contact_book.h

/**
 * Name:Vivek Kumar Singh
 * Email:singhvivek02099@gmail.com
 */
/*This is neive approach in which multiple vectors are used to perform the contact book*/
#include <vector>
#include <string>
#include <iostream>
using namespace std;
class contact
{
public:
    string first_name;
    string last_name;
    string phone_no;
    contact(string fname, string lname, string phone)
    {
        this->first_name = fname;
        this->last_name = lname;
        this->phone_no = phone;
    }
};
class contact_book
{
    vector<contact> contact_list;

public:
    bool add(string, string, string);
    vector<contact> pre_search(string, int);   // for partial search
    vector<contact> exact_search(string, int); // for exact search
};
bool contact_book::add(string fname, string lname, string phone)
{
    contact c(fname, lname, phone);
    if (phone[0] != '+' || phone.size() < 12 || phone.size() > 13)
    {
        return false;
    }
    for (int i = 1; i < phone.size(); i++)
    {
        if (phone[i] > '9' || phone[i] < '0')
        {
            return false;
        }
    }
    contact_list.push_back(c);
    return 1;
}
vector<contact> contact_book::exact_search(string s, int type)
{
    vector<contact> ans;
    // type:1:-first name search
    // type:2:-last name search
    // type:3-phone number search
    transform(s.begin(), s.end(), s.begin(), ::tolower);
    int n = contact_list.size();
    for (int i = 0; i < n; i++)
    {
        contact curr = contact_list[i];
        transform(curr.first_name.begin(), curr.first_name.end(), curr.first_name.begin(), ::tolower);
        transform(curr.last_name.begin(), curr.last_name.end(), curr.last_name.begin(), ::tolower);
        if (type == 1 && curr.first_name == s || type == 2 && curr.last_name == s || type == 3 && curr.phone_no == s)
        {
            ans.push_back(curr);
        }
    }
    return ans;
}
bool compare_string(string given, string required)
{
    transform(given.begin(), given.end(), given.begin(), ::tolower);
    transform(required.begin(), required.end(), required.begin(), ::tolower);
    if (required.size() > given.size())
        return false;
    for (int i = 0; i < required.size(); i++)
    {
        if (given[i] != required[i])
            return false;
    }
    return true;
}
vector<contact> contact_book::pre_search(string s, int type)
{
    // type:1:-first name search
    // type:2:-last name search
    // type:3-phone number search
    vector<contact> ans;
    int n = contact_list.size();
    for (int i = 0; i < n; i++)
    {
        contact curr = contact_list[i];
        transform(curr.first_name.begin(), curr.first_name.end(), curr.first_name.begin(), ::tolower);
        transform(curr.last_name.begin(), curr.last_name.end(), curr.last_name.begin(), ::tolower);
        if (type == 1 && compare_string(curr.first_name, s) || type == 2 && compare_string(curr.last_name, s) || type == 3 && compare_string(curr.phone_no, s))
            ans.push_back(curr);
    }
    return ans;
}
/**
 * Name:Vivek Kumar Singh
 * Email:singhvivek02099@gmail.com
 */