From e8fdb609fe03969a81c60510cb0ea4657d33ef16 Mon Sep 17 00:00:00 2001
From: flykhan <liubo666666@outlook.com>
Date: Wed, 12 Jul 2023 23:16:19 +0800
Subject: [PATCH] =?UTF-8?q?day8=20homework:=20=E5=8A=A8=E6=80=81=E5=BA=93?=
 =?UTF-8?q?=E7=9A=84=E7=94=9F=E6=88=90=E5=92=8C=E4=BD=BF=E7=94=A8=E9=A2=98?=
 =?UTF-8?q?=E7=9B=AE=E7=BB=83=E4=B9=A0?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 day8/homework/h1/README.md       |  32 +++++++++++++++++++++++++++++++
 day8/homework/h1/includes/a.h    |   6 ++++++
 day8/homework/h1/includes/b.h    |   6 ++++++
 day8/homework/h1/libs/liba.so    | Bin 0 -> 7976 bytes
 day8/homework/h1/libs/libb.so    | Bin 0 -> 7872 bytes
 day8/homework/h1/tempfiles/a.c   |  10 ++++++++++
 day8/homework/h1/tempfiles/a.h   |   6 ++++++
 day8/homework/h1/tempfiles/b.c   |  20 +++++++++++++++++++
 day8/homework/h1/tempfiles/b.h   |   6 ++++++
 day8/homework/h1/testArrSort.c   |  24 +++++++++++++++++++++++
 day8/homework/h1/testFactorial.c |  11 +++++++++++
 11 files changed, 121 insertions(+)
 create mode 100644 day8/homework/h1/README.md
 create mode 100644 day8/homework/h1/includes/a.h
 create mode 100644 day8/homework/h1/includes/b.h
 create mode 100755 day8/homework/h1/libs/liba.so
 create mode 100755 day8/homework/h1/libs/libb.so
 create mode 100644 day8/homework/h1/tempfiles/a.c
 create mode 100644 day8/homework/h1/tempfiles/a.h
 create mode 100644 day8/homework/h1/tempfiles/b.c
 create mode 100644 day8/homework/h1/tempfiles/b.h
 create mode 100644 day8/homework/h1/testArrSort.c
 create mode 100644 day8/homework/h1/testFactorial.c

diff --git a/day8/homework/h1/README.md b/day8/homework/h1/README.md
new file mode 100644
index 0000000..c095e0b
--- /dev/null
+++ b/day8/homework/h1/README.md
@@ -0,0 +1,32 @@
+**#### 题目要求: 创建 a.h、a.c,、b.h、b.c 四个文件，在 a 文件中创建求阶乘函数并实现，在 b 文件中创建数组的排序函数并实现，要求将 a,b 编译成动态库文件。并编写 test.c 文件，引入 a 和 b 两个文件的功能并编译运行。**
+
+> 1. `libs` 中包含使用 `tempfiles` 文件夹中的源代码生成的动态库
+> 2. `includes` 中包含 `test*.c` 需要用到的头文件
+
+### 生成动态库
+
+```bash
+# 一般生成方式
+gcc -shared a.c -o liba.so
+
+# 如果碰到 /usr/bin/ld: /tmp/ccojI2tR.o: relocation R_X86_64_PC32 against symbol `factorial' can not be used when making a shared object; recompile with -fPIC , 可以使用如下命令
+gcc -c -fPIC source_file.c -o object_file.o
+gcc -shared object_file.o -o libshared_object.so
+```
+
+> 关于 -fPIC 的问题：
+> `-fPIC` 是 GCC（GNU Compiler Collection）编译器的一个选项，用于生成位置无关代码（Position Independent Code，PIC）。
+>
+> 位置无关代码是一种机器代码，它可以在内存中的任意位置加载和执行，而不受具体加载地址的限制。这对于共享对象（动态链接库）非常重要，因为共享对象可以在内存中的不同地址加载，并被多个进程或程序共享使用。
+>
+> 使用 `-fPIC` 选项编译源代码时，编译器会生成适用于位置无关的目标文件。这些目标文件可以在后续的链接过程中用于创建共享对象。
+>
+> 通过使用 `-fPIC`，编译器会使用一些技术来生成位置无关代码，例如使用相对寻址（relative addressing）而不是绝对寻址（absolute addressing），以及使用全局偏移表（Global Offset Table，GOT）等。
+>
+> 总之，`-fPIC` 选项告诉编译器生成位置无关代码，以便在创建共享对象时能够正确地进行链接和加载，避免出现链接错误。
+
+### 编译时指定头文件可以使用
+
+```bash
+gcc testxxx.c ./libs/libxxx.so -I ./includes/ -o testxxx
+```
diff --git a/day8/homework/h1/includes/a.h b/day8/homework/h1/includes/a.h
new file mode 100644
index 0000000..b34462a
--- /dev/null
+++ b/day8/homework/h1/includes/a.h
@@ -0,0 +1,6 @@
+#ifndef __A_H__
+#define __A_H__
+
+int factorial(int); // 声明阶乘函数
+
+#endif
\ No newline at end of file
