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495 | #define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <windows.h>
typedef struct Student {
char name[50];
char ID[20] = { 0 };
float score[4];
float sum;
struct Student* next;
} Student;
// 全局变量，指向链表头节点
Student* head = NULL;
int count = 0; // 统计数量
// 插入学生信息
void insertStudent() {
Student* newStudent = (Student*)malloc(sizeof(Student));
if (newStudent == NULL) {
printf("内存分配失败！\a\n");
exit(1);
}
newStudent->sum = 0.0;
printf("请输入学生姓名: ");
scanf("%s", newStudent->name);
printf("请输入学生学号: ");
scanf("%s", newStudent->ID);
printf("请依次输入学生四门课程成绩: ");
for (int i = 0; i < 4; i++) {
scanf("%f", &(newStudent->score[i]));
newStudent->sum += newStudent->score[i];
}
newStudent->next = NULL;
// 如果链表为空，将新节点设置为头节点
if (head == NULL) {
head = newStudent;
}
else {
// 否则，遍历链表找到最后一个节点，并将新节点插入到最后
Student* current = head;
while (current->next != NULL) {
current = current->next;
}
current->next = newStudent;
}
printf("学生信息插入成功！\n");
count++;
}
// 删除学生信息
void deleteStudent() {
if (head == NULL) {
printf("链表为空，无法删除学生信息！\a\n");
return;
}
char studentID[20] = { 0 };
printf("请输入要删除的学生学号: ");
scanf("%s", studentID);
Student* current = head;
Student* prev = NULL;
// 遍历链表查找要删除的学生节点
while (current != NULL && strcmp(current->ID, studentID) != 0) {
prev = current;
current = current->next;
}
// 如果找到了要删除的学生节点
if (current != NULL) {
// 如果要删除的学生节点是头节点
if (prev == NULL) {
head = current->next;
}
else {
prev->next = current->next;
}
free(current);
free(prev);
printf("学生信息删除成功！\n");
count--;
}
else {
printf("未找到学号为%s的学生信息！\a\n", studentID);
}
}
// 查询学生信息
void queryStudent() {
if (head == NULL) {
printf("链表为空，无学生信息！\a\n");
return;
}
char studentID[20] = { 0 };
printf("请输入要查询的学生学号: ");
scanf("%s", studentID);
Student* current = head;
// 遍历链表查找要查询的学生节点
while (current != NULL && strcmp(current->ID, studentID) != 0) {
current = current->next;
}
// 如果找到了要查询的学生节点
if (current != NULL) {
printf("\n");
printf("学生姓名: %s\n", current->name);
printf("学生学号: %s\n", current->ID);
printf("学生成绩: ");
for (int i = 0; i < 4; i++) {
printf("%.2f ", current->score[i]);
}
printf("\n");
printf("学生总成绩: %.2f\n", current->sum);
}
else {
printf("未找到学号为%s的学生信息！\a\n", studentID);
}
}
// 排名学生信息
void rankStudents() {
if (head == NULL) {
printf("链表为空，无学生信息！\a\n");
return;
}
// 创建一个临时数组，用于存储学生信息
int length = 0;
Student* current = head;
while (current != NULL) {
length++;
current = current->next;
}
Student** students = (Student**)malloc(sizeof(Student*) * length);
if (students == NULL) {
printf("内存分配失败，程序意外退出！\a\n");
exit(1);
}
current = head;
for (int i = 0; i < length; i++) {
students[i] = current;
current = current->next;
}
// 使用冒泡排序对学生信息按总成绩进行排序
for (int i = 0; i < length - 1; i++) {
for (int j = 0; j < length - 1 - i; j++) {
if (students[j]->sum < students[j + 1]->sum) {
Student* temp = students[j];
students[j] = students[j + 1];
students[j + 1] = temp;
}
}
}
printf("学生成绩排名如下：\n");
for (int i = 0; i < length; i++) {
printf("\n");
printf("排名 %d:\n", i + 1);
printf("姓名: %s\n", students[i]->name);
printf("学号: %s\n", students[i]->ID);
printf("成绩:\n");
for (int j = 0; j < 4; j++) {
printf(" 科目 %d: %.2f\n", j + 1, students[i]->score[j]);
