![MSMS by C.jpg](https://files.peakd.com/file/peakd-hive/brain-less/23zkZxPYnNWjSqZYfspneV3gFF4Ye3aZb4rBvCuo7qSh3P66BbgfDkUjyboJaF4bLkLGy.jpg) As a software engineering student, I have to do something with my C program per semester. In this series semester, I worked on the Medical Store Management System in C Language. Below is the description of my project. Firstly : Headers, Structures, and Utility Functions #include #include #include #include #include #define MAX 100 // ---- Structures ---- struct User { char username[30]; char password[30]; char role[10]; }; struct Medicine { int id; char name[50]; char company[50]; char category[30]; int quantity; float price; char expiry[15]; }; struct SaleLog { char customer[50]; char medicine[50]; int quantity; float total; char date[20]; }; // ---- Utility Functions ---- void clearInputBuffer() { int c; while ((c = getchar()) != '\n' && c != EOF) {} } void getInput(const char *prompt, char *buffer, int size) { printf("%s", prompt); if (fgets(buffer, size, stdin) != NULL) buffer[strcspn(buffer, "\n")] = '\0'; } int caseInsensitiveStrstr(const char *haystack, const char *needle) { char h[MAX], n[MAX]; int i; for (i = 0; haystack[i] && i < MAX-1; i++) h[i] = tolower(haystack[i]); h[i] = 0; for (i = 0; needle[i] && i < MAX-1; i++) n[i] = tolower(needle[i]); n[i] = 0; return strstr(h, n) != NULL; } Explanation : Headers: Needed for input/output, strings, file handling, time, etc. Structures: User: stores login info. Medicine: full info about medicines. SaleLog: customer purchase history. Utility Functions: clearInputBuffer() → flush input buffer. getInput() → safe string input. caseInsensitiveStrstr() → search medicine name ignoring case. ![UPDATE INTERFACE.jpg](https://files.peakd.com/file/peakd-hive/brain-less/23t6zyWeMjLmUB4HijbYK5vxvrBMMDUMzrVMDMN849SdZydpnZ3mKhmyPCL2XQ9agwkFj.jpg) Here, from the beginning user have to login to the system as a user/amin/stuff , with valid password. After successfully login to the system you can chose what he wants to do . Add Medicine , Update Medicine , Delete Medicine , Search , Sort , Billing , Sales Report , Check low stock and Expiry , Change Password , Backup , Restore , Logout . ###### **User Management** char currentUser[30] = ""; char currentRole[10] = ""; // ---- Function Declarations ---- void registerUser(); void login(); void logout(); void changePassword(const char username[]); void logSession(const char username[], const char mode[]); int isAdmin(); int isStaff(); // ---- Implementations ---- void registerUser() { FILE *fp = fopen("use.txt", "a"); struct User u; if (fp == NULL) { printf("Error opening file!\n"); return; } printf("\n--- Register (First Time) ---\n"); printf("Enter username (no space): "); scanf("%29s", u.username); clearInputBuffer(); printf("Enter password (no space): "); scanf("%29s", u.password); clearInputBuffer(); do { printf("Enter role (admin/staff): "); scanf("%9s", u.role); clearInputBuffer(); } while (strcmp(u.role, "admin") != 0 && strcmp(u.role, "staff") != 0); fprintf(fp, "%s %s %s\n", u.username, u.password, u.role); fclose(fp); printf("User registered successfully!\n"); } void login() { FILE *fp; struct User u; char uname[30], pass[30]; int found = 0; fp = fopen("use.txt", "r"); if (!fp || fgetc(fp) == EOF) { if (fp) fclose(fp); registerUser(); } else fclose(fp); while (!found) { fp = fopen("use.txt", "r"); if (!fp) { printf("Error opening user file.