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Build a complete Student Management System in C with file handling, CRUD operations, searching, sorting, and menu-driven interface. Full source code included.
This project implements a complete Student Management System using C programming. It demonstrates file handling, structures, dynamic memory, and modular programming. Students can be added, viewed, searched, updated, and deleted – with all data persisted to a file.
Project Features
- Add new student records
- Display all students
- Search by roll number or name
- Update student information
- Delete student records
- Sort by name or marks
- Calculate class statistics (average, topper)
- File-based persistent storage
Data Structure Design
Example
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#define MAX_NAME 50
#define MAX_STUDENTS 100
#define FILENAME "students.dat"
typedef struct {
int rollNo;
char name[MAX_NAME];
float marks;
char grade;
} Student;
Complete Source Code
Example
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define MAX_NAME 50
#define FILENAME "students.dat"
typedef struct {
int rollNo;
char name[MAX_NAME];
float marks;
char grade;
} Student;
// Calculate grade based on marks
char calculateGrade(float marks) {
if (marks >= 90) return 'A';
if (marks >= 80) return 'B';
if (marks >= 70) return 'C';
if (marks >= 60) return 'D';
return 'F';
}
// Add a new student
void addStudent() {
FILE *fp = fopen(FILENAME, "ab");
if (!fp) { perror("Error opening file"); return; }
Student s;
printf("\n--- Add New Student ---\n");
printf("Enter Roll Number: ");
scanf("%d", &s.rollNo);
getchar(); // consume newline
printf("Enter Name: ");
fgets(s.name, MAX_NAME, stdin);
s.name[strcspn(s.name, "\n")] = '\0'; // remove newline
printf("Enter Marks (0-100): ");
scanf("%f", &s.marks);
s.grade = calculateGrade(s.marks);
fwrite(&s, sizeof(Student), 1, fp);
fclose(fp);
printf("Student added successfully! Grade: %c\n", s.grade);
}
// Display all students
void displayAll() {
FILE *fp = fopen(FILENAME, "rb");
if (!fp) { printf("No records found.\n"); return; }
Student s;
int count = 0;
printf("\n%-8s %-30s %-8s %-6s\n", "Roll No", "Name", "Marks", "Grade");
printf("------------------------------------------------------\n");
while (fread(&s, sizeof(Student), 1, fp) == 1) {
printf("%-8d %-30s %-8.1f %-6c\n", s.rollNo, s.name, s.marks, s.grade);
count++;
}
printf("------------------------------------------------------\n");
printf("Total Students: %d\n", count);
fclose(fp);
}
// Search by roll number
void searchByRoll() {
int roll;
printf("Enter Roll Number to search: ");
scanf("%d", &roll);
FILE *fp = fopen(FILENAME, "rb");
if (!fp) { printf("No records found.\n"); return; }
Student s;
int found = 0;
while (fread(&s, sizeof(Student), 1, fp) == 1) {
if (s.rollNo == roll) {
printf("\n--- Student Found ---\n");
printf("Roll No: %d\n", s.rollNo);
printf("Name: %s\n", s.name);
printf("Marks: %.1f\n", s.marks);
printf("Grade: %c\n", s.grade);
found = 1;
break;
}
}
if (!found) printf("Student with Roll No %d not found.\n", roll);
fclose(fp);
}
// Update student record
void updateStudent() {
int roll;
printf("Enter Roll Number to update: ");
scanf("%d", &roll);
FILE *fp = fopen(FILENAME, "rb+");
if (!fp) { printf("No records found.\n"); return; }
Student s;
int found = 0;
while (fread(&s, sizeof(Student), 1, fp) == 1) {
if (s.rollNo == roll) {
printf("Current Name: %s\n", s.name);
printf("Current Marks: %.1f\n", s.marks);
getchar();
printf("Enter New Name (or press Enter to keep): ");
char newName[MAX_NAME];
fgets(newName, MAX_NAME, stdin);
newName[strcspn(newName, "\n")] = '\0';
if (strlen(newName) > 0) strcpy(s.name, newName);
printf("Enter New Marks (or -1 to keep): ");
float newMarks;
scanf("%f", &newMarks);
if (newMarks >= 0) {
s.marks = newMarks;
s.grade = calculateGrade(s.marks);
}
fseek(fp, -(long)sizeof(Student), SEEK_CUR);
fwrite(&s, sizeof(Student), 1, fp);
printf("Record updated successfully!\n");
found = 1;
break;
}
}
if (!found) printf("Student with Roll No %d not found.\n", roll);
fclose(fp);
}
// Delete student record
void deleteStudent() {
int roll;
printf("Enter Roll Number to delete: ");
scanf("%d", &roll);
FILE *fp = fopen(FILENAME, "rb");
FILE *temp = fopen("temp.dat", "wb");
if (!fp || !temp) { printf("Error!\n"); return; }
Student s;
int found = 0;
while (fread(&s, sizeof(Student), 1, fp) == 1) {
if (s.rollNo == roll) {
found = 1;
printf("Deleted: %s (Roll No: %d)\n", s.name, s.rollNo);
} else {
fwrite(&s, sizeof(Student), 1, temp);
}
}
