diff --git a/03.cpp b/03.cpp
new file mode 100644
index 0000000..10b2dde
--- /dev/null
+++ b/03.cpp
@@ -0,0 +1,425 @@
+#include<stdio.h>
+#include<string.h>
+#include<stdlib.h>
+#include<windows.h>
+#define N 100
+struct student
+{
+char id[10];
+char name[25];
+char sex[10];
+int age;
+char jiguan[25];
+char xibie[25];
+char zhuanye[25];
+int ban;
+}stu[N];
+void menu() 
+{
+int choice,w1;
+void add();void find();void shanchu();void change();void tongji();void read();void input();
+do
+{
+puts("\t--------------------------------------------------------");
+		puts("\t|                    欢迎使用学籍管理系统              |");
+		puts("\t|------------------------------------------------------|");
+		puts("\t|                    1.录入学生资料                    |");
+		puts("\t|                    2.查找学生资料                    |");
+		puts("\t|                    3.删除学生资料                    |");
+		puts("\t|                    4.修改学生资料                    |");
+		puts("\t|                    5.按学号或专业输出学生资料        |");
+		puts("\t|                    6.查看所有学生资料                |");
+		puts("\t|                    7.退出系统                        |");
+		puts("\t--------------------------------------------------------");
+		printf("想选择的功能：");
+
+scanf("%d",&choice);
+if(choice<1||choice>8)
+{w1=1;system("cls");printf("菜单选择错，请重新选择！\n");}
+else w1=0;
+}while(w1==1);
+switch (choice) 
+{
+case 1:        
+add();
+break;
+case 2:
+find();
+break;
+case 3:
+shanchu();
+break;
+case 4:
+change();
+break;
+case 5:
+tongji();
+break;
+case 6:
+read();
+break;
+case 7:
+break;
+default: exit(0);
+}
+}
+int load()
+{
+FILE *fp;
+int i;
+if ((fp=fopen("results.txt","rb"))==NULL)
+{
+printf("文件打开错误");
+return 0;
+}
+for (i=0;!feof(fp);i++)fread(&stu[i],sizeof(struct student),1,fp);
+fclose(fp);
+return(i-1);
+}
+void save(int n)
+{
+int i;
+FILE *fp;
+if ((fp=fopen("results.txt","wb"))==NULL)
+{
+printf("文件打开错误:");
+}
+for (i=0;i<n;i++)fwrite(&stu[i],sizeof(struct student),1,fp);
+fclose(fp);
+}
+void read()
+{
+int n,m;
+n=load();
+printf("学号\t姓名\t性别\t年龄\t籍贯\t系别\t专业\t班级\t");
+for (m=0;m<n;m++)
+{
+printf("\n%s",stu[m].id);
+printf("\t%s",stu[m].name);
+printf("\t%s",stu[m].sex);
+printf("\t%d",stu[m].age);
+printf("\t%s",stu[m].jiguan);
+printf("\t%s",stu[m].xibie);
+printf("\t%s",stu[m].zhuanye);
+printf("\t%d",stu[m].ban);
+}
+{
+int xz,choice;  
+do
+{
+printf("\n1-返回主菜单；2-退出系统\n");
+scanf("%d",&choice);
+if(choice<1||choice>2)
+{xz=1;system("cls");printf("输入错误，请重新选择！\n");}
+else xz=0;
+}while(xz==1);
+switch(choice)
+{
