Currency: Difference between revisions
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imported>GoulashAmateur (Add Common Lisp version) |
imported>GoulashAmateur m (Common Lisp syntax tweaks) |
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=={{header|Common Lisp}}== |
=={{header|Common Lisp}}== |
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Let us just use the built-in and convenient rationals (which |
Let us just use the built-in and convenient rationals (which use two bignums for numerator and denominator). |
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<syntaxhighlight lang="lisp">(defun print-$ (rat &key (prefix "") (stream t)) |
<syntaxhighlight lang="lisp">(defun print-$ (rat &key (prefix "") (stream t)) |
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(defun compute-check (order-alist tax-rate) |
(defun compute-check (order-alist tax-rate) |
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(let* ((total-before-tax |
(let* ((total-before-tax |
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(loop for (amount . price) in order-alist |
(loop :for (amount . price) in order-alist |
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sum (* (rationalize price) amount))) |
:sum (* (rationalize price) amount))) |
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(tax (* (rationalize tax-rate) total-before-tax))) |
(tax (* (rationalize tax-rate) total-before-tax))) |
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(print-$ total-before-tax :prefix "Total before tax: ") |
(print-$ total-before-tax :prefix "Total before tax: ") |
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(defun compute-check (order-alist tax-rate) |
(defun compute-check (order-alist tax-rate) |
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(let* ((total-before-tax |
(let* ((total-before-tax |
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(loop for (amount . price) in order-alist |
(loop :for (amount . price) in order-alist |
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sum (* price amount))) |
:sum (* price amount))) |
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(tax (* (rationalize tax-rate) total-before-tax))) |
(tax (* (rationalize tax-rate) total-before-tax))) |
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(print-$ total-before-tax :prefix "Total before tax: ") |
(print-$ total-before-tax :prefix "Total before tax: ") |
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