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#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')); }