学生信息管理系统C++课程设计，适合新手

#include <iostream> #include <conio.h> #include <iomanip> #include <windows.h> #define swap(a,b) {a = ( (a + b) - (b = a) );}//两个数交换 using namespace std; //数据结构 struct node { char name[16];//姓名 int iNum;//学号 char sex[10];//性别 int score;//分数 node *next; }; struct node *head = NULL; static int count ; //记录学生人数 //函数 void login();//登录界面 void meau();//用户选择界面 void addStu();//增加学生信息 void deletStu();//删除学生信息 void changeStu();//修改学生信息 void findStu();//查找学生信息 void showStu();//显示学生信息 void sortStu();//根据学号排序 void saveFile();//退出写入文件 void readFile();//打开读取文件 void changeName(node* pCurr);//修改姓名 void changeNum(node* pCurr);//修改学号 void changeSex(node* pCurr);//修改性别 void changeScore(node* pCurr);//修改分数 int main() { login(); return 0; } void login() {//登录界面 char userName[16] = {0}; char passWord[16] = {0}; char username[16] = {0};//存储文件中读取的用户名 char password[16] = {0};//存储文件中读取的密码 int ch; int iCount = 1;//记录输入密码的次数,超过三次退出系统 FILE *fp = fopen("user.txt","r"); if (NULL == fp) { cout << "user.txt打开失败!~~" << endl; return; } fscanf(fp, "%s%s", username, password); fclose(fp); while(iCount <= 3) { int i = 0; cout << "\t\t\t******************************" << endl; cout << "\t\t\t 欢迎登录学生管理系统 " << endl; cout << "\t\t\t 请输入验证信息 " << endl; cout << "\t\t\t******************************" << endl; cout << endl; cout << "\t\t\t用户名:"; fflush(stdin); gets(userName); cout << "\t\t\t密 码:"; fflush(stdin); while ( ( ch = getch() ) != 13) {//13表示回车不换行即'\r',实际情况:在密码输入时不换行，连续输入。 if (ch != 8) {//Backspace passWord[i++] = ch; putchar('*'); } else { if (i > 0) { passWord[--i] = '\0'; cout << '\b'; putchar(' '); cout << '\b'; } else putchar(7);//响铃 } } passWord[i] = '\0'; cout << endl; system("cls"); if (strcmp(userName,username) == 0 && strcmp(passWord,password) == 0) { cout << "\t\t\t恭喜您!登录成功!~~" << endl; meau(); } else { if (3 == iCount) { cout << "\t\t\t验证次数超过3次,退出本系统!~~" << endl; cout << "\t\t\t"; exit(1); } cout << "\t\t\t登陆失败!请重新登录~!" << endl; iCount++; } } } void meau() { int choice = 0; readFile();//从文件中读入链表 while (1) { cout << "\t\t\t******************************" << endl; cout << "\t\t\t 1--增加学生信息" << endl; cout << "\t\t\t 2--删除学生信息" << endl; cout << "\t\t\t 3--修改学生信息" << endl; cout << "\t\t\t 4--查找学生信息" << endl; cout << "\t\t\t 5--显示学生信息" << endl; cout << "\t\t\t 6--退出系统" << endl; cout << "\t\t\t******************************" << endl; cout << "\t\t\t请输入你的选择<1-6>:"; fflush(stdin); cin >> choice; system("cls"); switch(choice) { case 1: addStu(); sortStu();//输入结束后对学生信息按学号排序 break; case 2: deletStu(); break; case 3: changeStu(); break; case 4: findStu(); break; case 5: showStu(); break; case 6: cout << "\t\t\t谢谢使用本学生管理系统~" << endl; saveFile(); cout << "\t\t\t"; exit(0); default: cout << "\t\t\t不存在此操作!请重新输入选择~" << endl; } } } node *pre = NULL;//指向pCurr的前一个结点 void addStu() {//增加学生信息 char ch; while (1) { system("cls"); node *pCurr = new node; if (head == NULL) { head = pCurr; cout << "\t\t\t请输入学生姓名:"; fflush(stdin); gets(pCurr -> name); cout << "\t\t\t请输入学生学号:"; fflush(stdin); cin >> pCurr -> iNum; cout << "\t\t\t请输入学生性别:"; fflush(stdin); gets(pCurr -> sex); cout << "\t\t\t请输入学生成绩<0-100>:"; fflush(stdin); cin >> pCurr ->score; if (pCurr -> score < 0 || pCurr -> score > 100) { cout << "\t\t\t分数输入错误!