Untitled

Here are the modifications needed to add the `SEARCHBYCITY` functionality and rename the existing search function to `searchByID`. I'll create a new file for the `searchByCity` function and make necessary changes in other files as well.

### 1. Update the `Employee` Structure in `employee.h`

First, we'll add the `Address` structure inside the `Employee` structure to hold address details.

```c
//employee.h

#ifndef EMPLOYEE_H
#define EMPLOYEE_H

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

struct Address {
    char houseno[100];
    char street[100];
    char city[100];
    int pincode;
};

struct Employee {
    int empid;
    char *empname;      // Pointer for employee name
    int esalary;
    char *designation;  // Pointer for designation
    struct Address address; // Address structure
};

// Declare the employeeCount variable as extern
extern int employeeCount;

void collectEmployeeInfo(struct Employee *emp);
void searchByID(int empid);
void searchByCity(const char *city);
void modifyEmployee(int empid);
void deleteEmployee(int empid);
void displayAllEmployees();
void saveToFile(struct Employee *emp);

#endif
```

### 2. Modify `collect.c` to Collect Address Information

Update `collectEmployeeInfo` to include input for the address fields.

```c
//collect.c

#include "employee.h"
#include <string.h>
#include <ctype.h>

// Existing validation functions remain unchanged...

void collectEmployeeInfo(struct Employee *emp) {
    emp->empname = malloc(100 * sizeof(char));
    emp->designation = malloc(100 * sizeof(char));

    if (emp->empname == NULL || emp->designation == NULL) {
        printf("Memory allocation failed.\n");
        exit(1);
    }

    // Collect Employee ID, Name, Salary, and Designation...
    
    // Collect Address Information
    printf("Enter House Number: ");
    fgets(emp->address.houseno, sizeof(emp->address.houseno), stdin);
    emp->address.houseno[strcspn(emp->address.houseno, "\n")] = '\0'; // Remove newline

    printf("Enter Street: ");
    fgets(emp->address.street, sizeof(emp->address.street), stdin);
    emp->address.street[strcspn(emp->address.street, "\n")] = '\0'; // Remove newline

    printf("Enter City: ");
    fgets(emp->address.city, sizeof(emp->address.city), stdin);
    emp->address.city[strcspn(emp->address.city, "\n")] = '\0'; // Remove newline

    printf("Enter Pincode: ");
    emp->address.pincode = validateIntegerInput(); // Validate and collect Pincode
    employeeCount++; // Increment the employee count when a new record is collected
}
```

### 3. Rename `searchEmployee` to `searchByID` and Create `searchByCity` Function

Create a new file `searchByCity.c` and modify the existing search function in `search.c`.

```c
//search.c

#include <stdio.h>
#include <stdlib.h>
#include "employee.h"

// Function to search for an employee by ID
void searchByID(int empid) {
    FILE *file = fopen("employees.txt", "r");
    if (file == NULL) {
        printf("File does not exist.\n");
        return;
    }

    fseek(file, 0, SEEK_END);
    if (ftell(file) == 0) {
        printf("No records found.\n");
        fclose(file);
        return;
    }
    fseek(file, 0, SEEK_SET);

    struct Employee emp;
    emp.empname = malloc(100 * sizeof(char));
    emp.designation = malloc(100 * sizeof(char));

    if (emp.empname == NULL || emp.designation == NULL) {
        printf("Memory allocation failed.\n");
        fclose(file);
        return;
    }

    int found = 0;

    while (fscanf(file, "%d,%99[^,],%d,%99[^,],%99[^,],%99[^,],%d\n",
                  &emp.empid, emp.empname, &emp.esalary, emp.designation,
                  emp.address.houseno, emp.address.street, &emp.address.pincode) == 7) {
        if (emp.empid == empid) {
            printf("Employee ID: %d\n", emp.empid);
            printf("Employee Name: %s\n", emp.empname);
            printf("Employee Salary: %d\n", emp.esalary);
            printf("Designation: %s\n", emp.designation);
            printf("Address: %s, %s, %s, %d\n", emp.address.houseno, emp.address.street, emp.address.city, emp.address.pincode);
            found = 1; // Set found flag
            break; // Exit loop if employee is found
        }
    }

    if (!found) {
        printf("Employee with ID %d not found.\n", empid);
    }

    free(emp.empname);
    free(emp.designation);
    fclose(file);
}
```

