See the logic here
char boolean[][6]={"TRUE","FALSE"};
printf("%s",boolean[(unsigned int)-1 == ~0]);
(unsigned int)-1// converting -1 to an equivalent unsigned integer value i.e
the max value of unsigned int.
~0 // The bitwise complement operator ~ flips every bit .~0 means all 0 bits
are flips to 1 then here also we get same value as above i.e max value of unsigned int.
Finally (unsigned int)-1== ~0 becomes true and it displays.
First element of boolean array will be printed.
FALSE