~~请修改!" << endl; changeScore(pCurr); } pre = pCurr; pCurr -> next = NULL; count++; } else { cout << "\t\t\t请输入学生姓名:"; fflush(stdin); gets(pCurr -> name); while(1) { node* pMul = head; cout << "\t\t\t请输入学生学号:"; fflush(stdin); cin >> pCurr -> iNum; while (NULL != pMul ) { if (pMul -> iNum == pCurr -> iNum) { cout << "\t\t\t学号重复!~~请重新输入学号!~~" << endl; break; } else pMul = pMul -> next; } if (pMul == NULL) { break; } } cout << "\t\t\t请输入学生性别:"; fflush(stdin); gets(pCurr -> sex); cout << "\t\t\t请输入学生成绩<0-100>:"; fflush(stdin); cin >> pCurr ->score; if (pCurr -> score < 0 || pCurr -> score > 100) { cout << "\t\t\t分数输入错误!~~请修改!" << endl; changeScore(pCurr); } pre -> next = pCurr; pre = pCurr; pCurr -> next = NULL; count++; } cout << "\t\t\t此学生信息保存成功!~~" << endl; cout << "\t\t\t是否继续输入信息?~~(Y/N):"; while (1) { fflush(stdin); ch = getchar(); if ( ch == 'N' || ch == 'n') { system("cls"); return; } else if (ch == 'Y' || ch == 'y') { system("cls"); break; } else { cout << "\t\t\t选择错误!~~请重新输入!~~(Y/N):"; continue; } } } } void showStu() {//显示所有学生信息 if (head == NULL) { cout << "还没有学生信息!" << endl; return; } node *pCurr = head; while (pCurr != NULL) { cout << "\t" << "姓名:" << pCurr -> name << "\t" << "学号:" << pCurr -> iNum << "\t" << "性别:" << pCurr -> sex << "\t" << "分数:" << pCurr -> score << endl; pCurr = pCurr -> next; } } void findStu() {//查找学生信息 if (head == NULL) { cout << "还没有学生信息!" << endl; return; } node *pCurr = head; int ID = 0; cout << "\t\t\t请输入要查找的学生的学号:"; cin >> ID; while (pCurr != NULL) { if (ID == pCurr -> iNum) { cout << "\t\t\t该生信息如下所示:" << endl; cout << "\t" << "姓名:" << pCurr -> name << "\t" << "学号:" << pCurr -> iNum << "\t" << "性别:" << pCurr -> sex << "\t" << "分数:" << pCurr -> score << endl; //if (pCurr -> next == NULL) return; } pCurr = pCurr -> next; } if (pCurr == NULL) cout << "\t\t\t不存在该学生~~!" << endl; } void deletStu() {//删除学生信息 if (head == NULL) { cout << "\t\t\t还没有学生信息!" << endl; return; } node *pCurr = head; node *pree = head; int ID = 0; char ch; cout << "\t\t\t请输入要删除的学生的学号:"; cin >> ID; while (pCurr != NULL) { //system("cls"); if (head -> iNum == ID) { cout << "\t\t\t要删除的该生信息如下所示:" << endl; cout << "\t" << "姓名:" << pCurr -> name << "\t" << "学号:" << pCurr -> iNum << "\t" << "性别:" << pCurr -> sex << "\t" << "分数:" << pCurr -> score << endl; cout << "\t\t\t是否真的要删除(Y/N):"; fflush(stdin); if(( ch = getchar() ) == 'Y') { head = pCurr -> next; pree = head; delete pCurr; count--; cout << "\t\t\t删除成功!~~" << endl; if (count == 0)//链表为空时,head和pre为空,直接退出 { pre = head = NULL; return; } return; } else if ( ch == 'N') { system("cls"); return; } else { cout << "\t\t\t选择错误!~~请重新输入!~~~" << endl; Sleep(1000); system("cls"); continue; } } else { if (pCurr -> iNum == ID) { cout << "\t\t\t要删除的该生信息如下所示:" << endl; cout << "\t" << "姓名:" << pCurr -> name << "\t" << "学号:" << pCurr -> iNum << "\t" << "性别:" << pCurr -> sex << "\t" << "分数:" << pCurr -> score << endl; cout << "\t\t\t是否真的要删除(Y/N):"; fflush(stdin); if(( ch = getchar() ) == 'Y') {