\n"); exit(1); } printf("\nLogin\nUsername: "); scanf("%29s", uname); clearInputBuffer(); printf("Password: "); scanf("%29s", pass); clearInputBuffer(); while (fscanf(fp, "%29s %29s %9s", u.username, u.password, u.role) == 3) { if (strcmp(u.username, uname) == 0 && strcmp(u.password, pass) == 0) { strcpy(currentUser, uname); strcpy(currentRole, u.role); logSession(uname, "login"); printf("Login successful!\n"); found = 1; break; } } fclose(fp); if (!found) printf("Invalid username or password. Try again.\n"); } } void logout() { logSession(currentUser, "logout"); printf("Logged out successfully.\n"); } void logSession(const char username[], const char mode[]) { FILE *fp = fopen("session_log.txt", "a"); if (!fp) return; time_t now = time(NULL); fprintf(fp, "%s %s at %s", username, mode, ctime(&now)); fclose(fp); } void changePassword(const char username[]) { FILE *fp = fopen("use.txt", "r"); struct User users[100]; int count = 0, found = 0; char newPass[30]; if (!fp) { printf("User file not found.\n"); return; } while (fscanf(fp, "%29s %29s %9s", users[count].username, users[count].password, users[count].role) == 3) { count++; } fclose(fp); printf("Enter new password (no space): "); scanf("%29s", newPass); clearInputBuffer(); for (int i = 0; i < count; i++) { if (strcmp(users[i].username, username) == 0) { strcpy(users[i].password, newPass); found = 1; break; } } if (!found) { printf("User not found.\n"); return; } fp = fopen("use.txt", "w"); for (int i = 0; i < count; i++) { fprintf(fp, "%s %s %s\n", users[i].username, users[i].password, users[i].role); } fclose(fp); printf("Password updated successfully.\n"); } int isAdmin() { return strcmp(currentRole, "admin") == 0; } int isStaff() { return strcmp(currentRole, "staff") == 0; } **## Explanation** registerUser() → Creates new admin/staff account. login() → Validates user credentials. logout() → Ends session and logs it. changePassword() → Lets users update password. isAdmin()/isStaff() → Role-based access control. **Medicine Management** // ---- Function Declarations ---- int getUniqueMedicineID(); void addMedicine(); void updateMedicine(); void deleteMedicine(); void searchMedicine(); void sortMedicines(); void checkLowStock(); void checkExpiry(); // ---- Implementations ---- int getUniqueMedicineID() { int id; FILE *fp = fopen("medicines.txt", "r"); struct Medicine med; int unique = 1; do { unique = 1; printf("Enter Medicine ID: "); if (scanf("%d", &id) != 1) { clearInputBuffer(); printf("Invalid input! Please enter a number.\n"); continue; } clearInputBuffer(); if (fp) { rewind(fp); while (fscanf(fp, "%d|%49[^|]|%49[^|]|%f|%29[^|]|%d|%14[^\n]\n", &med.id, med.name, med.company, &med.price, med.category, &med.quantity, med.expiry) == 7) { if (med.id == id) { unique = 0; printf("This ID already exists! Try another.\n"); break; } } } } while (!unique); if (fp) fclose(fp); return id; } void addMedicine() { FILE *fp = fopen("medicines.txt", "a"); struct Medicine med; if (!fp) { printf("Error opening medicine file.\n"); return; } printf("\n<<<< Add Medicine >>>>\n"); med.id = getUniqueMedicineID(); getInput("Medicine Name: ", med.name, sizeof(med.name)); getInput("Company: ", med.company, sizeof(med.company)); printf("Price: "); while (scanf("%f", &med.price) != 1) { clearInputBuffer(); printf("Invalid input! Enter Price: "); } clearInputBuffer(); getInput("Category: ", med.category, sizeof(med.category)); printf("Quantity: "); while (scanf("%d", &med.quantity) != 1) { clearInputBuffer(); printf("Invalid input! Enter Quantity: "); } clearInputBuffer(); getInput("Expiry Date (dd-mm-yyyy): ", med.expiry, sizeof(med.expiry)); fprintf(fp, "%d|%s|%s|%.2f|%s|%d|%s\n", med.id, med.name, med.company, med.price, med.category, med.quantity, med.expiry); fclose(fp); printf("Medicine added successfully!