, double y ); (2) (since C++11) bool isgreater( long double x, long double y ); (3) (since C++11) bool isgreater( Arithmetic x, Arithmetic y ); (4) (since C++11) 1-3) Determines if the floating…
std::isgraph – std::isgraph Synopsis Defined in header<cctype> int isgraph(int ch); Checks if the given character is graphic (has a graphical representation) as classified by the currently installed C locale. In the default C locale, the following characters are graphic: * digits (0123456789) * uppercase letters (ABCDEFGHIJKLMNOPQRSTUVWXYZ) * lowercase letters (abcdefghijklmnopqrstuvwxyz) * punctuation characters (!"#$%&'()*+,-./:;<=>?@[\]^_`{|}~) The…
std::isgraph(std::locale) – std::isgraph(std::locale) Synopsis Defined in header<locale> template <class charT> bool isgraph(charT ch, const locale &loc); Checks if the given character classified as a graphic character (i.e. printable, excluding space) by the given locale’s std::ctype facet. Parameters ch – character loc – locale Return value Returns true if the character is classified as graphic, false…
std::isfinite – std::isfinite Synopsis Defined in header <cmath> bool isfinite( float arg ); (1) (since C++11) bool isfinite( double arg ); (2) (since C++11) bool isfinite( long double arg ); (3) (since C++11) bool isfinite( IntegralType arg ); (4) (since C++11) 1-3) Determines if the given floating point number arg has finite value i.e. it…
std::isdigit – std::isdigit Synopsis Defined in header<cctype> int isdigit(int ch); Checks if the given character is one of the 10 decimal digits: 0123456789. The behavior is undefined if the value of ch is not representable as unsigned char and is not equal to EOF. Parameters ch – character to classify Return value Non-zero value if…
std::isdigit(std::locale) – std::isdigit(std::locale) Synopsis Defined in header<locale> template <class charT> bool isdigit(charT ch, const locale &loc); Checks if the given character is classified as a digit by the given locale’s std::ctype facet. Parameters ch – character loc – locale Return value Returns true if the character is classified as a digit, false otherwise. Possible implementation…
std::iscntrl – std::iscntrl Synopsis Defined in header<cctype> int iscntrl(int ch); Checks if the given character is a control character as classified by the currently installed C locale. In the default, "C" locale, the control characters are the characters with the codes 0x00-0x1F and 0x7F. The behavior is undefined if the value of ch is not…
std::iscntrl(std::locale) – std::iscntrl(std::locale) Synopsis Defined in header<locale> template <class charT> bool iscntrl(charT ch, const locale &loc); Checks if the given character is classified as a control character by the given locale’s std::ctype facet. Parameters ch – character loc – locale Return value Returns true if the character is classified as a control character, false otherwise….
std::isblank – std::isblank Synopsis Defined in header <cctype> int isblank( int ch ); (since C++11) Checks if the given character is a blank character as classified by the currently installed C locale. Blank characters are whitespace characters used to separate words within a sentence. In the default C locale, only space (0x20) and horizontal tab…
std::isblank(std::locale) – std::isblank(std::locale) Synopsis Defined in header<locale> template <class charT> (since C++ 11) bool isblank(charT ch, const locale &loc); Checks if the given character is classified as a blank character by the given locale’s ctype facet. Parameters ch – character loc – locale Return value Returns true if the character is classified as a blank…
std::isalpha – std::isalpha Synopsis Defined in header<cctype> int isalpha(int ch); Checks if the given character is an alphabetic character as classified by the currently installed C locale. In the default locale, the following characters are alphabetic: * uppercase letters ABCDEFGHIJKLMNOPQRSTUVWXYZ * lowercase letters abcdefghijklmnopqrstuvwxyz In locales other than "C", an alphabetic character is a character…
std::isalpha(std::locale) – std::isalpha(std::locale) Synopsis Defined in header<locale> template <class charT> bool isalpha(charT ch, const locale &loc); Checks if the given character is classified as an alphabetic character by the given locale’s std::ctype facet. Parameters ch – character loc – locale Return value Returns true if the character is classified as alphabetic, false otherwise. Possible implementation…
std::isalnum – std::isalnum Synopsis Defined in header<cctype> int isalnum(int ch); Checks if the given character is an alphanumeric character as classified by the current C locale. In the default locale, the following characters are alphanumeric: * digits (0123456789) * uppercase letters (ABCDEFGHIJKLMNOPQRSTUVWXYZ) * lowercase letters (abcdefghijklmnopqrstuvwxyz) The behavior is undefined if the value of ch…