From 9d9904f3dc113e170b9a8d9c3d0c9edba7dd68ab Mon Sep 17 00:00:00 2001
From: YdrMaster <ydrml@hotmail.com>
Date: Mon, 8 Jul 2024 12:54:49 +0800
Subject: [PATCH] =?UTF-8?q?update:=20=E6=B7=BB=E5=8A=A0=E9=A2=98=E7=9B=AE?=
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Signed-off-by: YdrMaster <ydrml@hotmail.com>
---
 exercises/04_static/main.cpp    |  2 --
 exercises/05_constexpr/main.cpp |  2 --
 exercises/06_loop/main.cpp      | 15 +++++++++++++++
 exercises/07_struct/main.cpp    | 25 +++++++++++++++++++++++++
 exercises/08_class/main.cpp     | 26 ++++++++++++++++++++++++++
 xmake.lua                       | 12 ++++++++++++
 6 files changed, 78 insertions(+), 4 deletions(-)
 create mode 100644 exercises/06_loop/main.cpp
 create mode 100644 exercises/07_struct/main.cpp
 create mode 100644 exercises/08_class/main.cpp

diff --git a/exercises/04_static/main.cpp b/exercises/04_static/main.cpp
index 460a9a10d..c5a13051b 100644
--- a/exercises/04_static/main.cpp
+++ b/exercises/04_static/main.cpp
@@ -1,5 +1,3 @@
-// See <https://stackoverflow.com/questions/156767/whats-the-difference-between-an-argument-and-a-parameter>.
-
 #include <iostream>
 
 void func(int param) {
diff --git a/exercises/05_constexpr/main.cpp b/exercises/05_constexpr/main.cpp
index ade4e5425..c7814686d 100644
--- a/exercises/05_constexpr/main.cpp
+++ b/exercises/05_constexpr/main.cpp
@@ -1,5 +1,3 @@
-// See <https://stackoverflow.com/questions/156767/whats-the-difference-between-an-argument-and-a-parameter>.
-
 #include <iostream>
 
 constexpr int fibonacci(int i) {
diff --git a/exercises/06_loop/main.cpp b/exercises/06_loop/main.cpp
new file mode 100644
index 000000000..05bca573b
--- /dev/null
+++ b/exercises/06_loop/main.cpp
@@ -0,0 +1,15 @@
+#include <iostream>
+
+unsigned long long fibonacci(int i) {
+    static unsigned long long cache[128]{0, 1}, next = 2;
+    for (; next <= i; ++next) {
+        cache[next] = cache[next - 1] + cache[next - 2];
+    }
+    return cache[i];
+}
+
+int main(int argc, char **argv) {
+    auto fib100 = fibonacci(100);
+    std::cout << "fibonacci(100) = " << fib100 << std::endl;
+    return 0;
+}
diff --git a/exercises/07_struct/main.cpp b/exercises/07_struct/main.cpp
new file mode 100644
index 000000000..3fb4ff62d
--- /dev/null
+++ b/exercises/07_struct/main.cpp
@@ -0,0 +1,25 @@
+#include <iostream>
+
+struct Fibonacci {
+    size_t cache[128];
+    int next = 2;
+
+    Fibonacci() : cache{0, 1}, next(2) {}
+    ~Fibonacci() {
+        std::cout << "Drop Fibonacci with next = " << next << std::endl;
+    }
+
+    size_t operator[](int i) {
+        for (; next <= i; ++next) {
+            cache[next] = cache[next - 1] + cache[next - 2];
+        }
+        return cache[i];
+    }
+};
+
+int main(int argc, char **argv) {
+    Fibonacci fib0, fib1;
+    std::cout << "fibonacci(10) = " << fib0[10] << std::endl;
+    std::cout << "fibonacci(100) = " << fib1[100] << std::endl;
+    return 0;
+}
diff --git a/exercises/08_class/main.cpp b/exercises/08_class/main.cpp
new file mode 100644
index 000000000..1be69eb70
--- /dev/null
+++ b/exercises/08_class/main.cpp
@@ -0,0 +1,26 @@
+#include <iostream>
+
+class Fibonacci {
+    size_t cache[128];
+    int next = 2;
+
+public:
+    Fibonacci() : cache{0, 1}, next(2) {}
+    ~Fibonacci() {
+        std::cout << "Drop Fibonacci with next = " << next << std::endl;
+    }
+
+    size_t operator[](int i) {
+        for (; next <= i; ++next) {
+            cache[next] = cache[next - 1] + cache[next - 2];
+        }
+        return cache[i];
+    }
+};
+
+int main(int argc, char **argv) {
+    Fibonacci fib0, fib1;
+    std::cout << "fibonacci(10) = " << fib0[10] << std::endl;
+    std::cout << "fibonacci(100) = " << fib1[100] << std::endl;
+    return 0;
+}
diff --git a/xmake.lua b/xmake.lua
index 6d04ef8c8..3ff40e4e1 100644
--- a/xmake.lua
+++ b/xmake.lua
@@ -24,3 +24,15 @@ target("exercise04")
 target("exercise05")
     set_kind("binary")
     add_files("exercises/05_constexpr/main.cpp")
+
+target("exercise06")
+    set_kind("binary")
+    add_files("exercises/06_loop/main.cpp")
+
+target("exercise07")
+    set_kind("binary")
+    add_files("exercises/07_struct/main.cpp")
+
+target("exercise08")
+    set_kind("binary")
+    add_files("exercises/08_class/main.cpp")