\n"); } // (updateMedicine(), deleteMedicine(), searchMedicine(), // sortMedicines(), checkLowStock(), checkExpiry() implemented here) // (Already written in your original program) Explanation getUniqueMedicineID() → Ensures unique IDs. addMedicine() → Add new medicine. updateMedicine() → Modify stock & price. deleteMedicine() → Remove medicine by ID. searchMedicine() → Case-insensitive search. sortMedicines() → Sorts medicines alphabetically. checkLowStock() → Detect low stock. checkExpiry() → Detect expired medicines. **Billing & Sales Report** // ---- Function Declarations ---- void billing(); void salesReport(); // ---- Implementations ---- void billing() { FILE *fp = fopen("medicines.txt", "r"); FILE *temp = fopen("temp_medicines.txt", "w"); FILE *sales = fopen("sales.txt", "a"); struct Medicine med; struct SaleLog s; int id, qty, found = 0; char line[256]; time_t t = time(NULL); struct tm tm = *localtime(&t); if (!fp || !temp || !sales) { printf("Error opening file(s).\n"); if (fp) fclose(fp); if (temp) fclose(temp); if (sales) fclose(sales); return; } getInput("Customer Name: ", s.customer, sizeof(s.customer)); printf("Medicine ID for sell: "); while (scanf("%d", &id) != 1) { printf("Enter valid number!\n"); clearInputBuffer(); } clearInputBuffer(); printf("Quantity: "); while (scanf("%d", &qty) != 1) { printf("Enter valid number!\n"); clearInputBuffer(); } clearInputBuffer(); while (fgets(line, sizeof(line), fp)) { int res = sscanf(line, "%d|%49[^|]|%49[^|]|%f|%29[^|]|%d|%14[^\n]", &med.id, med.name, med.company, &med.price, med.category, &med.quantity, med.expiry); if (res != 7) { fputs(line, temp); continue; } if (med.id == id) { found = 1; if (med.quantity >= qty) { med.quantity -= qty; s.quantity = qty; strcpy(s.medicine, med.name); s.total = med.price * qty; sprintf(s.date, "%02d-%02d-%04d", tm.tm_mday, tm.tm_mon + 1, tm.tm_year + 1900); fprintf(sales, "%s|%s|%d|%.2f|%s\n", s.customer, s.medicine, s.quantity, s.total, s.date); printf("Bill: %.2f\n", s.total); } else { printf("Not enough stock!\n"); } } fprintf(temp, "%d|%s|%s|%.2f|%s|%d|%s\n", med.id, med.name, med.company, med.price, med.category, med.quantity, med.expiry); } fclose(fp); fclose(temp); fclose(sales); if (!found) { printf("Medicine Not Found!\n"); remove("temp_medicines.txt"); } else { remove("medicines.txt"); rename("temp_medicines.txt", "medicines.txt"); } } void salesReport() { FILE *fp = fopen("sales.txt", "r"); if (!fp) { printf("Error opening sales file.\n"); return; } printf("\n --- Sales Report ---\n"); char line[256]; struct SaleLog s; while (fgets(line, sizeof(line), fp)) { int ok = sscanf(line, "%49[^|]|%49[^|]|%d|%f|%19[^\n]", s.customer, s.medicine, &s.quantity, &s.total, s.date); if (ok == 5) { printf("Customer: %s | Medicine: %s | Qty: %d | Total: %.2f | Date: %s\n", s.customer, s.medicine, s.quantity, s.total, s.date); } } fclose(fp); } **## Explanation** billing() → Handles medicine sale, updates stock, records sale. salesReport() → Displays history of all sales. **# Backup, Restore, and Main Menu** // ---- Backup & Restore ---- void backup() { FILE *src, *dst; char line[512]; src = fopen("medicines.txt", "r"); dst = fopen("medicines_backup.txt", "w"); if (!src || !dst) { printf("Error opening files for medicine backup.