--- /dev/null
+#include <stdlib.h>
+#include <ctype.h>
+
+int main ()
+{
+ char* buf = "hello";
+ return ! ((toupper (buf[0]) == 'H' && toupper ('z') == 'Z' &&
+ tolower (buf[4]) == 'o' && tolower ('X') == 'x' &&
+ isdigit (buf[3])) == 0 && isalnum ('4'));
+}