diff --git a/level1/p01_runningLetter/runningLatter.cpp b/level1/p01_runningLetter/runningLatter.cpp
new file mode 100644
index 00000000..6ef1bd3d
--- /dev/null
+++ b/level1/p01_runningLetter/runningLatter.cpp
@@ -0,0 +1,32 @@
+#include<cstdio>
+#include<cstdlib>
+/*
+   By HuangChongYi 2018081306006
+*/
+const int _Maxlength=80
+const int time=5000000
+
+using namespace std;
+void sleep(){
+	for (int i=1;i<=time;i++){
+	}
+	return;
+}
+int abs(int x){
+	return x>0 ? x : -x;
+}
+int main(){
+	int blank;
+	for(int i=0;i<2*_Maxlength;i++){
+			sleep();
+			blank=_Maxlength-abs(_Maxlength-i);
+			for(int j=0;j<blank;j++) 
+      		printf(" ");
+			printf("8\n");
+			sleep();
+			system("cls");
+	}
+	return 0;
+}
+
+
diff --git a/level1/p02_isPrime/Is_prime.cpp b/level1/p02_isPrime/Is_prime.cpp
new file mode 100644
index 00000000..206dc38b
--- /dev/null
+++ b/level1/p02_isPrime/Is_prime.cpp
@@ -0,0 +1,18 @@
+#include<cstdio>
+
+using namespace std;
+
+// by huang chong yi   2018081306006
+bool Is_prime(int x){
+	for(int i=2;i*i<=x;i++)
+		if(x%i==0) return false;
+	return true;
+}
+
+int main(){
+	int n;
+	scanf("%d",&n);
+	if ( Is_prime(n) ) printf("%d is a prime !\n",n);
+	else printf("%d is not a prime !\n",n);
+	return 0;
+} 
diff --git a/level1/p03_Diophantus/diophantus.cpp b/level1/p03_Diophantus/diophantus.cpp
new file mode 100644
index 00000000..a1a2c556
--- /dev/null
+++ b/level1/p03_Diophantus/diophantus.cpp
@@ -0,0 +1,16 @@
+#include<cstdio>
+#include<cstring>
+
+using namespace std;
+
+// x=1/6 x +1/12 x +1/7 x + 5 + 1/2x + 4 
+
+int main(){
+	double chushu=1.0/6.0 + 1.0/12.0+ 1.0/7.0 + 1.0/ 2.0 ;
+	double beichushu=5.0+4.0 ;
+	double x=beichushu / (1.0-chushu);
+	int intx = int (x+0.5);
+	int ans = intx-4;
+	printf("%d\n",ans);
+	return 0;
+}
diff --git a/level1/p04_ narcissus/narcissus b/level1/p04_ narcissus/narcissus
new file mode 100644
index 00000000..9c3076af
--- /dev/null
+++ b/level1/p04_ narcissus/narcissus	
@@ -0,0 +1,19 @@
+#include<cstdio>
+#include<cstring>
+#define FOR(i,a,b) for(int i=a;i<=b;i++)
+//by HuangChongYi 2018081306006
+using namespace std;
+int answer[999];
+int answer_count;
+int main(){
+	answer_count=0;
+	FOR(i,1,9)
+		FOR(j,0,9)
+			FOR(k,0,9)
+				if (i*100+j*10+k==i*i*i+j*j*j+k*k*k) 
+					answer[++answer_count]=i*100+j*10+k;
+	FOR(i,1,answer_count){
+		printf("%d\t",answer[i]);
+	}
+	return 0;
+} 
diff --git a/level1/p05_allPrimes/AllPrimes b/level1/p05_allPrimes/AllPrimes
new file mode 100644
index 00000000..c8dee783
--- /dev/null
+++ b/level1/p05_allPrimes/AllPrimes
@@ -0,0 +1,31 @@
+#include<cstdio>
+#include<cstring>
+
+using namespace std;
+
+#define maxn 1000+10
+
+bool Is_not_prime[maxn]; 
+int prime[maxn];
+
+//  the time efficiency is  O (n log log n ) in theory
+//  by huang chong yi   2018081306006
+int min(int a,int b){
+	return a < b ? a : b;    
+}
+int main(){
+	memset(Is_not_prime,0,sizeof(Is_not_prime));  // 0 means prime and 1 means not a prime;
+	memset(prime,0,sizeof(prime));
+	int cnt=0;                      // count the prime;
