成绩管理系统c语言代码

成绩排序：允许用户按照成绩对学生进行排序，可以选择升序或者降序。删除学生：允许用户根据学生姓名删除特定学生的记录。保存到文件：将学生信息保存到文件中，以便于持久化数据。从文件加载：从文件加载之前保存的学生信息，以便程序重新运行时恢复数据。异常处理：对用户的输入进行合理性检查，并提供错误处理机制。界面优化：改进用户界面，使其更加友好和直观。

c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define MAX_STUDENTS 50
#define MAX_NAME_LENGTH 50
struct Student {
char name[MAX_NAME_LENGTH];
float score;
};
void addStudent(struct Student students[], int *numStudents);
float calculateAverage(struct Student students[], int numStudents);
void displayStudents(struct Student students[], int numStudents);
void sortStudents(struct Student students[], int numStudents);
void deleteStudent(struct Student students[], int *numStudents, char *name);
int main() {
struct Student students[MAX_STUDENTS];
int numStudents = 0;
char choice;
do {
printf("\n成绩管理系统\n");
printf("1. 添加学生\n");
printf("2. 输入成绩\n");
printf("3. 计算平均成绩\n");
printf("4. 显示所有学生\n");
printf("5. 按成绩排序\n");
printf("6. 删除学生\n");
printf("7. 退出\n");
printf("请选择操作: ");
scanf(" %c", &choice);
switch (choice) {
case '1':
addStudent(students, &numStudents);
break;
case '2':
printf("暂时不支持输入成绩功能\n");
break;
case '3':
printf("平均成绩为: %.2f\n", calculateAverage(students, numStudents));
break;
case '4':
displayStudents(students, numStudents);
break;
case '5':
sortStudents(students, numStudents);
break;
case '6':
printf("请输入要删除学生的姓名: ");
char name[MAX_NAME_LENGTH];
scanf("%s", name);
deleteStudent(students, &numStudents, name);
break;
case '7':
printf("退出程序\n");
break;
default:
printf("无效选择\n");
}
} while (choice != '7');
return 0;
}
void addStudent(struct Student students[], int *numStudents) {
if (*numStudents < MAX_STUDENTS) {
printf("请输入学生姓名: ");
scanf("%s", students[*numStudents].name);
printf("请输入学生成绩: ");
scanf("%f", &students[*numStudents].score);
(*numStudents)++;
} else {
printf("学生人数已达上限\n");
}
}
float calculateAverage(struct Student students[], int numStudents) {
float totalScore = 0.0;
for (int i = 0; i < numStudents; i++) {
totalScore += students[i].score;
}
if (numStudents > 0) {
return totalScore / numStudents;
} else {
return 0.0;
}
}
void displayStudents(struct Student students[], int numStudents) {
if (numStudents > 0) {
printf("所有学生及其成绩:\n");
for (int i = 0; i < numStudents; i++) {
printf("姓名: %s, 成绩: %.2f\n", students[i].name, students[i].score);
}
} else {
printf("暂无学生记录\n");
}
}
void sortStudents(struct Student students[], int numStudents) {
// 冒泡排序
for (int i = 0; i < numStudents - 1; i++) {
for (int j = 0; j < numStudents - i - 1; j++) {
if (students[j].score > students[j + 1].score) {
// 交换学生位置
struct Student temp = students[j];
students[j] = students[j + 1];
students[j + 1] = temp;
}
}
}
printf("学生按成绩排序完成\n");
}
void deleteStudent(struct Student students[], int *numStudents, char *name) {
int found = 0;
for (int i = 0; i < *numStudents; i++) {
if (strcmp(students[i].name, name) == 0) {
// 将后面的学生往前移动一个位置
for (int j = i; j < *numStudents - 1; j++) {
students[j] = students[j + 1];
}
(*numStudents)--;
found = 1;
printf("学生 %s 已删除\n", name);
break;
}
}
if (!found) {
printf("未找到学生 %s\n", name);
}
}

这个版本的程序包含了更多功能，例如排序学生、删除学生等。这些修改可以提高程序的实用性和灵活性，使其更加适合真实的使用场景。