用c语言写一个学生成绩管理系统

好的，以下是一个简单的学生成绩管理系统的 C 语言代码：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define MAX_STUDENTS 100

struct student {
char name[50];
int id;
float grade;
};

struct student students[MAX_STUDENTS];
int num_students = 0;

void add_student() {
if (num_students >= MAX_STUDENTS) {
printf("Error: too many students\n");
return;
}

struct student s;
printf("Enter student name: ");
scanf("%s", s.name);
printf("Enter student ID: ");
scanf("%d", &s.id);
printf("Enter student grade: ");
scanf("%f", &s.grade);

students[num_students] = s;
num_students++;
}

void print_students() {
printf("Name\tID\tGrade\n");
for (int i = 0; i < num_students; i++) {
printf("%s\t%d\t%.2f\n", students[i].name, students[i].id, students[i].grade);
}
}

int main() {
while (1) {
printf("Enter command (add, print, quit): ");
char command[10];
scanf("%s", command);

if (strcmp(command, "add") == 0) {
add_student();
} else if (strcmp(command, "print") == 0) {
print_students();
} else if (strcmp(command, "quit") == 0) {
break;
} else {
printf("Error: invalid command\n");
}
}

return 0;
}

这个程序可以让用户添加学生信息，包括姓名、学号和成绩，并且可以打印出所有学生的信息。