### 4. Implement `searchByCity` in `searchByCity.c`

Create a new file `searchByCity.c` for searching employees by city.

```c
//searchByCity.c

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

// Function to search for employees by city
void searchByCity(const char *city) {
    FILE *file = fopen("employees.txt", "r");
    if (file == NULL) {
        printf("File does not exist.\n");
        return;
    }

    fseek(file, 0, SEEK_END);
    if (ftell(file) == 0) {
        printf("No records found.\n");
        fclose(file);
        return;
    }
    fseek(file, 0, SEEK_SET);

    struct Employee emp;
    emp.empname = malloc(100 * sizeof(char));
    emp.designation = malloc(100 * sizeof(char));

    if (emp.empname == NULL || emp.designation == NULL) {
        printf("Memory allocation failed.\n");
        fclose(file);
        return;
    }

    int found = 0;

    while (fscanf(file, "%d,%99[^,],%d,%99[^,],%99[^,],%99[^,],%d\n",
                  &emp.empid, emp.empname, &emp.esalary, emp.designation,
                  emp.address.houseno, emp.address.street, &emp.address.pincode) == 7) {
        if (strcmp(emp.address.city, city) == 0) {
            printf("Employee ID: %d\n", emp.empid);
            printf("Employee Name: %s\n", emp.empname);
            printf("Employee Salary: %d\n", emp.esalary);
            printf("Designation: %s\n", emp.designation);
            printf("Address: %s, %s, %s, %d\n", emp.address.houseno, emp.address.street, emp.address.city, emp.address.pincode);
            found = 1; // Set found flag
        }
    }

    if (!found) {
        printf("No employees found in city: %s\n", city);
    }

    free(emp.empname);
    free(emp.designation);
    fclose(file);
}
```

### 5. Update the Main Menu in `main.c`

Add an option to search by city in the main menu.

```c
//main.c

#include <stdio.h>
#include <stdlib.h>
#include "employee.h"

// Define the employeeCount variable here
int employeeCount = 0;

// Function to initialize employeeCount from the file
void initializeEmployeeCount() {
    FILE *file = fopen("employees.txt", "rb");
    if (file == NULL) {
        employeeCount = 0;
        return;
    }

    struct Employee emp;
    while (fread(&emp, sizeof(struct Employee), 1, file) == 1) {
        employeeCount++;
    }
    fclose(file);
}

int main() {
    initializeEmployeeCount(); // Initialize employeeCount at the start

    int choice;
    struct Employee emp;
    while (1) {
        printf("\n1. Collect Employee Info\n2. Search Employee by ID\n3. Search Employee by City\n4. Modify Employee\n5. Delete Employee\n6. Display All Employees\n7. Exit\n");
        printf("Enter your choice: ");
        scanf("%d", &choice);
        getchar(); // Clear the newline from input buffer

        switch (choice) {
            case 1:
                collectEmployeeInfo(&emp);
                saveToFile(&emp); // Save employee data to the file
                break;
            case 2: {
                int searchId;
                printf("Enter Employee ID to search: ");
                scanf("%d", &searchId);
                searchByID(searchId);
                break;
            }
            case 3: {
                char city[100];
                printf("Enter city to search: ");
                fgets(city, sizeof(city), stdin);
                city[strcspn(city, "\n")] = '\0'; // Remove newline
                searchByCity(city);
                break;
            }
            case 4:
                // Modify Employee code remains unchanged...
                break;
            case 5:
                // Delete Employee code remains unchanged...
                break;
            case 6:
                displayAllEmployees();
                break;
            case 7:
                exit(0);
            default:
                printf("Invalid choice. Please try again.\n");
        }
    }
    return 0;
}
```

### Summary of Changes
1. Updated the `