c:math:hexchk

C++ Reference

int hexchk(char *chr) {

int c;
while (*chr != '\0') {
	c=*chr++;
	//printf("%d,%c%x\r\n", c,c,c);
	//if      (c == ' ') continue;
	//else if (c >= '0' && c <= '9') continue;
	//else if (c >= 'a' && c <= 'f') continue;
	//else if (c >= 'A' && c <= 'F') continue;
	if (c >= '0' && c <= '9') continue;
	else return 1;
}
return 0;

}