From d2fe45558921dde8bde0e3adb016f5ad08f58414 Mon Sep 17 00:00:00 2001
From: flykhan <liubo666666@outlook.com>
Date: Sat, 22 Jul 2023 10:36:56 +0800
Subject: [PATCH] =?UTF-8?q?day=2011=20homework=20=E9=83=A8=E5=88=86?=
 =?UTF-8?q?=E5=86=85=E5=AE=B9?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 day11/homework/h4.c | 55 ++++++++++++++++++++++++++++++++
 day11/homework/h8.c | 78 +++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 133 insertions(+)
 create mode 100644 day11/homework/h4.c
 create mode 100644 day11/homework/h8.c

diff --git a/day11/homework/h4.c b/day11/homework/h4.c
new file mode 100644
index 0000000..615ff8a
--- /dev/null
+++ b/day11/homework/h4.c
@@ -0,0 +1,55 @@
+// 编写一个程序，要求用户输入一串字符，然后动态创建一个字符数组，并将用户输入的字符存储到数组中。然后，使用realloc函数将数组的大小扩展为原来的两倍，并继续接受用户输入的字符，直到用户输入字符为换行符（ '\n'）。最后，打印数组中存储的所有字符。
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+char *
+str_cpy(char *dest, const char *src)
+{
+    int cnt;
+    while (src[cnt++])
+        ;
+
+    char *res = (char *)malloc(cnt * sizeof(char *));
+    if (NULL == res)
+    {
+        perror("malloc");
+        exit(0);
+    }
+
+    for (int i = 0; i < cnt; i++)
+        res[i] = src[i];
+
+    return res;
+}
+
+int main()
+{
+    char s1[100]; // 相当于 char *s1 = (char *)malloc(100 * sizeof(char *));
+    printf("请输入一个字符串: ");
+    // scanf("%s", s1);
+    fgets(s1, sizeof(s1), stdin); // scanf() 不能接收换行，故改用 fgets()
+    char *s2 = str_cpy(s2, s1);
+
+    int tmp_size = strlen(s2);
+
+    // 扩展数组大小
+    s2 = (char *)realloc(s2, 2 * tmp_size);
+    if (NULL == s2)
+    {
+        perror("realloc");
+        exit(0);
+    }
+    printf("请继续输入字符, 输入换行符结束输入\n");
+    char *ch;
+    s2[tmp_size - 1] = ' ';
+    while ((ch = getchar()) != '\n')
+    {
+        s2[tmp_size++] = ch;
+    }
+
+    printf("结果为: %s\n", s2);
+    free(s2);
+
+    return 0;
+}
\ No newline at end of file
diff --git a/day11/homework/h8.c b/day11/homework/h8.c
new file mode 100644
index 0000000..297fa70
--- /dev/null
+++ b/day11/homework/h8.c
@@ -0,0 +1,78 @@
+// 设计函数 char (*tok(char *s, const char *delim))[100] ，实现s按给定的分隔符分隔出所有的内容，并返回分隔之后的二维数组指针。
+// 示例：
+//     char s[] = "Hello,World,How,Are,You";
+//     const char delim[] = ",";
+//     char(*tokens)[100] = tok(s, delim);
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+char (*tok(char *s, const char *delim))[100]
+{
+    // 计算分隔符的长度
+    size_t delim_len = strlen(delim);
+
+    // 计算字符串中分隔符的个数
+    int count = 1;
+    char *p = s;
+    while (*p != '\0')
+    {
+        if (strncmp(p, delim, delim_len) == 0)
+        {
+            count++;
+            p += delim_len; // 跳过分隔符
+        }
+        else
+        {
+            p++;
+        }
+    }
+
+    // 分配存储结果的二维数组
+    char(*tokens)[100] = malloc(count * sizeof(*tokens));
+
+    // 分隔字符串
+    int i = 0;
+    p = s;
+    char *token_start = p;
+    while (*p != '\0')
+    {
+        if (strncmp(p, delim, delim_len) == 0)
+        {
+            strncpy(tokens[i], token_start, p - token_start);
+            tokens[i][p - token_start] = '\0';
+            i++;
+            p += delim_len; // 跳过分隔符
+            token_start = p;
+        }
+        else
+        {
+            p++;
+        }
+    }
+
+    // 处理最后一个分隔符后的部分
+    strncpy(tokens[i], token_start, p - token_start);
+    tokens[i][p - token_start] = '\0';
+
+    return tokens;
+}
+
+int main()
+{
+    char s[] = "Hello,World,How,Are,You";
+    const char delim[] = ",";
+    char(*tokens)[100] = tok(s, delim);
+
+    // 打印分隔后的结果
+    for (int i = 0; tokens[i][0] != '\0'; i++)
+    {
+        printf("%s\n", tokens[i]);
+    }
+
+    // 释放内存
+    free(tokens);
+
+    return 0;
+}
\ No newline at end of file