+case 1:
+menu(); break; 
+case 2:
+exit(0); break; 
+}
+}
+}
+void add()
+{
+FILE *fp;
+int i,n,m;
+n=load();
+if ((fp=fopen("results.txt","wb"))==NULL)
+{
+printf("文件打开错误!\n");
+exit(1);
+}
+printf("你想要录入多少个学生信息?");
+scanf("%d",&m);
+for (i=0;i<m;i++)
+{
+printf("\n学号:");
+scanf("%s",stu[n+i].id);
+printf("姓名:");
+scanf("%s",stu[n+i].name);
+printf("性别:");
+scanf("%s",stu[n+i].sex);
+printf("年龄:");
+scanf("%d",&stu[n+i].age);
+printf("籍贯:");
+scanf("%s",stu[n+i].jiguan);
+printf("系别:");
+scanf("%s",stu[n+i].xibie);
+printf("专业:");
+scanf("%s",stu[n+i].zhuanye);
+printf("班级:");
+scanf("%d",&stu[n+i].ban);
+printf("输入完成");
+save(n+m);
+}
+for (i=0;i<m;i++)fwrite(&stu[i],sizeof(struct student),1,fp);
+fclose(fp);
+{
+int xz,choice;  
+do
+{
+printf("\n1-返回主菜单；2-退出系统\n");
+scanf("%d",&choice);
+if(choice<1||choice>2)
+{xz=1;system("cls");printf("输入错误，请重新选择！\n");}
+else xz=0;
+}while(xz==1);
+switch(choice)
+{
+case 1:
+menu(); break; 
+case 2:
+exit(0); break; 
+}
+}
+}
+void find()
+{
+int meau();
+int n,i;
+char m[10];
+n=load();
+printf("\t\t\t欢迎使用学号查找功能\n请输入你需要查找的学生的学号:");
+scanf("%s",&m);
+for (i=0;i<n;i++)
+{ if (!strcmp(stu[i].id,m))
+{
+printf("学号\t姓名\t性别\t年龄\t籍贯\t系别\t专业\t班级\n");
+printf("%s",stu[i].id);
+printf("\t%s",stu[i].name);
+printf("\t%s",stu[i].sex);
+printf("\t%d",stu[i].age);
+printf("\t%s",stu[i].jiguan);
+printf("\t%s",stu[i].xibie);
+printf("\t%s",stu[i].zhuanye);
+printf("\t%d\n",stu[i].ban);
+}
+}
+{
+int xz,choice;  
+do
+{
+printf("\n1-返回主菜单；2-退出系统\n");
+scanf("%d",&choice);
+if(choice<1||choice>2)
+{xz=1;system("cls");printf("输入错误，请重新选择！\n");}
+else xz=0;
+}while(xz==1);
+switch(choice)
+{
+case 1:
+menu(); break; 
+case 2:
+exit(0); break;
+}
+}
+}
+void change()
+{
+int n,i,j;
+char m[10];
+n=load();
+printf("欢迎使用修改功能\n输入你要修改学生的学号:");
+scanf("%s",&m);
+for (i=0;i<n;i++)
+{
+if (!strcmp(stu[i].id,m))
+{
+printf("你要修改的项目：\n1)学号2)姓名3)性别4)年龄5)籍贯6)系别7)专业8)班级\n");
+printf("你选择的功能是:");
+scanf("%d",&j);
+switch (j)
+{
+case 1:
+printf("输入你修改后的学号:");
+scanf("%s",stu[i].id);
+break;
+case 2:
+printf("输入你修改后的姓名:");
+scanf("%s",stu[i].name);
+break;
+case 3:
+printf("输入你修改后的性别:");
+scanf("%s",stu[i].sex);
+break;
+case 4:
+printf("输入你修改后的年龄:");
+scanf("%d",&stu[i].age);
+break;
+case 5:
+printf("输入你修改后的籍贯:");
+scanf("%s",stu[i].jiguan);
+break;
+case 6:
+printf("输入你修改后的系别:");
+scanf("%s",stu[i].xibie);
+break;
+case 7:
+printf("输入你修改后的专业:");
+scanf("%s",stu[i].zhuanye);
+break;
+case 8:
+printf("输入你修改后的班级:");
+scanf("%d",&stu[i].ban);
+break;
+default :
+printf("选择的功能错误\n");