+	for (int i=2;i<=1000;i++)
+		if (! Is_not_prime[i]){ //  is a prime
+			for(int j=i*2;j<=1000;j+=i)
+				Is_not_prime[j]=true;
+			prime[++cnt]=i;
+		}
+	for(int i=1;i<=cnt;i++){
+		printf("\t%d ",prime[i]);
+		if (i%10==0) printf("\n");     // print with every 10 primes in a line ;
+	} 
+	return 0;
+}
diff --git a/level1/p06_Goldbach/Goldbach.cpp b/level1/p06_Goldbach/Goldbach.cpp
new file mode 100644
index 00000000..d15332c3
--- /dev/null
+++ b/level1/p06_Goldbach/Goldbach.cpp
@@ -0,0 +1,26 @@
+#include<cstdio>
+#include<cstring>
+
+using namespace std;
+#define FOR(i,a,b) for(int i=a;i<=b;i++)
+bool is_prime(int x){
+	for(int i=2;i*i<=x;i++){
+		if (x%i==0) return false;
+	}
+	return true;
+}
+int main(){
+	int flag;
+	FOR(i,4,100)
+		if (!(i&1)){    // i%2==0 
+			flag=1;
+			FOR(j,i>>1,i)
+				if(flag)
+				if(is_prime(j)&&is_prime(i-j)){
+					printf("%d=%d+%d\n",i,i-j,j);
+					flag=0;
+				}
+			if (flag) printf("Congratulation! You have proved goldbach is wrong !!!!!\n");
+		}
+	return 0;
+}
diff --git a/level1/p07_encrypt_decrypt/encrypt_decrypt.cpp b/level1/p07_encrypt_decrypt/encrypt_decrypt.cpp
new file mode 100644
index 00000000..d921c583
--- /dev/null
+++ b/level1/p07_encrypt_decrypt/encrypt_decrypt.cpp
@@ -0,0 +1,25 @@
+//encrypt_decrypt  : only can transform A~Z (65-90)and a~z (97-122)
+//by huangchongyi 2018081306006
+#include<cstdio>
+#include<cstring>
+using namespace std;
+char key[11]="I HATE YOU";    //the key to encrypt or decrypt
+void encrypt_or_decrypt(char *a,int sigma){    //sigma is to show to encrypt or decrypt
+	for(int i=0;a[i]!='\0';i++){
+		if (a[i]>='a'&&a[i]<='z') a[i]=(26+a[i]-'a'+sigma*((key[i%10]-'a')%26))%26 +'a';
+		if (a[i]>='A'&&a[i]<='Z') a[i]=(26+a[i]-'A'+sigma*((key[i%10]-'A')%26))%26 +'A';
+	}
+	return;
+}
+int main(){
+	char passage[100]="I LOVE you i love YOU I LOVE you i love YOU I LOVE you i love YOU I LOVE you i love YOU ";
+	printf("the origin  ：%s\n",passage);
+	
+	encrypt_or_decrypt(passage,1);
+	printf("the encrypt : %s\n",passage);
+	
+	encrypt_or_decrypt(passage,-1);
+	printf("the decrypt : %s\n",passage); 
+	
+	return 0;
+}
diff --git a/level1/p08_hanoi/hanoi.cpp b/level1/p08_hanoi/hanoi.cpp
new file mode 100644
index 00000000..fb5f97cc
--- /dev/null
+++ b/level1/p08_hanoi/hanoi.cpp
@@ -0,0 +1,18 @@
+#include<cstdio>
+
+using namespace std;
+
+//  by huang chong yi   2018081306006
+void move(int brick,char place_a,char place_b){
+	if(brick==0) return ;
+	move(brick-1,place_a,294-place_a-place_b);                    //  294 is the sum of 'a' , 'b' and 'c' ;
+	printf("move the %dth from %c to %c\n",brick,place_a,place_b);
+	move(brick-1,294-place_a-place_b,place_b);
+}
+
+int main(){
+	int n;
+	scanf("%d",&n);
+	move(n,'a','c');  //the total move is 2^n -1 ; 
+	return 0;
+}
diff --git a/level1/p09_maze/maze.cpp b/level1/p09_maze/maze.cpp
new file mode 100644
index 00000000..f5411e6d
--- /dev/null
+++ b/level1/p09_maze/maze.cpp
@@ -0,0 +1,122 @@
+// I don't know if I set the target in my own account successfully