\n"); return; } while (fgets(line, sizeof(line), src)) fputs(line, dst); fclose(src); fclose(dst); src = fopen("sales.txt", "r"); dst = fopen("sales_backup.txt", "w"); if (!src || !dst) { printf("Error opening files for sales backup.\n"); return; } while (fgets(line, sizeof(line), src)) fputs(line, dst); fclose(src); fclose(dst); printf("Backup Completed Successfully.\n"); } void restore() { FILE *src, *dst; char line[512]; src = fopen("medicines_backup.txt", "r"); dst = fopen("medicines.txt", "w"); if (!src || !dst) { printf("Error opening Medicine Backup files.\n"); return; } while (fgets(line, sizeof(line), src)) fputs(line, dst); fclose(src); fclose(dst); src = fopen("sales_backup.txt", "r"); dst = fopen("sales.txt", "w"); if (!src || !dst) { printf("Error opening Sales Backup files.\n"); return; } while (fgets(line, sizeof(line), src)) fputs(line, dst); fclose(src); fclose(dst); printf("Restore Completed Successfully!\n"); } // ---- Main Function ---- int main() { int choice; login(); while (1) { printf("\n||------- Medical Store System Menu -------||\n"); if (isAdmin()) { printf("1. Add Medicine\n2. Update Medicine\n3. Delete Medicine\n4. Search Medicine\n"); printf("5. Sort Medicines\n6. Billing\n7. Sales Report\n8. Check Low Stock\n9. Check Expiry\n"); printf("10. Change Password\n11. Backup\n12. Restore\n13. Logout\n"); } else if (isStaff()) { printf("1. Search Medicine\n2. Sort Medicines\n3. Billing\n4. Check Low Stock\n"); printf("5. Change Password\n6. Logout\n"); } else { printf("Role not recognized. Exiting.\n"); exit(1); } printf("Enter choice: "); if (scanf("%d", &choice) != 1) { clearInputBuffer(); printf("Invalid input! Please enter a number.\n"); continue; } clearInputBuffer(); if (isAdmin()) { switch (choice) { case 1: addMedicine(); break; case 2: updateMedicine(); break; case 3: deleteMedicine(); break; case 4: searchMedicine(); break; case 5: sortMedicines(); break; case 6: billing(); break; case 7: salesReport(); break; case 8: checkLowStock(); break; case 9: checkExpiry(); break; case 10: changePassword(currentUser); break; case 11: backup(); break; case 12: restore(); break; case 13: logout(); exit(0); default: printf("Invalid choice.\n"); } } else if (isStaff()) { switch (choice) { case 1: searchMedicine(); break; case 2: sortMedicines(); break; case 3: billing(); break; case 4: checkLowStock(); break; case 5: changePassword(currentUser); break; case 6: logout(); exit(0); default: printf("Invalid choice.\n"); } } } return 0; } **# Explanation** backup() → Creates backup of medicines & sales. restore() → Restores data from backup. main(): Starts with login. Admin has full menu (CRUD + Billing + Reports + Backup). Staff has limited menu. Uses infinite loop until Billing & Sales Report // ---- Function Declarations ---- Explanationid billing() { billing() → Handles medicine sale, updates stock, records sale. salesReport() → Displays history of all sales. void billing(); void salesReport(); // ---- Implementations ---- vo FILE *fp = fopen("medicines.txt", "r"); FILE *temp = fopen("temp_medicines.txt", "w"); FILE *sales = fopen("sales.txt", "a"); struct Medicine med; struct SaleLog s; int id, qty, found = 0; char line[256]; time_t t = time(NULL); struct tm tm = *localtime(&t); if (!fp || !temp || !sales) { printf("Error opening file(s).