+int getch();
+change();
+break;
+}
+save(n);
+}
+}
+{
+int xz,choice;  
+do
+{
+printf("\n1-返回主菜单；2-退出系统\n");
+scanf("%d",&choice);
+if(choice<1||choice>2)
+{xz=1;system("cls");printf("输入错误，请重新选择！\n");}
+else xz=0;
+}while(xz==1);
+switch(choice)
+{
+case 1:
+menu(); break; 
+case 2:
+exit(0); break; 
+}
+}
+}
+void tongji_1()
+{
+int n,i,sum=0;
+char m[10];
+n=load();
+printf("输入你要统计的学号:");
+scanf("%s",&m);
+printf("学号\t姓名\t性别\t年龄\t籍贯\t系别\t专业\t班级\n");
+for (i=0;i<n;i++)
+if (!strcmp(stu[i].id,m))
+{
+printf("%s",stu[i].id);
+printf("\t%s",stu[i].name);
+printf("\t%s",stu[i].sex);
+printf("\t%d",stu[i].age);
+printf("\t%s",stu[i].jiguan);
+printf("\t%s",stu[i].xibie);
+printf("\t%s",stu[i].zhuanye);
+printf("\t%d\n",stu[i].ban);
+sum++;
+printf("%s学号的学生共有%d个\n",m,sum);}
+}
+void tongji_2()  
+{
+int n,i,sum=0;
+char m[25];
+n=load();
+printf("输入你要统计的专业:");
+scanf("%s",&m);
+printf("学号\t姓名\t性别\t年龄\t籍贯\t专业\t班级\n");
+for (i=0;i<n;i++)
+if (!strcmp(m,stu[i].zhuanye))
+{
+printf("%s",stu[i].id);
+printf("\t%s",stu[i].name);
+printf("\t%s",stu[i].sex);
+printf("\t%d",stu[i].age);
+printf("\t%s",stu[i].jiguan);
+printf("\t%s",stu[i].xibie);
+printf("\t%s",stu[i].zhuanye);
+printf("\t%d\n",stu[i].ban);
+sum++;
+printf("%s专业的学生共有%d个/n",m,sum);}
+}
+void tongji()
+{
+int n,m;
+n=load();
+printf("欢迎使用统计功能\n你想统计的项目是:1)  学号\t2)  专业\n");
+printf("输入你想选择的功能:");
+scanf("%d",&m);
+switch (m)
+{
+case 1:
+tongji_1();
+break;
+case 2:
+tongji_2();
+break;
+default :
+printf("选择的功能错误\n");
+int getch();
+tongji();
+break;
+}
+{
+int xz,choice;  
+do
+{
+printf("\n1-返回主菜单；2-退出系统\n");
+scanf("%d",&choice);
+if(choice<1||choice>2)
+{xz=1;system("cls");printf("输入错误，请重新选择！\n");}
+else xz=0;
+}while(xz==1);
+switch(choice)
+{
+case 1:
+menu(); break;
+case 2:
+exit(0); break; 
+}
+}
+}
+void shanchu()
+{
+int n,i,j;
+char m[10];
+n=load();
+printf("输入你要删除资料学生的学号");
+scanf("%s",&m);
+for (i=0;i<n;i++)
+if (!strcmp(stu[i].id,m))
+{
+for (j=i;j<n-1;j++)
+{
+strcpy(stu[j].id,stu[j+1].id);
+strcpy(stu[j].name,stu[j+1].name);
+stu[j].age=stu[j+1].age;
+strcpy(stu[j].jiguan,stu[j+1].jiguan);
+strcpy(stu[j].xibie,stu[j+1].xibie);
+strcpy(stu[j].zhuanye,stu[j+1].zhuanye);
+strcpy(stu[j].sex,stu[j+1].sex);
+stu[j].ban=stu[j+1].ban;
+}
+save(n-1);}
+{
+int xz,choice;  
+do
+{
+printf("\n1-返回主菜单；2-退出系统\n");
+scanf("%d",&choice);
+if(choice<1||choice>2)
+{xz=1;system("cls");printf("输入错误，请重新选择！\n");}
+else xz=0;
+}while(xz==1);
+switch(choice)
+{
+case 1:
+menu(); break; 
+case 2:
+exit(0); break; 
+}
+}
+}
+int main()
+{
+menu();
+}
+