diff --git a/day8/homework/h1/includes/b.h b/day8/homework/h1/includes/b.h
new file mode 100644
index 0000000..9009917
--- /dev/null
+++ b/day8/homework/h1/includes/b.h
@@ -0,0 +1,6 @@
+#ifndef __B_H__
+#define __B_H__
+
+int *arrSort(int arrInput[], int arrlen); // 声明数组排序函数
+
+#endif
\ No newline at end of file
diff --git a/day8/homework/h1/libs/liba.so b/day8/homework/h1/libs/liba.so
new file mode 100755
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diff --git a/day8/homework/h1/tempfiles/a.c b/day8/homework/h1/tempfiles/a.c
new file mode 100644
index 0000000..1aa104c
--- /dev/null
+++ b/day8/homework/h1/tempfiles/a.c
@@ -0,0 +1,10 @@
+#include "a.h"
+#include <stdio.h>
+
+int factorial(int n)
+{
+    if (n == 0)
+        return 1;
+    else
+        return n * factorial(n - 1);
+}
\ No newline at end of file
diff --git a/day8/homework/h1/tempfiles/a.h b/day8/homework/h1/tempfiles/a.h
new file mode 100644
index 0000000..b34462a
--- /dev/null
+++ b/day8/homework/h1/tempfiles/a.h
@@ -0,0 +1,6 @@
+#ifndef __A_H__
+#define __A_H__
+
+int factorial(int); // 声明阶乘函数
+
+#endif
\ No newline at end of file
diff --git a/day8/homework/h1/tempfiles/b.c b/day8/homework/h1/tempfiles/b.c
new file mode 100644
index 0000000..ba4fe1d
--- /dev/null
+++ b/day8/homework/h1/tempfiles/b.c
@@ -0,0 +1,20 @@
+#include "b.h"
+#include <stdio.h>
+
+int *arrSort(int arrInput[], int arrlen)
+{
+    int i, j, temp;
+    for (i = 0; i < arrlen - 1; i++)
+    {
+        for (j = 0; j < arrlen - 1 - i; j++)
+        {
+            if (arrInput[j] > arrInput[j + 1])
+            {
+                temp = arrInput[j];
+                arrInput[j] = arrInput[j + 1];
+                arrInput[j + 1] = temp;
+            }
+        }
+    }
+    return arrInput;
+}
\ No newline at end of file
diff --git a/day8/homework/h1/tempfiles/b.h b/day8/homework/h1/tempfiles/b.h
new file mode 100644
index 0000000..9009917
--- /dev/null
+++ b/day8/homework/h1/tempfiles/b.h
@@ -0,0 +1,6 @@
+#ifndef __B_H__
+#define __B_H__
+
+int *arrSort(int arrInput[], int arrlen); // 声明数组排序函数
+
+#endif
\ No newline at end of file
diff --git a/day8/homework/h1/testArrSort.c b/day8/homework/h1/testArrSort.c
new file mode 100644
index 0000000..384a063
--- /dev/null
+++ b/day8/homework/h1/testArrSort.c
@@ -0,0 +1,24 @@
+#include "b.h"
+#include <stdio.h>
+
+int main()
+{
+    int N; // 定义数组长度
+    printf("Please input the length of the array: ");
+    scanf("%d", &N);
+    int arrInput[N]; // 未初始化的数组
+    printf("Please input %d numbers: ", N);
+    int i = 0;
+    while (i < N)
+    {
+        scanf("%d", &arrInput[i++]);
+    }
+
+    int *arrOutput = arrSort(arrInput, N);
+    for (int i = 0; i < N; i++)
+    {
+        printf("%d ", arrOutput[i]);
+    }
+    printf("\n");
+    return 0;
+}
\ No newline at end of file
diff --git a/day8/homework/h1/testFactorial.c b/day8/homework/h1/testFactorial.c
new file mode 100644
index 0000000..d39cf5e
--- /dev/null
+++ b/day8/homework/h1/testFactorial.c
@@ -0,0 +1,11 @@
+#include "./includes/a.h"
+#include <stdio.h>
+
+int main()
+{
+    int n;
+    printf("Please input a number: ");
+    scanf("%d", &n);
+    printf("%d! = %d\n", n, factorial(n));
+    return 0;
+}
\ No newline at end of file