fclose(fp);
fclose(temp);
remove(FILENAME);
rename("temp.dat", FILENAME);
if (!found) printf("Student not found.\n");
}
// Calculate class statistics
void showStatistics() {
FILE *fp = fopen(FILENAME, "rb");
if (!fp) { printf("No records found.\n"); return; }
Student s, topper;
float total = 0;
int count = 0;
float highest = -1;
while (fread(&s, sizeof(Student), 1, fp) == 1) {
total += s.marks;
count++;
if (s.marks > highest) {
highest = s.marks;
topper = s;
}
}
fclose(fp);
if (count == 0) { printf("No students.\n"); return; }
printf("\n--- Class Statistics ---\n");
printf("Total Students: %d\n", count);
printf("Class Average: %.2f\n", total / count);
printf("Highest Marks: %.1f\n", highest);
printf("Topper: %s (Roll No: %d)\n", topper.name, topper.rollNo);
}
// Main menu
void showMenu() {
printf("\n========================================\n");
printf(" STUDENT MANAGEMENT SYSTEM\n");
printf("========================================\n");
printf("1. Add Student\n");
printf("2. Display All Students\n");
printf("3. Search Student\n");
printf("4. Update Student\n");
printf("5. Delete Student\n");
printf("6. Class Statistics\n");
printf("7. Exit\n");
printf("========================================\n");
printf("Enter your choice: ");
}
int main() {
int choice;
while (1) {
showMenu();
scanf("%d", &choice);
switch (choice) {
case 1: addStudent(); break;
case 2: displayAll(); break;
case 3: searchByRoll(); break;
case 4: updateStudent(); break;
case 5: deleteStudent(); break;
case 6: showStatistics(); break;
case 7:
printf("Thank you! Exiting...\n");
return 0;
default:
printf("Invalid choice! Try again.\n");
}
}
return 0;
}
Sample Output
Output
======================================== STUDENT MANAGEMENT SYSTEM ======================================== 1. Add Student 2. Display All Students 3. Search Student 4. Update Student 5. Delete Student 6. Class Statistics 7. Exit ======================================== Enter your choice: 1 --- Add New Student --- Enter Roll Number: 101 Enter Name: Rahul Kumar Enter Marks (0-100): 85.5 Student added successfully! Grade: B Enter your choice: 2 Roll No Name Marks Grade ------------------------------------------------------ 101 Rahul Kumar 85.5 B 102 Priya Sharma 92.0 A 103 Amit Patel 78.3 C ------------------------------------------------------ Total Students: 3
How to Compile and Run
c example
// Linux/Mac
gcc -o student_mgmt student_management.c
./student_mgmt
// Windows
gcc -o student_mgmt.exe student_management.c
student_mgmt.exeProject Structure Explanation
| Component | Purpose |
|---|---|
Student struct | Data model with roll, name, marks, grade |
students.dat | Binary file for persistent storage |
| CRUD functions | Add, Read, Update, Delete operations |
| Menu system | User-friendly console interface |
| Grade calculation | Automatic grading based on marks |
| Statistics | Aggregate calculations on stored data |
Possible Enhancements
- Add sorting (by name, marks, or roll number)
- Implement search by name (partial matching)
- Add multiple subjects with individual marks
- Export data to CSV format
- Add login/password protection
- Implement pagination for large datasets
Interview Questions
Q: Why use binary file mode ("rb"/"wb") instead of text mode? Binary mode preserves the exact struct bytes, making fread/fwrite work correctly. Text mode may translate newlines and corrupt binary data.
Q: How would you handle duplicate roll numbers? Before inserting, search the file for the roll number. If found, reject the insertion or prompt the user.
Q: What's the limitation of this approach? File-based storage with fread/fwrite is simple but not efficient for large datasets. For better performance, use indexed files or a database.
Summary
This Student Management System demonstrates fundamental C concepts including structures, file I/O, menu-driven programs, and data persistence. It's a great portfolio project that showcases your ability to build complete, functional applications in C. The modular design makes it easy to extend with additional features.
Exam Focus
Revise definitions, diagrams, examples, and short-answer points for Student Management System in C – Complete Project with Source Code.
Interview Use
Prepare one clear explanation, one practical example, and one common mistake for this C Programming topic.
Search Terms
c-programming, c programming, programming, projects, student, management, system, student management system in c – complete project with source code
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