https://code-reference.com/ 2026-06-21T05:42:57+02:00 https://code-reference.com/ https://code-reference.com/ttps://code-reference.com/lib/tpl/dokuwiki/images/favicon.ico text/html 2024-02-16T01:05:22+02:00 https://code-reference.com/c/ctype.h/digittoint?rev=1708041922&do=diff description of digittoint digittoint is in work by code-reference.com if you are faster... don't hasitate and add it no example at the moment output of digittoint c example no example at the moment text/html 2024-02-16T01:05:23+02:00 https://code-reference.com/c/ctype.h/isalnum?rev=1708041923&do=diff isalnum int isalnum(int chr); check if a character Alphanumeric C Sourcecode Example #include <stdio.h> /* including standard library */ //#include <windows.h> /* uncomment this for Windows */ #include <ctype.h> int main () { int i; char string[11]="Test -!&%1"; for (i=0; i <= 11;i++) { if ( isalnum(string[i]) != 0 ) { printf("Character %i is alphanumeric\n",i); } } return 0; } text/html 2024-02-16T01:05:23+02:00 https://code-reference.com/c/ctype.h/isalpha?rev=1708041923&do=diff isalpha int isalpha(int chr); check if a character Alphabetical C Sourcecode Example #include <stdio.h> /* including standard library */ //#include <windows.h> /* uncomment this for Windows */ #include <ctype.h> int main () { int i; char string[11]="Test -!&%1"; for (i=0; i <= 11;i++) { if ( isalpha(string[i]) != 0 ) { printf("Character %i is alphabetical\n",i); } } return 0; } text/html 2024-02-16T01:05:22+02:00 https://code-reference.com/c/ctype.h/isascii?rev=1708041922&do=diff isascii int isascii(int char); a macro that tests if a char a ASCII char (0-127) is C Sourcecode Example /* * isascii example code * http://code-reference.com/c/ctype.h/isascii */ #include <stdio.h> /* including standard library */ //#include <windows.h> /* uncomment this for Windows */ #include <ctype.h> int main ( void ) { int i; char string[11]="Test ÖÄ%1"; for (i=0; i <= 11;i++) { if ( isascii(string[i]) != 0 ) { printf("character %i isascii ch… text/html 2024-02-16T01:05:23+02:00 https://code-reference.com/c/ctype.h/isblank?rev=1708041923&do=diff isblank int isblank(int chr); Test if a char a space, only in C99 Compilers available isblank #include <stdio.h> /* including standard library */ //#include <windows.h> /* uncomment this for Windows */ #include <ctype.h> int main ( void ) { int i; char string[11]="Test -!&%1"; for (i=0; i <= 11;i++) { if ( isblank(string[i]) != 0 ) { printf("Character %i is a blank char\n",i); } } return 0; } text/html 2024-02-16T01:05:23+02:00 https://code-reference.com/c/ctype.h/iscntrl?rev=1708041923&do=diff iscntrl int iscntrl(int chr); Tests if a character a control character C Sourcecode Example #include <stdio.h> /* including standard library */ //#include <windows.h> /* uncomment this for Windows */ #include <ctype.h> int main ( void ) { int i; char string[11]="Test\n-!&%1"; for (i=0; i <= 11;i++) { if ( iscntrl(string[i]) != 0 ) { printf("Character %i is a control char\n",i); } } return 0; } text/html 2024-02-16T01:05:22+02:00 https://code-reference.com/c/ctype.h/isdigit?rev=1708041922&do=diff int isdigit(int chr); tests if a character a digit C Sourcecode Example #include <stdio.h> /* including standard library */ //#include <windows.h> /* uncomment this for Windows */ #include <ctype.h> int main ( void ) { int i; char string[11]="Test\n-!&%1"; for (i=0; i <= 11;i++) { if ( isdigit(string[i]) != 0 ) { printf("Character %i is a digit\n",i); } } return 0; } text/html 2024-02-16T01:05:22+02:00 https://code-reference.com/c/ctype.h/isgraph?rev=1708041922&do=diff isgraph int isgraph(int chr); checks for any printing character except space (' ') C Sourcecode Example #include <stdio.h> /* including standard library */ //#include <windows.h> /* uncomment this for Windows */ #include <ctype.h> int main ( void ) { int i; char string[11]="Test\n-!&%1"; for (i=0; i <= 11;i++) { if ( isgraph(string[i]) != 0 ) { printf("Character %i is a graph\n",i); } } return 0; } text/html 2024-02-16T01:05:24+02:00 https://code-reference.com/c/ctype.h/islower?rev=1708041924&do=diff islower int islower(int chr); checks whether a character is lowercase C Sourcecode Example #include <stdio.h> /* including standard library */ //#include <windows.h> /* uncomment this for Windows */ #include <ctype.h> int main ( void ) { int i; char string[11]="Test -!