From c780cbb6acd0e0526f2d305138190392bdc8cdd7 Mon Sep 17 00:00:00 2001
From: nsfisis <nsfisis@gmail.com>
Date: Sat, 24 Jan 2026 01:43:01 +0900
Subject: refactor: organize test files

---
 tests/functions.c | 142 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 142 insertions(+)
 create mode 100644 tests/functions.c

(limited to 'tests/functions.c')

diff --git a/tests/functions.c b/tests/functions.c
new file mode 100644
index 0000000..e9e622e
--- /dev/null
+++ b/tests/functions.c
@@ -0,0 +1,142 @@
+#include <helpers.h>
+
+int sprintf(char*, const char*, ...);
+int strcmp(const char*, const char*);
+
+int foo() {
+    int i;
+    int ret;
+    i = 0;
+    ret = 0;
+    for (i = 0; i < 100; i = i + 1) {
+        if (i == 12) {
+            break;
+        }
+        ret = ret + i;
+    }
+    return ret;
+}
+
+int f(int a, int b, int c, int d, int e, int f) {
+    return a;
+}
+
+int f2(int a, int b, int c, int d, int e, int f) {
+    return b;
+}
+
+int f3(int a, int b, int c, int d, int e, int f) {
+    return c;
+}
+
+int f4(int a, int b, int c, int d, int e, int f) {
+    return d;
+}
+
+int f5(int a, int b, int c, int d, int e, int f) {
+    return e;
+}
+
+int f6(int a, int b, int c, int d, int e, int f) {
+    return f;
+}
+
+int f7(int select, int a, int b, int c, int d, int e, int f, int g, int h, int i, int j) {
+    switch (select) {
+    case 0:
+        return a;
+    case 1:
+        return b;
+    case 2:
+        return c;
+    case 3:
+        return d;
+    case 4:
+        return e;
+    case 5:
+        return f;
+    case 6:
+        return g;
+    case 7:
+        return h;
+    case 8:
+        return i;
+    case 9:
+        return j;
+    }
+}
+
+char* f8(char* buf, int a, int b, int c, int d, int e, int f, int g, int h, int i, int j) {
+    sprintf(buf, "%d,%d,%d,%d,%d,%d,%d,%d,%d,%d", a, b, c, d, e, f, g, h, i, j);
+    return buf;
+}
+
+typedef struct {
+    long x, y;
+} S;
+
+int f9(int select, int a, int b, int c, int d, S e, int f, int g) {
+    switch (select) {
+    case 0:
+        return a;
+    case 1:
+        return b;
+    case 2:
+        return c;
+    case 3:
+        return d;
+    case 4:
+        return e.x;
+    case 5:
+        return e.y;
+    case 6:
+        return f;
+    case 7:
+        return g;
+    }
+}
+
+// recursive functions
+int fib(int n) {
+    if (n <= 1) {
+        return 1;
+    } else {
+        return fib(n - 1) + fib(n - 2);
+    }
+}
+
+int main() {
+    // function basics
+    ASSERT_EQ(66, foo());
+    ASSERT_EQ(10, 10 * f(1, 2, 3, 4, 5, 6));
+    ASSERT_EQ(20, 10 * f2(1, 2, 3, 4, 5, 6));
+    ASSERT_EQ(30, 10 * f3(1, 2, 3, 4, 5, 6));
+    ASSERT_EQ(40, 10 * f4(1, 2, 3, 4, 5, 6));
+    ASSERT_EQ(50, 10 * f5(1, 2, 3, 4, 5, 6));
+    ASSERT_EQ(60, 10 * f6(1, 2, 3, 4, 5, 6));
+
+    ASSERT_EQ(1, f7(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10));
+    ASSERT_EQ(2, f7(1, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10));
+    ASSERT_EQ(6, f7(5, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10));
+    ASSERT_EQ(7, f7(6, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10));
+    ASSERT_EQ(8, f7(7, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10));
+    ASSERT_EQ(10, f7(9, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10));
+
+    char buf[100];
+    ASSERT_EQ(0, strcmp("1,2,3,4,5,6,7,8,9,10", f8(buf, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10)));
+
+    S s;
+    s.x = 5;
+    s.y = 6;
+    ASSERT_EQ(1, f9(0, 1, 2, 3, 4, s, 7, 8));
+    ASSERT_EQ(2, f9(1, 1, 2, 3, 4, s, 7, 8));
+    ASSERT_EQ(3, f9(2, 1, 2, 3, 4, s, 7, 8));
+    ASSERT_EQ(4, f9(3, 1, 2, 3, 4, s, 7, 8));
+    ASSERT_EQ(5, f9(4, 1, 2, 3, 4, s, 7, 8));
+    ASSERT_EQ(6, f9(5, 1, 2, 3, 4, s, 7, 8));
+    ASSERT_EQ(7, f9(6, 1, 2, 3, 4, s, 7, 8));
+    ASSERT_EQ(8, f9(7, 1, 2, 3, 4, s, 7, 8));
+
+    // recursive functions
+    ASSERT_EQ(89, fib(10));
+}
-- 
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