From aee665f2bc7d66d5e6ecb1e31f9e2ccf614c7fa2 Mon Sep 17 00:00:00 2001
From: Aleksey Veresov <aleksey@veresov.pro>
Date: Mon, 10 Aug 2020 10:59:49 +0300
Subject: Initial commit.

---
 examples/math.c | 70 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 70 insertions(+)
 create mode 100644 examples/math.c

(limited to 'examples/math.c')

diff --git a/examples/math.c b/examples/math.c
new file mode 100644
index 0000000..df0aabc
--- /dev/null
+++ b/examples/math.c
@@ -0,0 +1,70 @@
+#include <csx.h>
+
+
+v def_rat_sum(v construct, v numer, v denom)
+{
+    v a = atom("a");
+    v b = atom("b");
+    return el(define, l(atom("rat_sum"), a, b),
+        l(construct, l(sum, l(mul, l(numer, a), l(denom, b)),
+                            l(mul, l(numer, b), l(denom, a))),
+                     l(mul, l(denom, a), l(denom, b)))
+    );
+}
+
+v def_rat_sum(v construct, v numer, v denom)
+{
+    v a = atom("a");
+    v b = atom("b");
+    return el(define, l(atom("rat_sub"), a, b),
+        l(construct, l(sub, l(mul, l(numer, a), l(denom, b)),
+                            l(mul, l(numer, b), l(denom, a))),
+                     l(mul, l(denom, a), l(denom, b)))
+    );
+}
+
+v def_rat_equ(v construct, v numer, v denom)
+{
+    v a = atom("a");
+    v b = atom("b");
+    return el(define, l(atom("rat_equ"), a, b),
+        l(equ, l(mul, l(numer, a), l(denom, b)),
+               l(mul, l(numer, b), l(denom, a)))
+    );
+}
+
+void printres(v a, v b, v absum, v absub, int *are_equ, v numer, v denom)
+{
+    int an   = *(int *)el(numer, a);
+    int ad   = *(int *)el(denom, a);
+    int bn   = *(int *)el(numer, b);
+    int bd   = *(int *)el(denom, b);
+    int sumn = *(int *)el(numer, absum);
+    int sumd = *(int *)el(denom, absum);
+    int subn = *(int *)el(numer, absub);
+    int subd = *(int *)el(denom, absub);
+    printf("%d/%d + %d/%d = %d/%d\n", an, ad, bn, bd, sumn, sumd);
+    printf("%d/%d - %d/%d = %d/%d\n", an, ad, bn, bd, subn, subd);
+    if (*are_equ) {
+        puts("And they are equal.\n");
+    } else {
+        puts("And they are not equal.\n");
+    }
+}
+
+int main()
+{
+    v rat       = l(define, atom("rat"), cons);
+    v rat_numer = l(define, atom("rat_numer"), car);
+    v rat_denom = l(define, atom("rat_denom"), cdr);
+    v rat_sum   = def_rat_sum(rat, rat_numer, rat_denom);
+    v rat_sub   = def_rat_sub(rat, rat_numer, rat_denom);
+    v rat_equ   = def_rat_equ(rat, rat_numer, rat_denom);
+    v number_a  = el(rat, n(19), n(99));
+    v number_b  = el(rat, n(7), n(3));
+    v absum     = el(rat_sum, number_a, number_b);
+    v absub     = el(rat_sub, number_a, number_b);
+    v are_equ   = el(rat_equ, number_a, number_b);
+    printres(number_a, number_b, sum, sub, are_equ, numer, denom);
+    return 0;
+}
-- 
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