https://code-reference.com/ 2026-06-21T06:38:46+02:00 https://code-reference.com/ https://code-reference.com/ttps://code-reference.com/lib/tpl/dokuwiki/images/favicon.ico text/html 2024-02-16T01:04:35+02:00 https://code-reference.com/cpp/cctype/isalnum?rev=1708041875&do=diff int isalnum(int chr); check if a character Alphanumeric cpp Sourcecode Example #include <iostream> /* including standard library */ #include <string> #include <cctype> using namespace std; int main () { int i; string str="Test -!&%1"; for (i=0; i <= 11;i++) { if ( isalnum(str[i]) != 0 ) { cout << "Character " << i << " is alphanumeric" << endl; } } return 0; } text/html 2024-02-16T01:04:35+02:00 https://code-reference.com/cpp/cctype/isalpha?rev=1708041875&do=diff int isalpha(int chr); check if a character Alphabetical cpp Sourcecode Example #include <iostream> /* including standard library */ #include <string> #include <cctype> using namespace std; int main ( void ) { int i; string str="Test -!&%1"; for (i=0; i <= 11;i++) { if ( isalpha(str[i]) != 0 ) { cout << "Character " << i << " is alphabetical" << endl; } } return 0; } text/html 2024-02-16T01:04:34+02:00 https://code-reference.com/cpp/cctype/isascii?rev=1708041874&do=diff int isascii(int char); a macro that tests if a char a ASCII char (0-127) is cpp Sourcecode Example /* * isascii example code * http://code-reference.com/cpp/cctype/isascii */ #include <iostream> /* including standard library */ #include <string> #include <cctype> using namespace std; int main ( void ) { int i; string str="Test ÖÄ%1"; for (i=0; i <= 11;i++) { if ( isascii(str) != 0 ) { cout << "character" << i << " isascii" << endl; } } return … text/html 2024-02-16T01:04:34+02:00 https://code-reference.com/cpp/cctype/isblank?rev=1708041874&do=diff isblank int isblank(int chr); Test if a char a space, only in C99 Compilers available isblank #include <iostream> /* including standard library */ #include <string> #include <cctype> using namespace std; int main ( void ) { int i; string str="Test -!&%1"; for (i=0; i <= 11;i++) { if ( isblank(str[i]) != 0 ) { cout << "Character " << i << " is a blank char" << endl; } } return 0; } text/html 2024-02-16T01:04:34+02:00 https://code-reference.com/cpp/cctype/iscntrl?rev=1708041874&do=diff iscntrl int iscntrl(int chr); Tests if a character a control character cpp Sourcecode Example #include <iostream> /* including standard library */ #include <string> #include <cctype> using namespace std; int main ( void ) { int i; string str="Test\n-!&%1"; for (i=0; i <= 11;i++) { if ( iscntrl(str[i]) != 0 ) { cout << "Character " << i << " is a control char" << endl; } } return 0; } text/html 2024-02-16T01:04:34+02:00 https://code-reference.com/cpp/cctype/isdigit?rev=1708041874&do=diff isdigit int isdigit(int chr); tests if a character a digit cpp Sourcecode Example #include <iostream> /* including standard library */ #include <string> #include <cctype> using namespace std; int main ( void ) { int i; string str="Test\n-!&%1"; for (i=0; i <= 11;i++) { if ( isdigit(str[i]) != 0 ) { cout << "Character " << i << " is a digit" << endl; } } return 0; } text/html 2024-02-16T01:04:33+02:00 https://code-reference.com/cpp/cctype/isgraph?rev=1708041873&do=diff isgraph int isgraph(int chr); checks for any printing character except space (' ') cpp Sourcecode Example #include <iostream> /* including standard library */ #include <string> #include <cctype> using namespace std; int main ( void ) { int i; string str="Test\n-!&%1"; for (i=0; i <= 11;i++) { if ( isgraph(str[i]) != 0 ) { cout << "Character " << i << " is a graph" << endl; } } return 0; } text/html 2024-02-16T01:04:35+02:00 https://code-reference.com/cpp/cctype/islower?rev=1708041875&do=diff islower int islower(int chr); checks whether a character is lowercase cpp Sourcecode Example #include <iostream> /* including standard library */ #include <string> #include <cctype> using namespace std; int main ( void ) { int i; string str="Test -!