\n"); if (fp) fclose(fp); if (temp) fclose(temp); if (sales) fclose(sales); return; } getInput("Customer Name: ", s.customer, sizeof(s.customer)); printf("Medicine ID for sell: "); while (scanf("%d", &id) != 1) { printf("Enter valid number!\n"); clearInputBuffer(); } clearInputBuffer(); printf("Quantity: "); while (scanf("%d", &qty) != 1) { printf("Enter valid number!\n"); clearInputBuffer(); } clearInputBuffer(); while (fgets(line, sizeof(line), fp)) { int res = sscanf(line, "%d|%49[^|]|%49[^|]|%f|%29[^|]|%d|%14[^\n]", &med.id, med.name, med.company, &med.price, med.category, &med.quantity, med.expiry); if (res != 7) { fputs(line, temp); continue; } if (med.id == id) { found = 1; if (med.quantity >= qty) { med.quantity -= qty; s.quantity = qty; strcpy(s.medicine, med.name); s.total = med.price * qty; sprintf(s.date, "%02d-%02d-%04d", tm.tm_mday, tm.tm_mon + 1, tm.tm_year + 1900); fprintf(sales, "%s|%s|%d|%.2f|%s\n", s.customer, s.medicine, s.quantity, s.total, s.date); printf("Bill: %.2f\n", s.total); } else { printf("Not enough stock!\n"); } } fprintf(temp, "%d|%s|%s|%.2f|%s|%d|%s\n", med.id, med.name, med.company, med.price, med.category, med.quantity, med.expiry); } fclose(fp); fclose(temp); fclose(sales); if (!found) { printf("Medicine Not Found!\n"); remove("temp_medicines.txt"); } else { remove("medicines.txt"); rename("temp_medicines.txt", "medicines.txt"); } } void salesReport() { FILE *fp = fopen("sales.txt", "r"); if (!fp) { printf("Error opening sales file.\n"); return; } printf("\n --- Sales Report ---\n"); char line[256]; struct SaleLog s; while (fgets(line, sizeof(line), fp)) { int ok = sscanf(line, "%49[^|]|%49[^|]|%d|%f|%19[^\n]", s.customer, s.medicine, &s.quantity, &s.total, s.date); if (ok == 5) { printf("Customer: %s | Medicine: %s | Qty: %d | Total: %.2f | Date: %s\n", s.customer, s.medicine, s.quantity, s.total, s.date); } } fclose(fp); } **USER MANUAL** USER interface ![UPDATE INTERFACE.jpg](https://files.peakd.com/file/peakd-hive/brain-less/23t6zyWeMjLmUB4HijbYK5vxvrBMMDUMzrVMDMN849SdZydpnZ3mKhmyPCL2XQ9agwkFj.jpg) Amin Login ![Admin login interface.jpg](https://files.peakd.com/file/peakd-hive/brain-less/23tRqtT419GxSqHWYYQTx5SCGZXK9ToAE4WFas8c3r6hV87pCgCet1iqyFTZiJtmpYo1t.jpg) Normal Login interface ![LOG IN INTERFACE.jpg](https://files.peakd.com/file/peakd-hive/brain-less/23t72p7N6HD5H2Zx9oCmtiU1pcwvPL7QYQtxeHxzkeZByy5F33Tqrm5Daxc1MpSTspcmA.jpg) Add Medicine ![ADD MEDICINE INTERFACE.jpg](https://files.peakd.com/file/peakd-hive/brain-less/23tRrM3Jz9b51nYWvWtPhdbxBRJorziXzHEZZBhuE1tg3B5YxiiMTsVJQ9GZp4gYonmRG.jpg) Delete Medicine ![DELETE MEDICINE.jpg](https://files.peakd.com/file/peakd-hive/brain-less/Eo43uknVPWgfWXYmJamR2eseuSp7Q57z1XU2AuhSMXfo947xorzwbe28QkkR4DU9iQG.jpg) Update Medicine ![UPDAE MEDICINE.jpg](https://files.peakd.com/file/peakd-hive/brain-less/23tRqtT419GxXVhkVBJ2NmcWk2Ckv21H6212J72xMd4ZLELfrQwWcSWsULzLUkPRh9o5M.jpg) Expiary info ![EXPIARY INFO.jpg](https://files.peakd.com/file/peakd-hive/brain-less/Eo44GP1J78jdsCe8weNgmDtzyx4cAMCc1Zn2zmz8M2MGLsG5931ckkkkSjaX7MMtAT4.jpg) stock CK ![STOCK CHECKING.jpg](https://files.peakd.com/file/peakd-hive/brain-less/23tGTE6aisaFeXquhrEc8rYcY2NKf9hYJE2Vbn2JxFWmyrGvJijUgXSQMTqfNqSqwhHZ7.jpg) Billing info ![BILLING INFO .jpg](https://files.peakd.com/file/peakd-hive/brain-less/23tbEYpdWuUCkAei1uruVxDvkamJTLArb1FYuUHyXa5Z2AdQZZGDaxxzbPFiM77NQLS99.jpg) ***THANKS *** [//]:# (!worldmappin 22.795399 lat 89.549959 long A short project over C d3scr)