linked_list.cpp File Reference

Implementation of singly linked list algorithm. More...

#include <iostream>
#include <memory>
#include <string>

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Classes
class	data_structures::linked_list::link
class	data_structures::linked_list::list

Namespaces
namespace	data_structures
	for IO operations
namespace	linked_list
	Functions for singly linked list algorithm.

Functions
bool	data_structures::linked_list::isDigit (const std::string &s)
int	main ()

Detailed Description

Implementation of singly linked list algorithm.

The linked list is a data structure used for holding a sequence of values, which can be added, removed and displayed.

Algorithm

Values can be added by iterating to the end of a list(by following the pointers) starting from the first link. Whichever link points to null is considered the last link and is pointed to the new value.

Values can be removed by also iterating through the list. When the node containing the value is found, the node pointing to the current node is made to point to the node that the current node is pointing to, and then returning the current node to heap store.

Function Documentation

isDigit()

bool data_structures::linked_list::isDigit

(

const std::string &

s

)

This function checks if the string passed consists of only digits.

Parameters

s	To be checked if s contains only integers

Returns

true if there are only digits present in the string

false if any other character is found

                                 {
    // function statements here
    for (char i : s) {
        if (!isdigit(i)) {
            return false;
        }
    }
    return true;
}

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main()

int main

(

void

)

Main function: Allows the user add and delete values from the list. Also allows user to search for and display values in the list.

Returns

0 on exit

           {
    data_structures::linked_list::list l;
    int choice = 0;
    int x = 0;
    std::string s;
    do {
        std::cout << "\n1. Insert";
        std::cout << "\n2. Delete";
        std::cout << "\n3. Search";
        std::cout << "\n4. Print";
        std::cout << "\n0. Exit";
        std::cout << "\n\nEnter you choice : ";
        std::cin >> choice;
        switch (choice) {
            case 0:
                std::cout << "\nQuitting the program...\n";
                break;
            case 1:
                std::cout << "\nEnter the element to be inserted : ";
                std::cin >> s;
 
                if (data_structures::linked_list::isDigit(s)) {
                    x = std::stoi(s);
                    l.push_back(x);
                } else {
                    std::cout << "Wrong Input!\n";
                }
                break;
            case 2:
                std::cout << "\nEnter the element to be removed : ";
                std::cin >> s;
                if (data_structures::linked_list::isDigit(s)) {
                    x = std::stoi(s);
                    l.erase(x);
                } else {
                    std::cout << "Wrong Input!\n";
                }
                break;
            case 3:
                std::cout << "\nEnter the element to be searched : ";
                std::cin >> s;
                if (data_structures::linked_list::isDigit(s)) {
                    x = std::stoi(s);
                    std::shared_ptr<data_structures::linked_list::link> found =
                        l.search(x);
                } else {
                    std::cout << "Wrong Input!\n";
                }
                break;
            case 4:
                l.display();
                std::cout << "\n";
                break;
            default:
                std::cout << "Invalid Input\n" << std::endl;
                break;
        }
    } while (choice != 0);
    return 0;
}

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