&%1"; for (i=0; i <= 11;i++) { if ( islower(str[i]) != 0 ) { cout << "Character " << i << " is a lower char" << endl; } } return 0; } text/html 2024-02-16T01:04:33+02:00 https://code-reference.com/cpp/cctype/isprint?rev=1708041873&do=diff isprint int isprint(int chr); tests if character is printable cpp Sourcecode Example #include <iostream> /* including standard library */ #include <string> #include <cctype> using namespace std; int main ( void ) { int i; string str="Test -!&%1"; for (i=0; i <= 11;i++) { if ( isprint(str[i]) != 0 ) { cout << "Character " << i << " is printable char" << endl; } } return 0; } text/html 2024-02-16T01:04:34+02:00 https://code-reference.com/cpp/cctype/ispunct?rev=1708041874&do=diff ispunct int ispunct(int chr); tests whether a character is punctuation mark cpp Sourcecode Example #include <iostream> /* including standard library */ #include <string> #include <cctype> using namespace std; int main ( void ) { int i; string str="Test -!&%1"; for (i=0; i <= 11;i++) { if ( ispunct(str[i]) != 0 ) { cout << "Character " << i << " is a punctuation mark" << endl; } } return 0; } text/html 2024-02-16T01:04:34+02:00 https://code-reference.com/cpp/cctype/isspace?rev=1708041874&do=diff isspace int isspace(int chr); checks whether a character a space cpp Sourcecode Example #include <iostream> /* including standard library */ #include <string> #include <cctype> using namespace std; int main ( void ) { int i; string str="Test -!&%1"; for (i=0; i <= 11;i++) { if ( isspace(str[i]) != 0 ) { cout << "Character " << i << " is a space" << endl; } } return 0; } text/html 2024-02-16T01:04:34+02:00 https://code-reference.com/cpp/cctype/isupper?rev=1708041874&do=diff isupper int isupper(int chr); tests wheather a char is in uppercase cpp Sourcecode Example #include <iostream> /* including standard library */ #include <string> #include <cctype> using namespace std; int main ( void ) { int i; string str="Test -!&%1"; for (i=0; i <= 11;i++) { if ( isupper(str[i]) != 0 ) { cout << "Character " << i << " is uppercase" << endl; } } return 0; } text/html 2024-02-16T01:04:35+02:00 https://code-reference.com/cpp/cctype/isxdigit?rev=1708041875&do=diff int isxdigit(int chr); checks whether a character is hexadecimal cpp Sourcecode Example #include <iostream> /* including standard library */ #include <string> #include <cctype> using namespace std; int main ( void ) { int i; string str="Test -!&%1"; for (i=0; i <= 11;i++) { if ( isxdigit(str[i]) != 0 ) { cout << "Character " << i << " is a xdigit" << endl; } } return 0; } text/html 2024-02-16T01:04:34+02:00 https://code-reference.com/cpp/cctype/toascii?rev=1708041874&do=diff toascii int toascii (int c); a macro thats convert c into ascii chars cpp Sourcecode Example #include <iostream> /* including standard library */ #include <cctype> using namespace std; int main( void ) { int i; for (i=0x2a; i<=0x42; i++) { cout << i << " is " << static_cast<char>(toascii(i)) << endl; } } text/html 2024-02-16T01:04:34+02:00 https://code-reference.com/cpp/cctype/tolower?rev=1708041874&do=diff #include <cctype> int tolower( int char ); Returns lower case type of the character cpp Sourcecode Example #include <iostream> /* including standard library */ #include <cctype> using namespace std; int main ( void ) { /* convert the Chars "I" and "T" to lowercase */ cout << static_cast<char>(tolower('I')) << " WHANT " << static_cast<char>(tolower('T')) << "HIS IN LOWERCASE" << endl; return 0; } text/html 2024-02-16T01:04:35+02:00 https://code-reference.com/cpp/cctype/toupper?rev=1708041875&do=diff toupper #include <cctype> int toupper( int char ); Returns upper case type of the character cpp Sourcecode Example #include <iostream> /* including standard library */ #include <cctype> using namespace std; int main ( void ) { /* convert the Chars "i" and "t" uppercase */ cout << static_cast<char>(toupper('i')) << " whant " << static_cast<char>(toupper('t')) << "his in uppercase" << endl; return 0; }