Data update

Task/Twos-complement/Racket/twos-complement.rkt

@@ -0,0 +1,9 @@
+#lang racket/base
+
+(define (main)
+  (let ([n 42])
+    (printf "n = ~a, -n = ~a, two's complement = ~a\n"
+            n (- n) (add1 (bitwise-not n)))))
+
+(module+ main
+  (main))

Task/Twos-complement/X86-64-Assembly/twos-complement.x86-64

@@ -0,0 +1,5 @@
+    mov rax, 1968  ;  1968 in rax
+    neg rax        ; -1968 should be in rax
+;------------------
+    not rax
+    inc rax        ;  1968 should be in rax again.