帮我写一个学生信息管理系统的C语言程序

好的，我可以回答这个问题。以下是一个简单的学生信息管理系统的C语言程序：

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

#define MAX_STUDENTS 100

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

struct student students[MAX_STUDENTS];
int num_students = ;

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 GPA: ");
scanf("%f", &s.gpa);

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

void print_student(struct student s) {
printf("%s (ID: %d, GPA: %.2f)\n", s.name, s.id, s.gpa);
}

void print_all_students() {
int i;
for (i = ; i < num_students; i++) {
print_student(students[i]);
}
}

void search_student() {
char name[50];
printf("Enter student name to search: ");
scanf("%s", name);

int i;
for (i = ; i < num_students; i++) {
if (strcmp(students[i].name, name) == ) {
print_student(students[i]);
return;
}
}

printf("Student not found\n");
}

int main() {
int choice;

while (1) {
printf("1. Add student\n");
printf("2. Print all students\n");
printf("3. Search student\n");
printf("4. Quit\n");
printf("Enter your choice: ");
scanf("%d", &choice);

switch (choice) {
case 1:
add_student();
break;
case 2:
print_all_students();
break;
case 3:
search_student();
break;
case 4:
exit();
default:
printf("Invalid choice\n");
}
}

return ;
}