+
+#include<cstdio>
+#include<cstring>
+#include<cstdlib>
+#include<time.h> 
+#include<conio.h>
+int map[100][100];  // 0 is road ,1 is block, 3 is person, 2 is terminal 
+int n=11,m=20;
+#define alpha (1)
+#define beta 60
+#define sleep_time 5000
+void sleep(){
+	for(int i=1;i<sleep_time;i++);
+	return ;
+}
+int random(int l,int r){
+	return rand()%(r-l+1) +l; 
+}
+void print(){
+	printf("Please use UP, DWON, LEFT and RIGHT to go out of the maze\nYou are in ● and the exit is □\n\n");
+	for(int i=0;i<=n*2;i++){
+		for(int j=0;j<=m*2;j++)
+			if (map[i][j]==1) printf("█");   //because space should be a two-char ,so it can't be put in a map of char;
+			else if (map[i][j]==0) printf("  ");       // so I can only use if and else
+			else if (map[i][j]==2) printf("□");       // exit 
+			else if (map[i][j]==3) printf("●");       // player
+		printf("\n");
+	}
+}
+
+void build(int up,int dn,int lt,int rt){   // build the maze by divide it into two part and connet these two part
+	if(up==dn&&lt==rt) return;             // and then build that two part in the same way 
+	int d=random(0,1);
+	if ( (dn-up)>=(rt-lt)*alpha ) d=1;
+	if ( (rt-lt)>=(dn-up)*alpha ) d=0;
+	if (up==dn) d=0;
+	if (lt==rt) d=1;
+	if ( d  ){
+		int d1=random(up,dn-1);
+		int d2=random(lt,rt);
+		map[d1*2][d2*2-1]=0;
+		build(up,d1,lt,rt);
+		build(d1+1,dn,lt,rt);		
+	}
+	if ( !d ){
+		int d1=random(lt,rt-1);
+		int d2=random(up,dn);
+		map[d2*2-1][d1*2]=0;
+		build(up,dn,lt,d1);
+		build(up,dn,d1+1,rt); 
+	}
+//	if (dn-up>=2&&rt!=m&&rt-lt>=2&&dn!=n)    // make the map be a forest but not a single tree , and the bigger beta is ,the more trees is would be
+//		if (random(1,100)<beta) 
+//			map[(dn+up)/2*2-1][(rt+lt)/2*2]=0;
+	return ;
+}
+
+int player_x,player_y,exit_x,exit_y;
+
+void init_maze(){
+	srand( (unsigned)time( NULL ) ); 
+	for(int i=0;i<=n*2;i++)  //the cell is in (i*2-1,j*2-1)
+		for(int j=0;j<=m*2;j++){
+			if(i%2+j%2==2) map[i][j]=0;
+			else map[i][j]=1;	
+		}
+	build(1,n,1,m);
+//	build(1,n,1,m);    if I use the funtion twice , the maze will be easier to solve and the map won't look like a " tree "
+	player_x=random(1,n/2-1)*2-1;
+	player_y=random(1,m/2-1)*2-1;
+	exit_x=random(n/2,n)*2-1;
+	exit_y=random(m/2,m)*2-1;
+	map[player_x][player_y]=3;
+	map[exit_x][exit_y]=2;
+	return ;	
+}
+int mov[5][2]={{0,0},{1,0},{-1,0},{0,-1},{0,1}};
+int get_d(){
+	char ch=getch();
+	if (ch==-32){
+		ch=getch();
+		if (ch==72) return 2;
+		if (ch==80) return 1;
+		if (ch==75) return 3;
+		if (ch==77) return 4;
+		return 0;
+	}
+	return 0;	
+}
+int move(int d){ // d is short for direction
+	int nx=player_x+mov[d][0];
+	int ny=player_y+mov[d][1];
+	if (nx>=0&&nx<=2*n)
+	if (ny>=0&&ny<=2*m)
+		if (map[nx][ny]!=1){
+			if (map[nx][ny]==2) return 1;  // success
+			map[player_x][player_y]=0;
+			player_x=nx; player_y=ny; 
+			map[player_x][player_y]=3;
+		}
+	return 0;
+}
+void game_start(){
+	init_maze();
+	print();
+	int success=0;
+	while(!success){
+		success=move( get_d() );
