diff --git a/02/backend/main.c b/02/backend/main.c
new file mode 100644
index 0000000..f37010f
--- /dev/null
+++ b/02/backend/main.c
@@ -0,0 +1,168 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#include <string.h>
+#include <conio.h>
+
+#define MAX_NAME_LEN 100
+#define SETTING_PATH "setting.txt"
+#define RECORD_PATH "record.txt"
+
+struct RECORD
+{
+	int nRand;
+	int nGuess;
+	int nCount;
+	time_t tBeginTime;
+	int nCost;
+	char szName[MAX_NAME_LEN];
+};
+
+
+int loadNickname(const char* szPath, char* szNickname, int nSize) 
+{
+	FILE *fp = 0;
+	if (!(fp = fopen(szPath, "rb")))
+		return 1;
+	memset(szNickname, 0, nSize);
+	fread(szNickname, nSize, 1, fp);
+	szNickname[nSize - 1] = 0;
+	fclose(fp);
+	return 0;
+}
+
+int setNickname(const char* szPath) 
+{
+	FILE *fp = 0;
+	char szNickname[MAX_NAME_LEN] = "";
+	if (!(fp = fopen(szPath, "wb")))
+		return 1;
+	printf("Please input your Name:");
+	scanf("%s", szNickname);
+	szNickname[MAX_NAME_LEN - 1] = 0;
+	fwrite(szNickname, sizeof(szNickname), 1, fp);
+	fclose(fp);
+	return 0;
+}
+
+struct RECORD guess(char* szNickName)
+{
+	struct RECORD stRecord = {0, 0, 0, 0, 0};
+	stRecord.tBeginTime = time(NULL);
+	stRecord.nRand = rand() % 1000 + 1;
+	printf("请输入1~1000的数字：");
+	while (stRecord.nGuess != stRecord.nRand)
+	{
+		while (!scanf("%d", &stRecord.nGuess))
+			getchar(); // 防止用户输入非数字导致的死循环
+		if (stRecord.nGuess > stRecord.nRand)
+		{
+			printf("大了！\n");
+		}
+		else if (stRecord.nGuess < stRecord.nRand)
+		{
+			printf("小了！\n");
+		}
+		stRecord.nCount++;
+	}
+	stRecord.nCost = time(NULL) - stRecord.tBeginTime;
+	strcpy(stRecord.szName, szNickName);
+	printf("你猜中了！你猜了%d次！\n", stRecord.nCount);
+	if (0 == szNickName || 0 == strlen(szNickName)) 
+	{
+		printf("This is your first play.");
+		setNickname(SETTING_PATH);
+	}
+	return stRecord;
+}
+
+int save(struct RECORD stRecord)
+{
+	FILE * fp = NULL;
+	if(!(fp = fopen(RECORD_PATH, "ab")))
+	{
+		printf("Save Record Failed.. \n");
+		return 1;
+	}   
+	fseek(fp, SEEK_END, 0); 
+
+	fprintf(fp, "%d,%d,%d,%ld,%d,%s\r\n", 
+		stRecord.nRand, 
+		stRecord.nGuess, 
+		stRecord.nCount, 
+		(long)stRecord.tBeginTime, 
+		stRecord.nCost, 
+		stRecord.szName);
+	fclose(fp);
+	return 0;
+}
+
+int view()
+{
+	FILE * fp = NULL;
+	struct RECORD stRecord;
+	if (!(fp = fopen(RECORD_PATH, "rb")))
+	{
+		printf("You must be play first. \n");
+		return 1;
+	}   
+
+	printf("Name\tGuess\tCount\tCost\tBegin\n");
+
+	while(!feof(fp)) 
+	{
+		long ltime = 0;
+		fscanf(fp, "%d,%d,%d,%ld,%d,%s\r\n",
+			&stRecord.nRand,
+			&stRecord.nGuess,
+			&stRecord.nCount,
+			&ltime,
+			&stRecord.nCost, 
+			stRecord.szName);
+		stRecord.tBeginTime = (time_t)ltime;
+		printf("%s\t%d\t%d\t%d\t%s",
+			stRecord.szName,
+			stRecord.nGuess,
+			stRecord.nCount,
+			stRecord.nCost,
+			asctime(gmtime(&stRecord.tBeginTime)));
+	}
+	printf("\n\n");
+	fclose(fp);
+	return 0;
+}
+
+
+int menu(char* szNickname) {
+	if (szNickname && strlen(szNickname) > 0)
+		printf("Hi! %s! ", szNickname);
+	printf("Welcome to play 'Guess Number'!\n");
+	printf("\n");
+	printf("1. Begin to Play!\n");
+	printf("2. View the Record!\n");
+	printf("3. Change Nickname!\n");
+	printf("4. Quit the Game!\n");
+	printf("\n");
+
+	return getch();
+}
+
+int main()
+{
+	char szNickname[MAX_NAME_LEN] = "";
+	srand((unsigned)time(NULL));
+	while(1)
+	{
+		loadNickname(SETTING_PATH, szNickname, MAX_NAME_LEN);
+		switch (menu(szNickname))
+		{
+		case '1': save(guess(szNickname)); break;
+		case '2': view(); break;
+		case '3': setNickname(SETTING_PATH); break;
+		case '4': return 0;
+		default : continue;		
+		}
+	}
+	return 0;
+}
+
diff --git a/02/readme.md b/02/readme.md
index dfd9934..587b5d0 100644
--- a/02/readme.md
+++ b/02/readme.md
@@ -1,6 +1,6 @@
 # 第二期项目
 
-## [后端] 4/11 保存猜数字成绩
+## [[后端] 4/11 保存猜数字成绩](./backend)
 
 修改上一个程序，添加如下功能：  
 1. 当用户猜到数字之后，提示其输入一个昵称作为游戏名称，然后保存成绩，包含昵称，开始时间，耗时，所猜数字，猜测次数；