}
printf("总成绩: %.2f\n", students[i]->sum);
printf("--------------------\n");
}
free(students);
}
// 修改学生信息
void modifyStudent() {
if (head == NULL) {
printf("链表为空，无学生信息！\a\n");
return;
}
char studentID[20] = { 0 };
printf("请输入要修改的学生学号: ");
scanf("%s", studentID);
Student* current = head;
// 遍历链表查找要修改的学生节点
while (current != NULL && strcmp(current->ID, studentID) != 0) {
current = current->next;
}
// 如果找到了要修改的学生节点
if (current != NULL) {
current->sum = 0.00;
printf("\n******************************\n");
printf("*** 请选择要修改的学生信息 ***\n");
printf("** **\n");
printf("** 1: 姓名 **\n");
printf("** 2: 学号 **\n");
printf("** 3: 课程 **\n");
printf("** 0: 退出 **\n");
printf("** **\n");
printf("******************************\n\n");
int function;
scanf("%d", &function);
while (function != 0) {
switch (function) {
case 1: {
printf("请输入学生姓名: ");
scanf("%s", current->name);
printf("学生信息修改成功！\n");
break;
}
case 2: {
printf("请输入学生学号: ");
scanf("%s", current->ID);
printf("学生信息修改成功！\n");
break;
}
case 3: {
printf("请输入学生四门课程成绩: ");
for (int i = 0; i < 4; i++) {
scanf("%f", &(current->score[i]));
current->sum += current->score[i];
}
printf("学生信息修改成功！\n");
break;
}
default: {
printf("输入错误，请重新输入：\a");
scanf("%d", &function);
break;
}
}
printf("\n请再次选择操作：");
scanf("%d", &function);
}
}
else {
printf("未找到学号为%s的学生信息！\a\n", studentID);
}
}
// 导出学生信息至文件
void exportToFile() {
if (head == NULL) {
printf("链表为空，无学生信息！\a\n");
return;
}
char filename[50] = { 0 };
printf("请输入导出文件的名称: ");
scanf("%s", filename);
FILE* file = fopen(filename, "w");
if (file == NULL) {
printf("无法打开文件！\a\n");
return;
}
Student* current = head;
while (current != NULL) {
fprintf(file, "Name: %s\n", current->name);
fprintf(file, "ID: %s\n", current->ID);
fprintf(file, "Score: ");
for (int i = 0; i < 4; i++) {
fprintf(file, "%.2f ", current->score[i]);
}
fprintf(file, "\n");
fprintf(file, "Sum: %.2f\n", current->sum);
fprintf(file, "\n");
current = current->next;
}
fclose(file);
printf("学生信息已成功导出到文件%s！\n", filename);
}
// 由文件导入学生信息
void readFromFile() {
char filename[50] = { 0 };
printf("请输入要导入的文件名: ");
scanf("%s", filename);
FILE* file = fopen(filename, "r");
if (file == NULL) {
printf("无法打开文件！\a\n");
return;
}
Student* current = NULL;
Student* previous = NULL;
while (1) {
Student* newStudent = (Student*)malloc(sizeof(Student));
if (newStudent == NULL) {
printf("内存分配失败，程序意外退出！\a\n");
exit(1);
}
if (fscanf(file, "Name: %s\n", newStudent->name) != 1)
break;
count++;
fscanf(file, "ID: %s\n", newStudent->ID);
fscanf(file, "Score: ");
for (int i = 0; i < 4; i++) {
fscanf(file, "%f", &newStudent->score[i]);
}
fscanf(file, "\n");
fscanf(file, "Sum: %f\n", &newStudent->sum);
fscanf(file, "\n");
// 注意看，这里的fsanf和导出数据函数中的fprintf并不是完全相同的。
newStudent->next = NULL;
if (current == NULL) {
current = newStudent;
head = newStudent;
}
else {
previous->next = newStudent;
current = newStudent;
}
previous = newStudent;
}
fclose(file);
printf("学生信息已成功从文件%s导入！\n", filename);
}
// 显示学生信息
void displayStudents() {
if (head == NULL) {
printf("链表为空，无学生信息！\a\n");
return;
}
Student* current = head;
while (current != NULL) {
printf("学生姓名: %s\n", current->name);
printf("学生学号: %s\n", current->ID);