+		system("cls");
+		print();
+		sleep();
+	}
+	sleep();sleep();sleep();
+	system("cls");
+	printf("YOU WIN !!!");
+	return;
+}
+int main(){
+	game_start();
+	return 0;
+} 
diff --git a/level1/p10_pushBoxes/map1.txt b/level1/p10_pushBoxes/map1.txt
new file mode 100644
index 00000000..c7297da6
--- /dev/null
+++ b/level1/p10_pushBoxes/map1.txt
@@ -0,0 +1,8 @@
+7 7
+5 5 5 5 5 5 5
+5 0 0 2 0 0 5     
+5 0 0 0 0 0 5        
+5 0 0 1 0 0 5          
+5 0 0 0 0 0 5 
+5 0 3 0 0 0 5
+5 5 5 5 5 5 5 
diff --git a/level1/p10_pushBoxes/map2.txt b/level1/p10_pushBoxes/map2.txt
new file mode 100644
index 00000000..4b789ad3
--- /dev/null
+++ b/level1/p10_pushBoxes/map2.txt
@@ -0,0 +1,11 @@
+10 10
+5 5 5 5 5 5 5 5 5 5
+5 2 0 0 0 0 0 0 0 5 
+5 0 1 0 0 0 0 3 0 5 
+5 0 0 0 0 0 0 0 0 5 
+5 0 0 0 5 5 0 0 0 5 
+5 0 0 0 5 5 0 0 0 5 
+5 0 0 0 0 0 0 0 0 5 
+5 0 3 0 0 0 0 1 0 5 
+5 0 0 0 0 0 0 0 0 5 
+5 5 5 5 5 5 5 5 5 5 
diff --git a/level1/p10_pushBoxes/map3.txt b/level1/p10_pushBoxes/map3.txt
new file mode 100644
index 00000000..530d7467
--- /dev/null
+++ b/level1/p10_pushBoxes/map3.txt
@@ -0,0 +1,13 @@
+12 12
+5 5 5 5 5 5 5 5 5 5 5 5
+5 2 0 0 0 0 0 0 0 0 0 5
+5 0 3 0 0 3 0 1 0 0 0 5
+5 0 0 0 5 0 0 0 5 0 0 5
+5 0 0 0 5 0 0 0 5 0 0 5
+5 0 0 0 5 0 1 0 5 0 0 5
+5 0 0 0 5 0 0 0 5 0 0 5
+5 0 0 0 5 5 5 5 5 0 0 5
+5 0 1 0 0 0 0 0 0 0 0 5
+5 5 5 0 0 0 0 0 0 3 0 5
+5 5 5 0 0 0 0 0 0 0 0 5
+5 5 5 5 5 5 5 5 5 5 5 5
diff --git a/level1/p10_pushBoxes/pushboxes.cpp b/level1/p10_pushBoxes/pushboxes.cpp
new file mode 100644
index 00000000..7371c6a0
--- /dev/null
+++ b/level1/p10_pushBoxes/pushboxes.cpp
@@ -0,0 +1,105 @@
+//  □ stand for box      v==1
+//  ■ stand for player   v==2
+//  ○ stand for the place the box should be put in   v===3
+//  ● stand for the place with a box in it     v==4
+//  █ stand for block       v==5
+#include<cstdio>
+#include<cstdio>
+#include<cstdlib>
+#include<conio.h>
+const int maxn=20;
+int get_d(){
+	char ch=getch();
+	if (ch==-32){
+		ch=getch();
+		if (ch==72) return 2;
+		if (ch==80) return 1;
+		if (ch==75) return 3;
+		if (ch==77) return 4;
+		return 0;
+	}
+	return 0;	
+}
+int mov[5][2]={{0,0},{1,0},{-1,0},{0,-1},{0,1}};
+struct pushbox{
+	int map[maxn][maxn];
+	int width,height;
+	int length,sumlength,score;
+	int remain;
+	int player_x,player_y;
+	void init(){
+		remain=0;
+		for(int i=1;i<=height;i++)
+			for(int j=1;j<=width;j++) {
+				if(map[i][j]==1) remain++;
+				if(map[i][j]==2) {player_x=i,player_y=j;}
+			} 
+	}
+	void print(){
+		for(int i=1;i<=height;i++){
+			for(int j=1;j<=width;j++)
+				if (!map[i][j]) printf("  ");
+				else if (map[i][j]==1) printf("□");   
+				else if (map[i][j]==2) printf("■");     
+				else if (map[i][j]==3) printf("○");       
+				else if (map[i][j]==4) printf("●");
+				else if (map[i][j]==5) printf("█");     
+			printf("\n");
+		}
+	} 
+	int one_step(int d){
+		int nx=player_x+mov[d][0];
+		int ny=player_y+mov[d][1];
+		if (nx>=1&&nx<=height)
+		if (ny>=1&&ny<=width) 
+		if (map[nx][ny]!=5&&map[nx][ny]!=4&&map[nx][ny]!=3)
