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1、 .#include #include#include#include #include /using namespace std;const int count =3;class situaction;class student public: int sno; char sname20; char sex3; int age; char depart20; char classno20; char lianx40; /public: friend void sselect(); friend void supdate(); friend void sdelet(); friend void
2、 saccount(); friend void sdisplay(); friend istream & operator (istream & in,student &stu) instu.snostu.snamestu.sexstu.agestu.departstu.classnostu.lianx; return in; friend ostream & operator ( ostream & out,student &stu) outstu.sno stu.sname stu.sex stu.age stu.depart stu.classno stu.lianxendl; ret
3、urn out; friend void xkadd(); friend void sadd();void sadd() while(1)int flag1=0; student s; cout请输入要添加的学生的学号、姓名、性别、年龄、系别、班级、联系方式s; ifstream in(e:studentfile.txt); if(!in) cout打开学生信息文件失败！endl; return ; student stu; in.read(char*)&stu,sizeof(student); while(!in.eof() if(s.sno=stu.sno) flag1=1; break;
4、 in.read(char*)&stu,sizeof(student); in.close(); if(flag1=1) cout该学生已经在文件中存在不允许添加！ endl; else ofstream out(e:studentfile.txt,ios:app); out.write(char*)&s,sizeof(student); out.close(); system(pause); break;void sselect() while(1) system(cls); cout*请选择要查询的类别：*endl; cout* 按学生学号 请按1：* endl; cout* 按学生姓名
5、请按2：*endl; cout* 按学生系别 请按3：*endl; cout* 按学生班级 请按4：*endl; cout* 返回上一级界面 请按5：*sn; while(sn5|sn1) cout选择的数据无效，请重新输入：sn; coutendl; ifstream in(e:studentfile.txt); if(!in) cout打开学生信息文件失败！endl; return ; int flag=0; switch(sn) case 1: int no; cout请输入要查询的学生的学号no; student stu; in.read(char*)&stu,sizeof(stude
6、nt); while(!in.eof() if(no=stu.sno) coutstuendl; flag=1; in.read(char*)&stu,sizeof(student); break; case 2: char name20; cout请输入要查询的学生的姓名name; student stu; in.read(char*)&stu,sizeof(student); while(!in.eof() if(strcpy(name,stu.sname)=0) coutstuendl; flag=1; in.read(char*)&stu,sizeof(student); break;
7、 case 3: char dep20; cout请输入要查询的学生的系别dep; student stu; in.read(char*)&stu,sizeof(student); while(!in.eof() if(strcmp(dep,stu.depart)=0) coutstuendl; flag=1; in.read(char*)&stu,sizeof(student); break; case 4: char clno20; cout请输入要查询的学生的班级clno; student stu; in.read(char*)&stu,sizeof(student); while(!in.eof() if(strcmp(clno,stu.classno)=0) coutstuendl; flag=1; in.read(char*)&stu,sizeof(student); break; case 5: return ; in.close(); if(flag=0) cout要查询的学生在文件不存在！ endl; system(pause); void supdate() while(1) system(cls); cout*请选择按下列类别查询后修改：*endl; cout* 按学生学号 请按1：* endl; cout* 按学生姓名 请按2：*endl;
