diff --git a/day10/homework/h11.c b/day10/homework/h11.c
new file mode 100644
index 0000000..4bc2552
--- /dev/null
+++ b/day10/homework/h11.c
@@ -0,0 +1,18 @@
+#include <stdio.h>
+
+void fun(char *c, int d)
+{
+    printf("%d\n", *c); // 97
+    c = c + 1;
+    printf("%d\n", *c); // 65
+    d = d + 1;
+    printf("fun ---> %c, %c\n", *c, d);
+}
+
+int main()
+{
+    char a = 'A', b = 'a';
+    fun(&b, a);
+    printf("main --> %c, %c\n", a, b);
+    return 0;
+}
\ No newline at end of file
diff --git a/day10/homework/h11_2.c b/day10/homework/h11_2.c
new file mode 100644
index 0000000..c5bdd06
--- /dev/null
+++ b/day10/homework/h11_2.c
@@ -0,0 +1,16 @@
+#include <stdio.h>
+
+void fun(char *c, int *d)
+{
+    *c = *c + 1;
+    *d = *d + 1;
+    printf("fun ---> %c, %c\n", *c, *d);
+}
+
+int main()
+{
+    char a = 'A', b = 'a';
+    fun(&b, &a);
+    printf("main --> %c, %c\n", a, b);
+    return 0;
+}
diff --git a/day10/homework/h12.c b/day10/homework/h12.c
new file mode 100644
index 0000000..5efe13e
--- /dev/null
+++ b/day10/homework/h12.c
@@ -0,0 +1,26 @@
+// 设计函数int toInt(char *str), 实现将字符串转成数值的功能。 【提示】如 toInt("123") 返回 123
+#include <stdio.h>
+
+int toInt(char *str)
+{
+    int n = 0;
+    while (*str)
+    {
+        if (*str < '0' || *str > '9') // 先判断是否是数字
+        {
+            return -1;
+        }
+        n = n * 10 + *str - '0'; // 将字符转换为数字
+        str++;
+    }
+    return n;
+}
+
+int main()
+{
+    char *s = "123";
+    int n = toInt(s);
+    printf("%d\n", n);
+
+    return 0;
+}
\ No newline at end of file
diff --git a/day10/homework/h14.c b/day10/homework/h14.c
new file mode 100644
index 0000000..16cc852
--- /dev/null
+++ b/day10/homework/h14.c
@@ -0,0 +1,28 @@
+// 设计函数，给定两个字符串指针，实现将第二字符串的内容拼接到第一个字符串中，并返回第一个字符串指针。
+#include <stdio.h>
+
+char *concat(char *dest, char *src)
+{
+    while (*dest) // 找到 dest 的末尾
+    {
+        dest++;
+    }
+    while (*src) // 将 src 的内容复制到 dest 的末尾
+    {
+        *dest = *src;
+        dest++;
+        src++;
+    }
+    *dest = '\0'; // 最后补上字符串结束符
+    return dest;  // 返回 dest 的首地址
+}
+
+int main()
+{
+    char m[128] = "";
+    concat(m, "disen");
+    concat(m, ", 666");
+    printf("%s\n", m); // 输出结果：disen, 666
+
+    return 0;
+}
\ No newline at end of file
diff --git a/day10/homework/h15.c b/day10/homework/h15.c
new file mode 100644
index 0000000..5cc9605
--- /dev/null
+++ b/day10/homework/h15.c
@@ -0,0 +1,37 @@
+// 设计函数，接收一个数值类型的5行3列的二维数组和查找的数值，返回数值在二维数组的序号。
+// 【提示】第一个元素的序号为0， 第二行第一个元素的序号为3
+#include <stdio.h>
+
+int find(int (*arr)[3], int num)
+{
+    int *p = arr[0]; // arr[0] == &arr[0][0]
+    // int *p = &arr[0][0]; // arr[0] == &arr[0][0]
+    int n = 0;
+    for (int i = 0; i < 5; i++)
+    {
+        for (int j = 0; j < 3; j++)
+        {
+            // if (arr[i][j] == num)
+            if (*(p + i * 3 + j) == num) // arr[i][j] == *(p+i*3+j)