+				if (map[nx][ny]==0) {map[nx][ny]=2;map[player_x][player_y]=0;player_x=nx;player_y=ny;}
+				if (map[nx][ny]==1){
+					int nnx=nx+mov[d][0],nny=ny+mov[d][1];
+					if (nnx>=1&&nnx<=height)
+					if (nny>=1&&nny<=width)
+						if (map[nnx][nny]==0) { map[nx][ny]=2;map[nnx][nny]=1;map[player_x][player_y]=0; player_x=nx;player_y=ny;}
+						if (map[nnx][nny]==3) { map[nx][ny]=2;map[nnx][nny]=4;map[player_x][player_y]=0; remain--;player_x=nx;player_y=ny;}
+				}
+		if (remain) return 0;
+		return 1;
+	}
+	
+	void load(int level){
+		FILE *fp;
+		if (level==1) 	fp = fopen("map1.txt","r");
+		if (level==2)   fp = fopen("map2.txt","r");
+		if (level==3)   fp = fopen("map3.txt","r");
+
+		fscanf(fp,"%d%d",&width,&height);
+		for(int i=1;i<=height;i++)
+			for(int j=1;j<=width;j++) fscanf(fp,"%d",&map[i][j]);
+		fclose(fp);
+	}
+
+	
+	
+}game;
+
+void game_start(){
+	int level=1;
+	int success;
+	while (level<=3){
+		game.load(level);
+		game.init(); game.print();
+		success=0;
+		while (!success){
+			success=game.one_step(get_d());
+			system("cls");
+			game.print();			
+		}
+		system("cls");
+		printf("YOU WIN !!!  Level Up!!!");
+		level++; 
+	}
+}
+int main(){
+    game_start();
+	return 0;
+	
+}
diff --git a/level1/p11_linkedList/linkedlist.cpp b/level1/p11_linkedList/linkedlist.cpp
new file mode 100644
index 00000000..7aefe00f
--- /dev/null
+++ b/level1/p11_linkedList/linkedlist.cpp
@@ -0,0 +1,80 @@
+#include<cstdio>
+#include<cstring>
+
+using namespace std;
+
+struct Node{
+	int val,id;
+	Node* next;
+	Node(int va,int i){
+		val=va;id=i;
+		next=NULL;
+	} 
+}*head=NULL;
+int n;
+void insert(Node* &o,int v,int i){
+	if(!o){
+		o=new Node(v,i);
+		return;
+	}
+	insert(o->next,v,i);
+	return;
+}
+void print(Node* o){
+	for(;o;o=o->next){
+		printf("%d %d\n",o->val,o->id);
+	}
+	return; 
+}
+void build(Node* &o,int i){
+	if(i>n) return;
+	int a;
+	scanf("%d",&a);
+	insert(o,a,i);
+	build(o->next,i+1);
+	
+	return ;
+}
+Node* rebuild(Node* o,int i){
+	if ( i==1 ) return o; 
+	if ( i==2 ) {
+		o->next->id=1; 
+		insert(o->next,o->val,2);
+		delete o;
+		return o->next;
+	}  
+	o->next=rebuild(o->next,i-1);
+	insert(o->next,o->val,i);
+	delete o;
+	return o->next; 
+}
+Node* search(Node *o,int x){
+	if(!o) return NULL;
+	if(o->val==x) return o;
+	return search(o->next,x);
+}
+int main(){ 
+	scanf("%d",&n);
+	// the requirement 1 2
+	build(head,1);
+	print(head);
+	
+	// the requirement 3
+	head=rebuild(head,n);
+	print(head);
+	
+	// the requirement 4
+	Node* p=search(head,5);
+	if(!p){
+		printf("-1\n");
+	}
+	else {
+		printf("%d\n",p->id);
+		
+		// the requirement 5
+		Node *nextp=search(p->next,5);
+		if (!nextp) printf("-1\n");
+		else printf("%d\n",nextp->id);
+	}
+	return 0;
+}
diff --git a/level1/p12_warehouse/warehouse.cpp b/level1/p12_warehouse/warehouse.cpp
new file mode 100644
index 00000000..59a4dd37
--- /dev/null
+++ b/level1/p12_warehouse/warehouse.cpp
@@ -0,0 +1,136 @@
+//  just put save.txt and load.txt in the same direction of warehouse.cpp is ok .
