diff --git a/通信工程1802—李清宇.c b/通信工程1802—李清宇.c
new file mode 100644
index 0000000..9760eff
--- /dev/null
+++ b/通信工程1802—李清宇.c
@@ -0,0 +1,250 @@
+#include<stdio.h>
+#include<stdlib.h>
+#include<conio.h>
+#include<string.h>
+struct infor {
+	char ID[50];
+	char NAME[50];
+	float PRICE;
+	long  NUMBER;
+}g[1000],m[1000],x;
+struct inf {
+	char id[50];
+	char name[50];
+	float price;
+	long  number;
+}c;
+ //struct infor g[1000];
+ FILE *p;
+ void menu_s();
+ void input();
+ void output();
+ void check();
+ void updata();
+ void add();
+ void dele();
+ void dele2();
+ int len();
+  int len2();
+ int main()
+ {
+ 	system("cls");//����
+	int n;
+	menu_s();
+	scanf("%d",&n);
+	while(n)
+	{
+	system("cls");
+	
+		switch(n)
+		{
+			case 1:
+			input() ;break;
+			case 2:
+			output();break;
+			case 3:
+			updata();break;
+			case 4:
+			check();break;
+			case 5:
+			 return 0;
+		} 
+		getch();
+		menu_s();
+		scanf("%d",&n);
+	 }
+}
+	 void menu_s ()
+{
+	printf("----------------------------\n"); 
+	printf("***********���˵�***********\n");
+	printf("*********1:��Ʒ���*********\n");
+	printf("*********2:��Ʒ����*********\n");
+	printf("*********3:���¿��*********\n");
+	printf("*********4:��ѯ���*********\n");
+	printf("*********5:�˳�ϵͳ*********\n");
+	printf("*********������ѡ��*********\n");
+	printf("----------------------------\n"); 
+}
+void input()
+{    
+     int i=0,s;
+	//struct infor g;
+	char next[2]="y";
+	p=fopen("1.txt","wb+");
+	if(p==NULL)
+	{
+		printf("���ļ�ʧ��\n");
+		fclose(p);
+		exit(0);
+	}
+	while(strcmp(next,"y")==0||strcmp(next,"Y")==0)
+	{   
+		printf("\n��������Ʒ���\n");
+		scanf("%s",g[i].ID );
+		printf("\n��������Ʒ����\n");
+		scanf("%s",&g[i].NAME );
+		printf("\n��������Ʒ�۸�\n");
+	    scanf("%f",&g[i].PRICE );
+	    printf("\n��������Ʒ����\n");
+	    scanf("%d",&g[i].NUMBER );
+		fwrite(&g[i],sizeof(struct infor),1,p);/*���ļ�д������*/
+		printf("\n�������루y(Y)/n(N)��\n");
+		fflush(stdin);//��ջ�������
+		i++;
+		//next=getch();
+		scanf("%s",next);
+	}
+	fclose(p);	 
+}
+int len()//��ȡ��ǰ�ļ����� 
+{    int z=0;
+	p=fopen("1.txt","r+");
+	if(p==NULL)
+	{
+		printf("���ļ�ʧ��\n");
+		exit(1);
+    }
+     rewind(p);//���ļ�ָ�������ļ���ͷ��
+      while(!feof(p))
+     {
+    if((fread(&g[z],sizeof(struct infor),1,p))==1);
+    z++;
+    }
+    fclose(p);
+    return z-1;
+}
+int len2()//��ȡ��ǰ�ļ����� 
+{    int z=0;
+    FILE *fp;
+	fp=fopen("3.txt","r+");
+	if(fp==NULL)
+	{
+		printf("���ļ�ʧ��\n");
+		exit(1);
+    }
+     rewind(fp);//���ļ�ָ�������ļ���ͷ��
+      while(!feof(fp))
+     {
+    if((fread(&c,sizeof(struct inf),1,fp))==1);
+    z++;
+    }
+    fclose(fp);
+    return z;
+}
+   void check()
+{   
+    int i,s=0;
+	long length;
+	p=fopen("1.txt","rb+");
+	if(p==NULL)
+	{
+		printf("���ļ�ʧ��\n");
+		exit(1);
+    }
+     printf("\n----------------------------------------------------\n��Ʒ�б�\n----------------------------------------------------\n");
