{{keywords>wiki library source code example reference}} ===== isxdigit ===== int isxdigit(int chr); checks whether a character is hexadecimal ===== C Sourcecode Example ===== #include /* including standard library */ //#include /* uncomment this for Windows */ #include 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; } ==== output ==== user@host:~$ ./isxdigit Character 1 is a xdigit Character 9 is a xdigit