学生选修课管理系统 C课程设计.doc

#includeiostream.h #includestring.h #includefstream.h #include stdlib.h #include time.h //using namespace std; const int count =3; class situaction; class student { public: int sno; char sname[20]; char sex[3]; int age; char depart[20]; char classno[20]; char lianx[40]; //public: friend void sselect(); friend void supdate(); friend void sdelet(); friend void 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; return 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endl; cins; 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;} 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 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：*************endl; int sn; cinsn; while(sn5||sn1) {