diff options
Diffstat (limited to 'coding-exercises/2/78')
| -rw-r--r-- | coding-exercises/2/78/install-complex-package.rkt | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/coding-exercises/2/78/install-complex-package.rkt b/coding-exercises/2/78/install-complex-package.rkt index e332351..335eacd 100644 --- a/coding-exercises/2/78/install-complex-package.rkt +++ b/coding-exercises/2/78/install-complex-package.rkt @@ -53,6 +53,9 @@ (put 'add '(complex complex) (lambda (z1 z2) (typetag (add-complex z1 z2)))) + (put 'neg '(complex) + (lambda (z) (typetag (make-from-real-imag (- (real-part z)) + (- (imag-part z)))))) (put 'sub '(complex complex) (lambda (z1 z2) (typetag (sub-complex z1 z2)))) (put 'mul '(complex complex) |