diff options
Diffstat (limited to 'free-fall.lsp')
| -rw-r--r-- | free-fall.lsp | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/free-fall.lsp b/free-fall.lsp index 27dec85..a7cd918 100644 --- a/free-fall.lsp +++ b/free-fall.lsp @@ -1,10 +1,10 @@ ;; TODO: air resistance, terminal velocity -(defconstant +G+ 9.81) +(defconstant +g+ 9.81) (defglobal *alt* 20000) (defglobal *v* 0) (defun step () (setq *alt* (- *alt* *v*)) - (setq *v* (+ *v* +G+)) + (setq *v* (+ *v* +g+)) (format (standard-output) "~A~%" *alt*)) (defun my-main () (while (> *alt* 0) @@ -15,5 +15,5 @@ (format (standard-output) "Gravitational constant: ~A~%" +G+) (format (standard-output) "Twice that: ~A~%" (* 2 +G+)) (let* ((time 10) - (distance (* 0.5 +G+ (expt time 2)))) + (distance (* 0.5 +g+ (expt time 2)))) (format (standard-output) "Distance travelled in 10 seconds of free fall: ~A~%" distance))) |