printf("学生成绩: ");
for (int i = 0; i < 4; i++) {
printf("%.2f ", current->score[i]);
}
printf("\n");
printf("学生总成绩: %.2f\n", current->sum);
printf("\n");
current = current->next;
}
}
// 释放链表内存
void freeList() {
Student* current = head;
while (current != NULL) {
Student* temp = current;
current = current->next;
free(temp);
}
head = NULL;
}
void logo() {
int time = 5;
while (time) {
printf(" \n");
printf(" JJJJJJJJJJJ OOOOOOOOO KKKKKKKKK KKKKKKKEEEEEEEEEEEEEEEEEEEEEERRRRRRRRRRRRRRRRR \n");
printf(" J:::::::::J OO:::::::::OO K:::::::K K:::::KE::::::::::::::::::::ER::::::::::::::::R \n");
printf(" J:::::::::J OO:::::::::::::OO K:::::::K K:::::KE::::::::::::::::::::ER::::::RRRRRR:::::R \n");
printf(" JJ:::::::JJO:::::::OOO:::::::OK:::::::K K::::::KEE::::::EEEEEEEEE::::ERR:::::R R:::::R\n");
printf(" J:::::J O::::::O O::::::OKK::::::K K:::::KKK E:::::E EEEEEE R::::R R:::::R\n");
printf(" J:::::J O:::::O O:::::O K:::::K K:::::K E:::::E R::::R R:::::R\n");
printf(" J:::::J O:::::O O:::::O K::::::K:::::K E::::::EEEEEEEEEE R::::RRRRRR:::::R \n");
printf(" J:::::j O:::::O O:::::O K:::::::::::K E:::::::::::::::E R:::::::::::::RR \n");
printf(" J:::::J O:::::O O:::::O K:::::::::::K E:::::::::::::::E R::::RRRRRR:::::R \n");
printf("JJJJJJJ J:::::J O:::::O O:::::O K::::::K:::::K E::::::EEEEEEEEEE R::::R R:::::R\n");
printf("J:::::J J:::::J O:::::O O:::::O K:::::K K:::::K E:::::E R::::R R:::::R\n");
printf("J::::::J J::::::J O::::::O O::::::OKK::::::K K:::::KKK E:::::E EEEEEE R::::R R:::::R\n");
printf("J:::::::JJJ:::::::J O:::::::OOO:::::::OK:::::::K K::::::KEE::::::EEEEEEEE:::::ERR:::::R R:::::R\n");
printf(" JJ:::::::::::::JJ OO:::::::::::::OO K:::::::K K:::::KE::::::::::::::::::::ER::::::R R:::::R\n");
printf(" JJ:::::::::JJ OO:::::::::OO K:::::::K K:::::KE::::::::::::::::::::ER::::::R R:::::R\n");
printf(" JJJJJJJJJ OOOOOOOOO KKKKKKKKK KKKKKKKEEEEEEEEEEEEEEEEEEEEEERRRRRRRR RRRRRRR\n");
printf(" \n");
printf(" \n");
//printf("倒计时 %d 秒！", time--);
printf("\033[1;36;41m倒计时 %d 秒！\033[m\n", time--);
Sleep(1000);
system("cls");
}
}
int main() {
logo();
while (1) {
printf("\n********************************************\n");
printf("************** 学生成绩管理系统 ************\n");
printf("** **\n");
printf("** \033[1;36;41m当前系统中有 %d 份数据！\033[m **\n", count);
printf("** **\n");
printf("** 1: 插入学生信息 **\n");
printf("** 2: 删除学生信息 **\n");
printf("** 3: 查询学生信息 **\n");
printf("** 4: 显示学生信息 **\n");
printf("** 5: 排名学生信息 **\n");
printf("** 6: 修改学生信息 **\n");
printf("** 7: 导出信息至文件 **\n");
printf("** 8: 由文件导入信息 **\n");
printf("** 9: 显示小组 LOGO **\n");
printf("** 10: 退出 **\n");
printf("** **\n");
printf("********************************************\n\n");
int choice;
printf("请选择操作：");
scanf("%d", &choice);
switch (choice) {
case 1:
insertStudent();
break;
case 2:
deleteStudent();
break;
case 3:
queryStudent();
break;
case 4:
displayStudents();
break;
case 5:
rankStudents();
break;
case 6:
modifyStudent();
break;
case 7:
exportToFile();
break;
case 8:
readFromFile();
break;
case 9:
system("cls");
logo();
break;
case 10:
freeList(); // 释放链表内存
exit(0);
default:
printf("无效的选择，请重新输入：\a");
scanf("%d", &choice);
break;
}
}
return 0;
}
|