师弟:“师兄,我最近构建了一个学生成绩管理系统,有空试用一下么?”
我:“好啊!”
一个简单的学生成绩管理系统,基本功能包括:添加学生信息、显示所有学生信息、按学号查找学生信息、按姓名查找学生信息、添加学生成绩、修改学生成绩、显示学生的平均成绩、退出系统。
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define MAX_STUDENTS 100
#define MAX_NAME_LEN 50
#define MAX_SEX_LEN 16
typedef struct {
int id; // 学号
char name[MAX_NAME_LEN]; // 姓名
float score; // 成绩
} Student;
Student students[MAX_STUDENTS]; // 学生数组
int student_count = 0; // 学生数量
void add_student()
{
Student s;
if(student_count < MAX_STUDENTS) {
printf("Enter student ID: ");
scanf("%d", &s.id);
printf("Enter student name: ");
scanf("%s", s.name);
s.score = 0.0; // 初始成绩设置为0
students[student_count++] = s;
printf("Student added successfully, all student: %d!\n", student_count);
} else {
printf("Database is full!\n");
}
}
void print_title()
{
printf("%-4s %-10s %-5s\n", "ID", "Name", "Score");
}
void display_all_students()
{
int i;
printf("-------- All students info --------\n");
if (student_count == 0) {
printf("No students!\n");
} else {
print_title();
for(i = 0; i < student_count; i++) {
printf("%-4d %-10s %-.2f\n", students[i].id, students[i].name, students[i].score);
}
}
printf("-------- End -----------\n");
}
void find_student_by_id()
{
int id, i;
printf("Enter student ID to search: ");
scanf("%d", &id);
for(i = 0; i < student_count; i++) {
if(students[i].id == id) {
print_title();
printf("%-4d %-10s %-.2f\n", students[i].id, students[i].name, students[i].score);
return;
}
}
printf("Student with ID %d not found!\n", id);
}
void find_student_by_name()
{
int i, is_find = 0;
char name[MAX_NAME_LEN];
printf("Enter student name to search: ");
scanf("%s", name);
for(i = 0; i < student_count; i++) {
if(strcmp(students[i].name, name) == 0) {
print_title();
printf("%-4d %-10s %-.2f\n", students[i].id, students[i].name, students[i].score);
is_find = 1;
}
}
if (is_find == 0) {
printf("Student with name %s not found!\n", name);
}
}
void add_score()
{
int id, i;
float score;
printf("Enter student ID: ");
scanf("%d", &id);
printf("Enter student score: ");
scanf("%f", &score);
for(i = 0; i < student_count; i++) {
if(students[i].id == id) {
students[i].score = score;
printf("Score added successfully!\n");
return;
}
}
printf("Student with ID %d not found!\n", id);
}
void display_average_score()
{
float total = 0.0;
int i;
for(i = 0; i < student_count; i++) {
total += students[i].score;
}
printf("Average score of all students: %.2f\n", total / student_count);
}
int main()
{
int choice;
do {
printf("\nStudent Score Management System\n");
printf("1. Add Student\n");
printf("2. Display All Students\n");
printf("3. Find Student by ID\n");
printf("4. Find Student by Name\n");
printf("5. Add Score\n");
printf("6. Display Average Score\n");
printf("7. Exit\n");
printf("Enter your choice: ");
scanf("%d", &choice);
switch(choice) {
case 1:
add_student();
break;
case 2:
display_all_students();
break;
case 3:
find_student_by_id();
break;
case 4:
find_student_by_name();
break;
case 5:
add_score();
break;
case 6:
display_average_score();
break;
case 7:
printf("Exiting...\n");
break;
default:
printf("Invalid choice!\n");
}
} while(choice != 7);
return 0;
}
这个系统涉及到哪些知识呢?
1、c基础库: 头文件包含基本的输入输出,基本的算术运算,字符串操作
2、使用了宏定义类型: 避免无效意义的数字
3、结构体定义: 使用typedef来定义结构体,这样结构体变量声明和定义时,就可以不用struct。如: Student s;
4、全局变量: Student students[MAX_STUDENTS] 记录学生信息;int student_count = 0 记录学生的个数;全局变量所有函数可以直接访问;其对应的是局部变量,只有函数本身可以访问。
5、字符串的比较strcmp
6、do-while循环
7、switch语句文章来源:https://www.toymoban.com/news/detail-826986.html
我说:“可以再做两点优化: 一是数据的持久化,二是学生成绩排序,三是删除学生信息。”文章来源地址https://www.toymoban.com/news/detail-826986.html
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