diff --git a/test/d1.c b/test/d1.c
new file mode 100644
index 0000000..3977e13
--- /dev/null
+++ b/test/d1.c
@@ -0,0 +1,25 @@
+#include <stdio.h>
+
+// 这种方式只能交换指针指向的值，不能交换指针本身，而且无法改变实参的值
+void swap(int *piA, int *piB)
+{
+    printf("first iA-p: %p, iB-p: %p\n iA: %d,iB: %d\n", piA, piB, *piA, *piB);
+
+    int *piC;
+    piC = piA;
+    piA = piB;
+    piB = piC;
+    printf("after iA-p: %p, iB-p: %p\n iA: %d,iB: %d\n", piA, piB, *piA, *piB);
+}
+
+int main()
+{
+    int iA = 100, iB = 200;
+    printf("main first iA-p: %p, iB-p: %p\n iA: %d,iB: %d\n", &iA, &iB, iA, iB);
+
+    int *piA = &iA, *piB = &iB;
+    swap(piA, piB);
+    printf("main after iA-p: %p, iB-p: %p\n iA: %d,iB: %d\n", &iA, &iB, iA, iB);
+
+    return 0;
+}
\ No newline at end of file
diff --git a/test/d2.c b/test/d2.c
new file mode 100644
index 0000000..966e270
--- /dev/null
+++ b/test/d2.c
@@ -0,0 +1,25 @@
+#include <stdio.h>
+
+// 会交换实参的值
+void swap(int *piA, int *piB)
+{
+    // printf("first iA-p: %p, iB-p: %p\n iA: %d,iB: %d\n", piA, piB, *piA, *piB);
+
+    int piC;
+    piC = *piA;
+    *piA = *piB;
+    *piB = piC;
+    // printf("after iA-p: %p, iB-p: %p\n iA: %d,iB: %d\n", piA, piB, *piA, *piB);
+}
+
+int main()
+{
+    int iA = 100, iB = 200;
+    printf("first iA-p: %p, iB-p: %p\n iA: %d,iB: %d\n", &iA, &iB, iA, iB);
+
+    int *piA = &iA, *piB = &iB;
+    swap(piA, piB);
+    printf("after iA-p: %p, iB-p: %p\n iA: %d,iB: %d\n", &iA, &iB, iA, iB);
+
+    return 0;
+}
\ No newline at end of file
diff --git a/test/t1_11.c b/test/t1_11.c
new file mode 100644
index 0000000..48bdda6
--- /dev/null
+++ b/test/t1_11.c
@@ -0,0 +1,13 @@
+#include <stdio.h>
+
+#define ADD(x, y) (x + y)   /*加*/
+#define SUB(x, y) (x) - (y) /*减*/
+#define MUL(x, y) (x * y)   /*乘*/
+
+int main()
+{
+    unsigned int uiA;
+    uiA = MUL(ADD(9, 2), SUB(6, 3)); // ((9+2)*(6)-(3)) = 63
+    printf("uiA = %d\n", uiA);
+    return 0;
+}
\ No newline at end of file
diff --git a/test/t1_4.c b/test/t1_4.c
new file mode 100644
index 0000000..d06a21d
--- /dev/null
+++ b/test/t1_4.c
@@ -0,0 +1,15 @@
+#include <stdio.h>
+int main()
+{
+    int i;
+    int sum = 1;
+    for (i = 1; i <= 10; i++)
+    {
+        sum += i; // 加完之后才判断是否为5，因此sum会加上5
+        if (i == 5)
+            continue;
+        // printf("i = %d, sum=%d\n", i, sum);
+    }
+    printf("sum=%d\n", sum);
+    return 0;
+}
\ No newline at end of file
diff --git a/test/t2_1_4.c b/test/t2_1_4.c
new file mode 100644
index 0000000..623d508
--- /dev/null
+++ b/test/t2_1_4.c
@@ -0,0 +1,18 @@
+#include <stdio.h>
+
+int main()
+{
+    unsigned int uiCount = 0;
+    for (; uiCount <= 10; uiCount++)
+    {
+        printf("uiCount=%u\n", uiCount);
+
+        if (uiCount == 5)
+        {
+            break;
+        }
+        // printf("uiCount=%u\n", uiCount);
+    }
+    // printf("uiCount=%u\n", uiCount);
+    return 0;
+}
\ No newline at end of file
diff --git a/test/t3_3.c b/test/t3_3.c
new file mode 100644
index 0000000..75c6532
--- /dev/null
+++ b/test/t3_3.c
@@ -0,0 +1,17 @@
+void func(char aver[100])
+{
+    char str[] = "hello world";
+    char *p = str;
+    char n = 10;
+    void *p1 = malloc(100);
+    printf("size1=[%d]\n", sizeof(str));
+    printf("size2=[%d]\n", sizeof(p));
+    printf("size3=[%d]\n", sizeof(n));
+    printf("size4=[%d]\n", sizeof(aver));
+    printf("size5=[%d]\n", sizeof(p1));
+}
+int main()
+{
+    char str[100];
+    func(str);
+}
\ No newline at end of file