&%1"; for (i=0; i <= 11;i++) { if ( islower(string[i]) != 0 ) { printf("Character %i is a lower char\n",i); } } return 0; } text/html 2024-02-16T01:05:22+02:00 https://code-reference.com/c/ctype.h/isprint?rev=1708041922&do=diff isprint int isprint(int chr); tests if character is printable C Sourcecode Example #include <stdio.h> /* including standard library */ //#include <windows.h> /* uncomment this for Windows */ #include <ctype.h> int main ( void ) { int i; char string[11]="Test -!&%1"; for (i=0; i <= 11;i++) { if ( isprint(string[i]) != 0 ) { printf("Character %i is printable char\n",i); } } return 0; } text/html 2024-02-16T01:05:23+02:00 https://code-reference.com/c/ctype.h/ispunct?rev=1708041923&do=diff ispunct int ispunct(int chr); tests whether a character is punctuation mark C Sourcecode Example #include <stdio.h> /* including standard library */ //#include <windows.h> /* uncomment this for Windows */ #include <ctype.h> int main ( void ) { int i; char string[11]="Test -!&%1"; for (i=0; i <= 11;i++) { if ( ispunct(string[i]) != 0 ) { printf("Character %i is a punctuation mark\n",i); } } return 0; } text/html 2024-02-16T01:05:23+02:00 https://code-reference.com/c/ctype.h/isspace?rev=1708041923&do=diff isspace int isspace(int chr); checks whether a character a space C Sourcecode Example #include <stdio.h> /* including standard library */ //#include <windows.h> /* uncomment this for Windows */ #include <ctype.h> int main ( void ) { int i; char string[11]="Test -!&%1"; for (i=0; i <= 11;i++) { if ( isspace(string[i]) != 0 ) { printf("Character %i is a space\n",i); } } return 0; } text/html 2024-02-16T01:05:23+02:00 https://code-reference.com/c/ctype.h/isupper?rev=1708041923&do=diff isupper int isupper(int chr); tests wheather a char is in uppercase C Sourcecode Example #include <stdio.h> /* including standard library */ //#include <windows.h> /* uncomment this for Windows */ #include <ctype.h> int main ( void ) { int i; char string[11]="Test -!&%1"; for (i=0; i <= 11;i++) { if ( isupper(string[i]) != 0 ) { printf("Character %i is uppercase\n",i); } } return 0; } text/html 2024-02-16T01:05:24+02:00 https://code-reference.com/c/ctype.h/isxdigit?rev=1708041924&do=diff isxdigit int isxdigit(int chr); checks whether a character is hexadecimal C Sourcecode Example #include <stdio.h> /* including standard library */ //#include <windows.h> /* uncomment this for Windows */ #include <ctype.h> int main ( void ) { int i; char string[11]="Test -!&%1"; for (i=0; i <= 11;i++) { if ( isxdigit(string[i]) != 0 ) { printf("Character %i is a xdigit\n",i); } } return 0; } text/html 2024-02-16T01:05:23+02:00 https://code-reference.com/c/ctype.h/toascii?rev=1708041923&do=diff toascii int toascii (int c); a macro thats convert c into ascii chars C Sourcecode Example #include <stdio.h> /* including standard library */ //#include <windows.h> /* uncomment this for Windows */ #include <ctype.h> void main(void) { int i; for (i=0x2a; i<=0x42; i++) { printf("%#04x is %c\n", i, toascii(i)); } } text/html 2024-02-16T01:05:23+02:00 https://code-reference.com/c/ctype.h/tolower?rev=1708041923&do=diff #include <ctype.h> int tolower( int char ); Returns lower case type of the character C Sourcecode Example #include <stdio.h> /* including standard library */ //#include <windows.h> /* uncomment this for Windows */ #include <ctype.h> int main ( void ) { char string[30]; /* write the Chars "i" and "t" lowercase in the buffer "string" */ sprintf(string,"%c WHANT %cHIS IN LOWERCASE",tolower('I'), tolower('T')); printf("%s\n",string); return 0; } text/html 2024-02-16T01:05:24+02:00 https://code-reference.com/c/ctype.h/toupper?rev=1708041924&do=diff toupper #include <ctype.h> int toupper( int char ); Returns upper case type of the character C Sourcecode Example #include <stdio.h> /* including standard library */ //#include <windows.h> /* uncomment this for Windows */ #include <ctype.h> int main ( void ) { char string[30]; /* write the Chars "i" and "t" uppercase in the buffer "string" */ sprintf(string,"%c whant %chis in uppercase",toupper('i'), toupper('t')); printf("%s\n",string); return 0; }