From d4976912beceb70a110050f212d5a1f17f974f17 Mon Sep 17 00:00:00 2001
From: Sam Anthony <sam@samanthony.xyz>
Date: Fri, 28 Feb 2025 15:23:05 -0500
Subject: volume unit conversion functions

---
 test_volume.c | 16 ++++++++--------
 unit.c        | 47 +++++++++++++++++++++++++++++++++++++++--------
 2 files changed, 47 insertions(+), 16 deletions(-)

diff --git a/test_volume.c b/test_volume.c
index 1dac319..84b29a0 100644
--- a/test_volume.c
+++ b/test_volume.c
@@ -6,40 +6,40 @@
 
 void
 test_cubic_centimetre(void) {
-	assert(0);
+	test(cubic_centimetre(123.456), 0.000123456);
 }
 
 void
 test_litre(void) {
-	assert(0);
+	test(litre(123.456), 0.123456);
 }
 
 void
 test_cubic_metre(void) {
-	assert(0);
+	test(cubic_metre(123.456), 123.456);
 }
 
 void
 test_cubic_inch(void) {
-	assert(0);
+	test(cubic_inch(123.456), 0.0020230814);
 }
 
 void
 test_as_cubic_centimetre(void) {
-	assert(0);
+	test(as_cubic_centimetre(cubic_centimetre(123.456)), 123.456);
 }
 
 void
 test_as_litre(void) {
-	assert(0);
+	test(as_litre(litre(123.456)), 123.456);
 }
 
 void
 test_as_cubic_metre(void) {
-	assert(0);
+	test(as_cubic_metre(cubic_metre(123.456)), 123.456);
 }
 
 void
 test_as_cubic_inch(void) {
-	assert(0);
+	test(as_cubic_inch(cubic_inch(123.456)), 123.456);
 }
diff --git a/unit.c b/unit.c
index 702f56c..fde768f 100644
--- a/unit.c
+++ b/unit.c
@@ -45,11 +45,42 @@ double as_bar(Pressure x);
 double as_psi(Pressure x);
 
 
-Volume cubic_centimetre(double x);
-Volume litre(double x);
-Volume cubic_metre(double x);
-Volume cubic_inch(double x);
-double as_cubic_centimetre(Volume x);
-double as_litre(Volume x);
-double as_cubic_metre(double x);
-double as_cubic_inch(double x);
+Volume
+cubic_centimetre(double x) {
+	return x * 1e-6;
+}
+
+Volume
+litre(double x) {
+	return x * 1e-3;
+}
+
+Volume
+cubic_metre(double x) {
+	return x;
+}
+
+Volume
+cubic_inch(double x) {
+	return x * 1.6387064e-5;
+}
+
+double
+as_cubic_centimetre(Volume x) {
+	return x * 1e6;
+}
+
+double
+as_litre(Volume x) {
+	return x * 1e3;
+}
+
+double
+as_cubic_metre(double x) {
+	return x;
+}
+
+double
+as_cubic_inch(double x) {
+	return x / 1.6387064e-5;
+}
-- 
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