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# Perl program to add two numbers using only bitwise operators
# See https://stackoverflow.com/questions/4068033/add-two-integers-usi
+ng-only-bitwise-operators
...
   $sum0 == $sum2 or die "oops 2";
   $sum1 == $sum2 or die "oops 3";
}

0 + 1 = 1 (1 1)
1 + -1 = 0 (0 0)
...
123456789 + 1 = 123456790 (123456790 123456790)
2147483647 + 1 = 2147483648 (2147483648 2147483648)
-2147483648 + 1 = -2147483647 (-2147483647 -2147483647)

// C++ Program to add two numbers without using arithmetic operator.
// bitadd.cpp
...

   return 0; 
}

sizeof my int = 8
0 + 1 = 1 (1)
...
123456789 + 1 = 123456790 (123456790)
2147483647 + 1 = 2147483648 (2147483648)
-2147483648 + 1 = -2147483647 (-2147483647)