+//  it doesn't matter if you don't create the two txt , my program take it in to consideration 
+
+#include<cstdio>
+#include<cstring>
+#include<cstdlib>
+
+using namespace std;
+
+struct Item{
+	int amount,id;
+	char name[10];
+	Item *next;
+	Item(int i,int n,char *s): id(i),amount(n),next(NULL) {
+		strcpy(name,s);
+	}
+	void print(){
+		printf("the name of the %d th item : %s , and the amount is %d\n",id,name,amount);
+		if (next) next->print();
+		else printf("we have these %d items above in total\n",id);
+	}
+	
+}*head=NULL;
+
+void modify(Item* &o,char* s,int amount,int sigma){  // sigma=1 is in_warehouse and sigma=-1 is out_warehouse
+	if (!o && sigma==1){                       //  the first item so the id=1
+		o=new Item(1,amount,s);
+		printf("Add successfully !\n");
+		return ;
+	}
+	if (!o && sigma==-1){
+		printf("ERROR! we don't have such item named '%s'\n",s);
+		return;
+	}
+	if ( strcmp(s,o->name) ==0 ){
+		if (sigma==1){
+			o->amount+=amount;
+			printf("Add successfully !\n");
+			return ;
+		}
+		if (sigma==-1 && amount >  o->amount ){
+			printf("ERROR! we have this item but we don't have enough, we only have %d\n",o->amount);
+			return ;
+		}
+		if (sigma==-1 && amount <= o->amount ){
+			o->amount-=amount;
+			printf("Delete successfully !\n");
+		}
+		if (o->amount==0){  // exactly out this item with no remain so attach the next to the ahead and delete this pointer 
+			Item* p=o;
+			o=o->next;
+			delete(p);  // to save memory
+			return ;
+		} 
+		return ;
+	}
+	if ( !o->next ) {   
+		if (sigma==-1) {
+			printf("ERROR! we don't have such item named '%s'\n",s);
+		}
+		else {    // is not the first item so the id is o->id + 1
+			o->next=new Item(o->id+1,amount,s);
+			printf("Add successfully !\n");
+		}
+		return ;
+	}
+	modify(o->next,s,amount,sigma);
+	return ;
+}
+
+void print_instruction(){
+	printf("please choose your requirment ,just input the number \n");
+	printf("1: Show the inventory\n");
+	printf("2: put something in storage\n");
+	printf("3：take out something from storage\n");
+	printf("4: save and end\n");
+}
+void print(){                                            //  op==1
+	if( !head ) printf("We have no storage at present \n");
+	else head->print();
+	system("pause");
+}
+
+char read_name[10];
+int read_amount;
+void add(){                                              //  op==2
+	printf("please imput the name , the amount\n");
+	scanf("%s%d",read_name,&read_amount);
+	modify(head,read_name,read_amount,1);
+	system("pause");
+}
+void delet(){                                            //  op==3
+	printf("please imput the name , the amount\n");
+	scanf("%s%d",read_name,&read_amount);
+	modify(head,read_name,read_amount,-1);
+	system("pause");
+}
+void save(){                                             //   op==4
+	FILE *fp = fopen("save.txt","w");	
+	Item *o=head;
+	while(o){
+		fprintf(fp,"%s %d\n",o->name,o->amount);
+		o=o->next;
+	}
+	fclose(fp);
+	printf("save successfully !\n press any key to END THE PROGRAM ");
+}
+void load(){
+	FILE *fp = fopen("load.txt","r");
+	while(fp && fscanf(fp,"%s%d",read_name,&read_amount)==2){
+		modify(head,read_name,read_amount,1);
+	}
+	system("cls");
+	printf("Program Start !\n");	
+	if (fp) printf(" Load successfully !") ;       // different output defends on whether we have load.txt
+	fclose(fp);
+	system("pause");
+}
+int main(){
+	load();
+	system("cls");
+	print_instruction();
+	int op;                         //  op is short for "operation" 
+	while ( scanf("%d",&op) ){
+		system("cls");
+		if (op==1) print();
+		else if (op==2) add();
+		else if (op==3) delet();
+		else if (op==4) {
+			save(); break;
+		}
+		system("cls");
+		print_instruction();
+	} 
+	return 0; 
+}