C++ AI Chatbot with NLP – Build a Smart Chatbot Using C++ (Full Code + Step-by-Step Guide)

Demo :

Click Video 👇👇👇

📂 Folder Structure

C++_AI_Chatbot/

│── chatbot.cpp            # Main chatbot source code

│── nlp.h                  # Header file for NLP functions

│── nlp.cpp                # NLP function implementations

│── data.txt               # Training data (questions and answers)

│── assets/                # (Optional) Icons, images, or additional assets

│── README.md              # Project documentation

│── Makefile               # (Optional) To compile the project using `make`

└── bin/                   # (Optional) Compiled binary files

Code :

1️⃣ chatbot.cpp (Main Chatbot Code)

#include <iostream>

#include <fstream>

#include <vector>

#include <string>

#include <windows.h>  // For system calls and text styling

using namespace std;

// Function prototype for NLP processing

string processNLP(const string& input, const vector<pair<string, string>>& knowledgeBase);

// Function to load training data

vector<pair<string, string>> loadTrainingData(string filename) {

    vector<pair<string, string>> data;

    ifstream file(filename);

    string question, answer;

    while (getline(file, question) && getline(file, answer)) {

        data.push_back({question, answer});

    }

    

    file.close();

    return data;

}

// Function to set console color

void setColor(int color) {

    SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), color);

}

// Function to create a stylish border

void drawBorder() {

    setColor(11); // Light Blue

    cout << "\n=====================================\n";

    setColor(14); // Yellow

    cout << "        🤖 AI Chatbot v2.0          \n";

    setColor(11);

    cout << "=====================================\n";

    setColor(15); // Reset to white

}

// Main chatbot function with a modern UI

void chatbot() {

    vector<pair<string, string>> knowledgeBase = loadTrainingData("data.txt");

    string userInput;

    system("cls");  // Clear screen

    drawBorder();

    setColor(10); // Green

    cout << "🤖 AI Chatbot: Hello! Ask me anything (type 'exit' to quit)!\n";

    setColor(15);

    while (true) {

        setColor(9); // Blue

        cout << "\nYou: ";

        setColor(15);

        getline(cin, userInput);

        

        if (userInput == "exit") {

            setColor(12); // Red

            cout << "🤖 AI Chatbot: Goodbye! Have a great day! 👋\n";

            setColor(15);

            break;

        }

        // Process NLP and get response

        string response = processNLP(userInput, knowledgeBase);

        // Display chatbot response with animation effect

        setColor(10); // Green

        cout << "🤖 AI Chatbot: ";

        for (char c : response) {

            cout << c;

            Sleep(30); // Typing effect delay

        }

        cout << endl;

        setColor(15);

    }

}

// Simple NLP Function to find a response

string processNLP(const string& input, const vector<pair<string, string>>& knowledgeBase) {

    for (const auto& pair : knowledgeBase) {

        if (input == pair.first) {

            return pair.second;

        }

    }

    return "I'm still learning! Can you ask something else?";

}

// Main Function

int main() {

    chatbot();

    return 0;

}

2️⃣ nlp.h (Header File)

#ifndef NLP_H

#define NLP_H

#include <string>

#include <vector>

std::string processNLP(const std::string& input, const std::vector<std::pair<std::string, std::string>>& data);

#endif

3️⃣ nlp.cpp (NLP Implementation)

#include "nlp.h"

#include <algorithm>

#include <iostream>

using namespace std;

// Function to process NLP and find the best response

string processNLP(const string& input, const vector<pair<string, string>>& data) {

    string bestMatch = "Sorry, I don't understand that. Can you rephrase?";

    for (const auto& pair : data) {

        string question = pair.first;

        string answer = pair.second;

        if (input.find(question) != string::npos) {

            return answer;

        }

    }

    

    return bestMatch;

}

4️⃣ data.txt (Training Data)

Hello

Hi there! How can I help you? 😊

How are you?

I'm just a chatbot, but I'm always here to help! 😃

What is your name?

I am Fuzzu AI Chatbot, your virtual assistant! 🤖

Tell me a joke

Why don’t skeletons fight each other? They don’t have the guts! 😂

exit

Goodbye! Have a great day! 👋

 

💻 How to Compile and Run

1. Open CMD in your project folder.
2. Compile the code using: cmd = > g++ chatbot.cpp nlp.cpp -o chatbot

Run the chatbot: cmd => chatbot