Struct Design for Contact Managemant

A contact management system requires two main data structures: one for individual contacts and another for the contact list itself.

Contact Structure Definition

struct ContactEntry {
    string fullName;
    int genderCode;  // 1 for male, 2 for female
    int ageValue;
    string phoneNumber;
    string homeAddress;
};

Address Book Structure Definition

#define MAX_CONTACTS 100

struct ContactDirectory {
    ContactEntry entries[MAX_CONTACTS];
    int currentCount;
};

User Interface and Menu System

Menu Display Function

void displayMenu() {
    cout << "1. Add New Contact" << endl;
    cout << "2. Display All Contacts" << endl;
    cout << "3. Remove Contact" << endl;
    cout << "4. Search Contact" << endl;
    cout << "5. Update Contact" << endl;
    cout << "6. Clear All Contacts" << endl;
    cout << "0. Exit Program" << endl;
}

Main Program Loop

int main() {
    int userChoice;
    ContactDirectory directory;
    directory.currentCount = 0;
    
    while (true) {
        displayMenu();
        cin >> userChoice;
        
        switch (userChoice) {
            case 1: addContact(&directory); break;
            case 2: showContacts(&directory); break;
            case 3: removeContact(&directory); break;
            case 4: searchContact(&directory); break;
            case 5: updateContact(&directory); break;
            case 6: clearDirectory(&directory); break;
            case 0:
                cout << "Goodbye!" << endl;
                system("pause");
                return 0;
            default: break;
        }
    }
    return 0;
}

Core Function Implementations

Adding a New Contact

void addContact(ContactDirectory* dir) {
    if (dir->currentCount == MAX_CONTACTS) {
        cout << "Directory is full" << endl;
        return;
    }
    
    ContactEntry newContact;
    
    cout << "Enter full name: " << endl;
    cin >> newContact.fullName;
    
    int genderInput;
    while (true) {
        cout << "Enter gender (1=Male, 2=Female): " << endl;
        cin >> genderInput;
        if (genderInput == 1 || genderInput == 2) {
            newContact.genderCode = genderInput;
            break;
        }
        cout << "Invalid input, try again" << endl;
    }
    
    cout << "Enter age: " << endl;
    cin >> newContact.ageValue;
    
    cout << "Enter phone number: " << endl;
    cin >> newContact.phoneNumber;
    
    cout << "Enter address: " << endl;
    cin >> newContact.homeAddress;
    
    dir->entries[dir->currentCount] = newContact;
    dir->currentCount++;
    
    cout << "Contact added successfully" << endl;
    system("pause");
    system("cls");
}

Displaying All Contacts

void showContacts(ContactDirectory* dir) {
    if (dir->currentCount == 0) {
        cout << "No contacts available" << endl;
        return;
    }
    
    for (int i = 0; i < dir->currentCount; i++) {
        cout << "Name: " << dir->entries[i].fullName << "\t";
        cout << "Gender: " << (dir->entries[i].genderCode == 1 ? "Male" : "Female") << "\t";
        cout << "Age: " << dir->entries[i].ageValue << "\t";
        cout << "Phone: " << dir->entries[i].phoneNumber << "\t";
        cout << "Address: " << dir->entries[i].homeAddress << endl;
    }
    
    system("pause");
    system("cls");
}

Contact Search Utility

int findContactIndex(ContactDirectory* dir, string targetName) {
    if (dir->currentCount == 0) {
        cout << "Directory is empty" << endl;
        return -1;
    }
    
    for (int i = 0; i < dir->currentCount; i++) {
        if (dir->entries[i].fullName == targetName) {
            return i;
        }
    }
    return -1;
}

Removing a Contact

void removeContact(ContactDirectory* dir) {
    string targetName;
    cout << "Enter name to remove: " << endl;
    cin >> targetName;
    
    int index = findContactIndex(dir, targetName);
    if (index == -1) {
        cout << "Contact not found" << endl;
        return;
    }
    
    for (int i = index; i < dir->currentCount - 1; i++) {
        dir->entries[i] = dir->entries[i + 1];
    }
    
    dir->currentCount--;
    cout << "Contact removed successfully" << endl;
    system("pause");
    system("cls");
}

Searching for a Contact

void searchContact(ContactDirectory* dir) {
    string targetName;
    cout << "Enter name to search: " << endl;
    cin >> targetName;
    
    int index = findContactIndex(dir, targetName);
    if (index == -1) {
        cout << "Contact not found" << endl;
        return;
    }
    
    cout << "Name: " << dir->entries[index].fullName << "\t";
    cout << "Gender: " << (dir->entries[index].genderCode == 1 ? "Male" : "Female") << "\t";
    cout << "Age: " << dir->entries[index].ageValue << "\t";
    cout << "Phone: " << dir->entries[index].phoneNumber << "\t";
    cout << "Address: " << dir->entries[index].homeAddress << endl;
    
    system("pause");
    system("cls");
}

Upadting Contact Information

void updateContact(ContactDirectory* dir) {
    string targetName;
    cout << "Enter name to update: " << endl;
    cin >> targetName;
    
    int index = findContactIndex(dir, targetName);
    if (index == -1) {
        cout << "Contact not found" << endl;
        return;
    }
    
    cout << "Enter new name: " << endl;
    cin >> dir->entries[index].fullName;
    
    int genderInput;
    while (true) {
        cout << "Enter new gender (1=Male, 2=Female): " << endl;
        cin >> genderInput;
        if (genderInput == 1 || genderInput == 2) {
            dir->entries[index].genderCode = genderInput;
            break;
        }
        cout << "Invalid input, try again" << endl;
    }
    
    cout << "Enter new age: " << endl;
    cin >> dir->entries[index].ageValue;
    
    cout << "Enter new phone: " << endl;
    cin >> dir->entries[index].phoneNumber;
    
    cout << "Enter new address: " << endl;
    cin >> dir->entries[index].homeAddress;
    
    cout << "Contact updated successfully" << endl;
    system("pause");
    system("cls");
}

Clearing All Contacts

void clearDirectory(ContactDirectory* dir) {
    dir->currentCount = 0;
    cout << "All contacts cleared" << endl;
    system("pause");
    system("cls");
}