+     printf("���\t\tƷ��\t\t�۸�\t\t����\n");
+     rewind(p);//���ļ�ָ�������ļ���ͷ��
+     /* while(!feof(p))
+     {
+    if((fread(&g[s],sizeof(struct infor),1,p))==1);
+    s++;
+    }*/
+    s=len();
+    rewind(p);
+    fread(g,sizeof(struct infor),s,p);
+    for(i=0;i<s;i++)
+    printf("%-10s\t%s\t\t%.1f\t\t%ld\n",g[i].ID ,g[i].NAME ,g[i].PRICE,g[i].NUMBER  );
+    printf("----------------------------------------------------\n");
+	fclose(p);
+}
+ void output()
+{
+	FILE *p,*fp;
+	char a[50],next[2]="y";
+	int i,j,l,sum=0,num=0,s;
+	p=fopen("1.txt","rb+");
+	fp=fopen("3.txt","wb+");
+	while(strcmp(next,"y")==0||strcmp(next,"Y")==0)
+	{
+	 l=len();
+	printf("�������۳�����Ʒ����\n");
+	scanf("%s",&a[50]);
+	 	  for(i=0;i<l;i++)
+	   {
+	   	fseek(p,sizeof(struct infor)*(i),0);
+	   	fscanf(p,"%s%s%d%d",&c.id ,&c.name ,&c.price ,&c.number );
+	   	 //printf("%-10s\t%s\t\t%.1f\t\t%ld\n",c.id ,c.name ,c.price ,c.number);
+	   	if(strcmp(a,c.name )==0)
+	   	{ 
+	   	    fwrite(&c,sizeof(struct inf),1,fp);
+		   printf("%-10s\t%s\t\t%.1f\t\t%ld\n",c.id ,c.name ,c.price ,c.number);
+		    fclose(p);
+		    void dele2( char a[50] );
+		    sum++;
+	    }
+	}
+	fclose(fp);
+     printf("\n�������루y(Y)/n(N)��\n");
+	 scanf("%s",next);
+}    
+    s=len2();
+	fp=fopen("3.txt","rb+");
+	printf("\n----------------------------------------------------\n��Ʒ�б�\n----------------------------------------------------\n");
+     for(i=0;i<s;i++)
+	   {
+	   	fseek(fp,sizeof(struct inf)*(i),0);
+	   	fscanf(fp,"%s%s%d%d",&c.id ,&c.name ,&c.price ,&c.number );
+	   	num+=c.price ;
+	   	printf("%-10s\t%s\t\t%.1f\t\t%ld\n",c.id ,c.name ,c.price ,c.number);
+	   	printf("�����۶\t\t\t\t\t%d\n",num);
+	   	}
+	   	fclose(fp);
+    printf("----------------------------------------------------");
+}
+
+void updata()
+{   
+    int a;
+	printf("\n��ѡ��1ɾ����Ʒ��Ϣ��2������Ʒ��Ϣ\n");
+	scanf("%d",&a);
+	switch(a)
+{  
+  case 2:add();break;
+}
+}
+void add()
+{	 
+    FILE *P;
+    int i=0;
+    char next[2]="y";
+
+	//i=len();
+	//fseek(p,0l,2);
+		while(strcmp(next,"y")==0||strcmp(next,"Y")==0)
+	{   
+		printf("\n��������Ʒ���\n");
+		scanf("%s",&g[i].ID );
+		printf("\n��������Ʒ����\n");
+		scanf("%s",&g[i].NAME );
+		printf("\n��������Ʒ�۸�\n");
+	    scanf("%f",&g[i].PRICE );
+	    printf("\n��������Ʒ����\n");
+	    scanf("%d",&g[i].NUMBER );
+		
+			p=fopen("1.txt","ab");
+	if(p==NULL)
+	{
+		printf("���ļ�ʧ��\n");
+		exit(0);
+	}
+	fwrite(&g[i],sizeof(struct infor),1,p);/*���ļ�д������*/
+	fclose(p);
+		printf("\n�������루y(Y)/n(N)��\n");		
+		//fflush(stdin);//��ջ�������
+		//i++;
+		//next=getch();
+		scanf("%s",next);
+	}
+	    
+ } 
diff --git a/通信工程1802—李清宇.exe b/通信工程1802—李清宇.exe
new file mode 100644
index 0000000..4579c85
Binary files /dev/null and b/通信工程1802—李清宇.exe differ