Implement student record management system

student record.c

@@ -0,0 +1,174 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+struct Student {
+    int roll;
+    char name[50];
+    float marks;
+};
+
+// Function prototypes
+void addStudent();
+void displayStudents();
+void searchStudent();
+void updateStudent();
+void deleteStudent();
+
+int main() {
+    int choice;
+
+    while(1) {
+        printf("\n\n===== STUDENT RECORD MANAGEMENT SYSTEM =====\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. Exit\n");
+        printf("Enter your choice: ");
+        scanf("%d", &choice);
+
+        switch(choice) {
+            case 1: addStudent(); break;
+            case 2: displayStudents(); break;
+            case 3: searchStudent(); break;
+            case 4: updateStudent(); break;
+            case 5: deleteStudent(); break;
+            case 6: exit(0);
+            default: printf("Invalid Choice!\n");
+        }
+    }
+    return 0;
+}
+
+// 1. ADD STUDENT RECORD
+void addStudent() {
+    struct Student s;
+    FILE *fp = fopen("students.dat", "ab");  // append binary
+
+    printf("\nEnter Roll Number: ");
+    scanf("%d", &s.roll);
+
+    printf("Enter Name: ");
+    scanf("%s", s.name);
+
+    printf("Enter Marks: ");
+    scanf("%f", &s.marks);
+
+    fwrite(&s, sizeof(s), 1, fp);
+    fclose(fp);
+
+    printf("\nStudent Added Successfully!\n");
+}
+
+// 2. DISPLAY ALL STUDENT RECORDS
+void displayStudents() {
+    struct Student s;
+    FILE *fp = fopen("students.dat", "rb");
+
+    if(fp == NULL) {
+        printf("No Records Found.\n");
+        return;
+    }
+
+    printf("\n==== STUDENT LIST ====\n");
+    while(fread(&s, sizeof(s), 1, fp)) {
+        printf("\nRoll Number : %d", s.roll);
+        printf("\nName        : %s", s.name);
+        printf("\nMarks       : %.2f\n", s.marks);
+    }
+
+    fclose(fp);
+}
+
+// 3. SEARCH STUDENT BY ROLL NUMBER
+void searchStudent() {
+    struct Student s;
+    int roll, found = 0;
+
+    printf("\nEnter Roll Number to Search: ");
+    scanf("%d", &roll);
+
+    FILE *fp = fopen("students.dat", "rb");
+
+    while(fread(&s, sizeof(s), 1, fp)) {
+        if(s.roll == roll) {
+            printf("\nRecord Found!\n");
+            printf("Roll Number: %d\n", s.roll);
+            printf("Name       : %s\n", s.name);
+            printf("Marks      : %.2f\n", s.marks);
+            found = 1;
+            break;
+        }
+    }
+
+    if(!found)
+        printf("No Record Found for Roll Number %d\n", roll);
+
+    fclose(fp);
+}
+
+// 4. UPDATE STUDENT RECORD
+void updateStudent() {
+    struct Student s;
+    int roll, found = 0;
+
+    printf("\nEnter Roll Number to Update: ");
+    scanf("%d", &roll);
+
+    FILE *fp = fopen("students.dat", "rb+");
+
+    while(fread(&s, sizeof(s), 1, fp)) {
+        if(s.roll == roll) {
+            printf("\nEnter New Name: ");
+            scanf("%s", s.name);
+
+            printf("Enter New Marks: ");
+            scanf("%f", &s.marks);
+
+            fseek(fp, -sizeof(s), SEEK_CUR);
+            fwrite(&s, sizeof(s), 1, fp);
+
+            printf("Record Updated Successfully!\n");
+            found = 1;
+            break;
+        }
+    }
+
+    if(!found)
+        printf("Record Not Found!\n");
+
+    fclose(fp);
+}
+
+// 5. DELETE A STUDENT RECORD
+void deleteStudent() {
+    struct Student s;
+    int roll, found = 0;
+
+    printf("\nEnter Roll Number to Delete: ");
+    scanf("%d", &roll);
+
+    FILE *fp = fopen("students.dat", "rb");
+    FILE *temp = fopen("temp.dat", "wb");
+
+    while(fread(&s, sizeof(s), 1, fp)) {
+        if(s.roll != roll) {
+            fwrite(&s, sizeof(s), 1, temp);
+        } else {
+            found = 1;
+        }
+    }
+
+    fclose(fp);
+    fclose(temp);
+
+    remove("students.dat");
+    rename("temp.dat", "students.dat");
+
+    if(found)
+        printf("Record Deleted Successfully!\n");
+    else
+        printf("Record Not Found!\n");
+}