diff --git a/src/main1.c b/src/main1.c
new file mode 100644
index 0000000..13d4f35
--- /dev/null
+++ b/src/main1.c
@@ -0,0 +1,64 @@
+#include <stdio.h>
+#include <dirent.h>  // read dir
+#include <regex.h>  // regular expression
+#include <string.h>
+
+/*
+ * 结构体dirent的属性d_name里存储了app的名字
+ * 由于c语言没有字符串数组，而且不知道师兄想怎么处理app名，所以我直接存储的数组元素类型是dirent*
+ * 通过app_list[index]->d_name就可以获取文件名
+ */
+
+int main() {
+    // variable declaration for reading directory
+    DIR* dir = NULL;
+    int app_max = 50;  // c doesn't have dynamic array like "std::vector" in c++, so I set a large size for array
+    int app_index = 0;
+    struct dirent* read_result;
+    struct dirent* app_list[app_max];
+    const char* app_path = "/home/wwd/CLionProjects/AndroidTest/data/data";  // test, should be /data/data in android
+
+    // variable declaration for regular expression
+    regex_t reg;
+    int err_code;
+    int compression_flags = REG_EXTENDED | REG_ICASE;
+    char err_buff[256];
+    char* reg_str = "com.android.*";
+
+    // set regular expression and handle error
+    if ((err_code = regcomp(&reg, reg_str, compression_flags)) != 0){
+        printf("set regular expression failed:\n");
+        regerror(err_code, &reg, err_buff, sizeof(err_buff));
+        fprintf(stderr, "%s\n", err_buff);
+        return -1;
+    }
+
+    // read dir
+    if ((dir = opendir(app_path)) == NULL){
+        printf("open dir failed\n");
+        return -1;
+    }
+
+    // get result using loop
+    while ((read_result = readdir(dir)) != NULL){
+        // filter, ignore current dir + parent dir + com.android.* app
+        if (strcmp(read_result->d_name, ".") == 0
+        || strcmp(read_result->d_name, "..") == 0
+        || (err_code = regexec(&reg, read_result->d_name, 0, NULL, 0)) == 0)
+            continue;
+        // d_type = 4 means it's a directory
+        if (read_result->d_type == 4){
+            app_list[app_index] = read_result;
+            app_index++;
+        }
+    }
+
+    // print apps' names
+    printf("we have %d apps\n", app_index);
+    for (int i = 0; i < app_index; i++){
+        printf("app %d : %s\n", i, app_list[i]->d_name);
+    }
+
+    regfree(&reg);
+    return 0;
+}