+            {
+                return n;
+            }
+            n++; // 序号加1
+        }
+    }
+    return -1; // 没找到
+}
+
+int main()
+{
+    int a[5][3] = {
+        {1, 2, 3},
+        {4, 5, 6},
+        {7, 9, 9},
+        {10, 11, 12},
+        {13, 14, 15}};
+
+    printf("%d\n", find(a, 9)); // 输出结果：7
+
+    return 0;
+}
\ No newline at end of file
diff --git a/day10/homework/h4.c b/day10/homework/h4.c
new file mode 100644
index 0000000..824f1d3
--- /dev/null
+++ b/day10/homework/h4.c
@@ -0,0 +1,25 @@
+// 以下程序的输出结果是哪一项 ? ()
+// #include <stdio.h>
+//                                  main()
+// {
+//     int a[12] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12}, \* p[4] = {NULL}, i = 0;
+//     for (i = 0; i < 4; i++)
+//         p[i] = &a[i\* 3];
+//     printf("%d\n", *p[3]);
+// }
+// A.输出项不合法 B.4 C.7 D.10
+#include <stdio.h>
+
+int main()
+{
+    int a[12] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12},
+        *p[4] = {NULL},
+        i = 0;
+
+    for (i = 0; i < 4; i++)
+        p[i] = &a[i * 3];
+
+    printf("%d\n", *p[3]); // 10
+
+    return 0;
+}
\ No newline at end of file
diff --git a/day10/homework/h5.c b/day10/homework/h5.c
new file mode 100644
index 0000000..67582ec
--- /dev/null
+++ b/day10/homework/h5.c
@@ -0,0 +1,19 @@
+// 有以下说明和语句, 则p2 - p1的值为多少 ? int a[10] = {0}, *p1 = NULL, *p2 = NULL;
+// p1 = a;
+// p2 = &a[5];
+// A.5 B.6 C.10 D.没有指针与指针的减法
+#include <stdio.h>
+#include <stdint.h>
+
+int main()
+{
+    int a[10] = {0},
+        *p1 = NULL,
+        *p2 = NULL;
+    p1 = a;
+
+    p2 = &a[5];               // p2 指向 a[5] 的地址
+    printf("%ld\n", p2 - p1); // 同一个数组的指针相减，得到的是两个指针之间的元素个数
+
+    return 0;
+}
\ No newline at end of file
diff --git a/day10/homework/h8.c b/day10/homework/h8.c
new file mode 100644
index 0000000..ecef9cf
--- /dev/null
+++ b/day10/homework/h8.c
@@ -0,0 +1,28 @@
+// 以下程序的输出结果是（ ）
+//     ​ A）17 B）18 C）19 D）20
+//     main()
+// {
+//     int a[] = {2, 4, 6, 8, 10}, y = 1, x = 0, *p = NULL;
+//     p = &a[1];
+//     for (; x < 3; x++)
+//         y += *(p + x);
+//     printf(“% d\n”, y);
+// }
+
+#include <stdio.h>
+
+int main()
+{
+    int a[] = {2, 4, 6, 8, 10},
+        y = 1,
+        x = 0,
+        *p = NULL;
+
+    p = &a[1];
+    for (; x < 3; x++)
+        y += *(p + x);
+
+    printf("%d\n", y);
+
+    return 0;
+}
\ No newline at end of file
diff --git a/day10/homework/h9.c b/day10/homework/h9.c
new file mode 100644
index 0000000..8fdffd3
--- /dev/null
+++ b/day10/homework/h9.c
@@ -0,0 +1,14 @@
+// 下面程序段的运行结果是_________.char *s = "abcde";
+// s += 2;
+// printf("%d", s);
+// a) cde     b)字符'c'     c)字符'c'的地址     d)无确定的输出结果
+#include <stdio.h>
+
+int main()
+{
+    char *s = "abcde";
+    s += 2;
+    printf("%d\n", s); // %d 会将 s 当作 int 输出，但是 s 是 char * 类型，所以会出现不确定的输出结果
+
+    return 0;
+}
\ No newline at end of file