（创作不易，感谢有你，你的支持，就是我前行的最大动力，如果看完对你有帮助，请留下您的足迹）
今天我们来试着用链表创建一个学生成绩管理系统
其中主要包含的知识点为单链表(http://t.csdn.cn/gsAdH)和C语言文件操作(http://t.csdn.cn/j3kwe) 相关知识点的链接我已经给出
总体代码就是这样，如果大家发现bug或者有更好的方法 ，欢迎大家一起来讨论呀，一起加油
#define _CRT_SECURE_NO_WARNINGS 1 #include<stdio.h> #include<stdlib.h> #include<conio.h> #include<string.h> //学生信息 typedef struct student { char stuNum[20]; char name[20]; int score; }Student; //节点信息 typedef struct node { Student student; struct node* next; }node; void welcome() { printf("**** 链式学生管理系统 *******\n"); printf("*******************************\n"); printf("****0.退出功能 1.录入功能******\n"); printf("****2.打印功能 3.统计功能******\n"); printf("****4.查找功能 5.修改功能******\n"); printf("****6.删除功能 7.排序功能******\n"); printf("*******************************\n"); } //保存学生信息 void savestudent(node* head) { //打开文件 FILE* file = fopen("C:\\Users\\周星辰\\Desktop\\学生成绩管理系统.txt", "w"); if (file == NULL) { printf("打开文件失败\n"); return; } node* move = head->next; while (move != NULL) { //写入文件 if (fwrite(&move->student, sizeof(student), 1, file) != 1) { printf("保存%s出现错误\n", move->student.name); return; } move = move->next; } //关闭文件 fclose(file); } //录入学生信息 void inputstudent(node*head) { node* fresh = (node*)malloc(sizeof(node)); fresh->next = NULL; printf("请输入学生学号\n"); scanf("%s", fresh->student.stuNum); printf("请输入学生姓名\n"); scanf("%s", fresh->student.name); printf("请输入学生成绩\n"); scanf("%d", &fresh->student.score); node* move = head; while (move->next != NULL) { move = move->next; } //将学生插入到尾部 move->next = fresh; savestudent(head); system("cls");//清屏 printf("学生信息录入成功\n"); system("pause");//暂停程序 system("cls");//清屏 } //打印学生信息 void printStudent(node* head) { node* move = head->next; printf("%10s\t%10s\t%10s\n","学号","姓名","成绩"); while (move != NULL) { /*printf("学号:%s 姓名：%s 成绩：%d\n", move->student.stuNum, move->student.name, move->student.score);*/ printf("%10s\t%10s\t%10d\n", move->student.stuNum, move->student.name, move->student.score); move = move->next; } system("pause");//暂停程序 system("cls");//清屏 } //统计总人数 void countstudent(node* head) { node* move = head->next; int count = 0; while (move != NULL) { count++; move = move->next; } printf("学生总人数为：%d\n", count); system("pause");//暂停程序 system("cls");//清屏 } //查找学生信息 void findstudent(node* head) { printf("请输入学生的学号：\n"); char a[20]; scanf("%s", a); node* move = head->next; while (move != NULL) { if (strcmp(move->student.stuNum, a) == 0) { printf("%10s\t%10s\t%10s\n", "学号", "姓名", "成绩"); printf("%10s\t%10s\t%10d\n", move->student.stuNum, move->student.name, move->student.score); system("pause");//暂停程序 system("cls");//清屏 return; } move = move->next; } printf("未找到学生信息\n"); system("pause");//暂停程序 system("cls");//清屏 } //读取学生信息 void loadstudent(node* head) { //打开文件 FILE* file = fopen("C:\\Users\\周星辰\\Desktop\\学生成绩管理系统.txt", "r"); if (!file) { printf("未找到学生文件\n"); return; } //创建一个节点 node* fresh = (node*)malloc(sizeof(node)); fresh->next = NULL; node* move = head; while (fread(&fresh->student, sizeof(student), 1, file) == 1) { move->next = fresh; move = fresh; fresh = (node*)malloc(sizeof(node)); fresh->next = NULL; } //最后多定义一个fresh，要将它释放掉 free(fresh); //关闭文件 fclose(file); } //修改学生信息 void modifystudent(node* head) { printf("请输入要修改的学生的学号："); char a[20]; scanf("%s", &a); node* move = head->next; while (move != NULL) { if (strcmp(move->student.stuNum, a) == 0) { printf("请输入学生学号\n"); scanf("%s", move->student.stuNum); printf("请输入学生姓名\n"); scanf("%s", move->student.name); printf("请输入学生成绩\n"); scanf("%d", &move->student.score); savestudent(head); printf("修改成功\n"); system("pause");//暂停程序 system("cls");//清屏 return; } move = move->next; } printf("未找到学生信息\n"); system("pause");//暂停程序 system("cls");//清屏 } //删除学生信息 void deletestudent(node* head) { printf("输入要删除学生学号：\n"); char a[20]; scanf("%s", &a); node* move = head; while (move->next != NULL) { if (strcmp(move->next->student.stuNum, a) == 0) { node* tmp = move->next; move->next = move->next->next; free(tmp); tmp = NULL; savestudent(head); printf("删除成功\n"); system("pause");//暂停程序 system("cls");//清屏 return; } move = move->next; } printf("未找到学生信息\n"); system("pause");//暂停程序 system("cls");//清屏 } //排序 void sortstudent(node* head) { for (node* turn = head->next; turn->next != NULL; turn = turn->next) { for (node* move = head->next; move->next != NULL; move = move->next) { if (move->student.score < move->next->student.score) { student temp = move->student; move->student = move->next->student; move->next->student = temp; } } } printStudent(head); } int main() { //创建头节点 node* head = (node*)malloc(sizeof(node)); head->next = NULL; loadstudent(head); while (1) { welcome(); char c = _getch(); switch (c) { case '1': inputstudent(head); break; case '2': printStudent(head); break; case '3': countstudent(head); break; case '4': findstudent(head); break; case '5': modifystudent(head); break; case '6': deletestudent(head); break; case '7': sortstudent(head); break; case '0': printf("退出程序\n"); exit(0); break; default: printf("输入错误\n"); break; } } return 0; }
