Rock Paper Scissors AI

#include <iostream>
#include <windows.h>
#include <fstream>
#include <string>

using namespace std;

int main()
{
    string answer;
    string name;
    float playerscore = 0;
    float AIscore = 0;
    int playerpick;
    int AIpick;
    cout << "Welcome to Rock Paper Scissors!" << endl;
    Sleep(2000);
    cout<< "I don't know your name yet. "<<endl;
    Sleep(1000);
    cout << "What's your name?" << endl;
    cin >> name;
    cout << "Hey, " << name << ". I'm Benjamin's AI." << endl;
    Sleep(2000);
    cout << "Do you want to play Rock Paper Scissors?" << endl << "1: Of course!" << endl << "0: Why would I want to play Rock Paper Scissors? It's a boring game." << endl;
    cin >> answer;
    if (answer == "1") {
        cout << "Great! I love Rock Paper Scissors. Let's play!" << endl;
        Sleep(2000);
        AIpick = 2;
        while (true) {
            cout << "Pick:" << endl << "1: Rock" << endl << "2: Paper" << endl << "3: Scissors" << endl << "So what'll it be?" << endl;
            cin >> playerpick;
            cout << endl;
            switch(playerpick) {
                case 1: if (AIpick == 1) {
                        cout << "Tie! We both picked Rock!";
                        playerscore += 0.5;
                        AIscore += 0.5;
                    } else if (AIpick == 2) {
                        cout << "I won that time! I picked Paper!";
                        AIscore++;
                    } else {
                        cout << "You got me! I picked Scissors!";
                        playerscore++;
                    }
                    AIpick = 2;
                    break;
                case 2: if (AIpick == 2) {
                        cout << "Tie! We both picked Paper!";
                        playerscore += 0.5;
                        AIscore += 0.5;
                    } else if (AIpick == 3) {
                        cout << "Got you! My pick was Scissors.";
                        AIscore++;
                    } else {
                        cout << "Great job! You won that round! I shouldn't have picked Rock...";
                        playerscore++;
                    }
                    AIpick = 3;
                    break;
                case 3: if (AIpick == 3) {
                        cout << "Tie! We both picked Scissors!";
                        playerscore += 0.5;
                        AIscore += 0.5;
                    } else if (AIpick == 2) {
                        cout << "Whoops! I meant to pick Rock... Oh well, you won that time! I picked Paper.";
                        playerscore++;
                    } else {
                        cout << "Better luck next time! I picked Rock!";
                        AIscore++;
                    }
                    AIpick = 1;
                    break;
                default:
                    cout << "You didn't pick a valid choice. I assume you cheated, and therefore I got that point.";
                    AIscore++;
            }
            cout << endl << "Score: " << endl << name << " " << playerscore << " - " << AIscore << " " << "Benjamin's AI" << endl;
            if (playerscore < AIscore) {
                cout << "I'm winning! You have your work cut out for you to catch up! Good luck!" << endl;
            } else if (AIscore < playerscore) {
                cout << "You're winning! Keep it up!" << endl;
            } else {
                cout << "Looks like we're tied! You could cut the tension with a butter knife!" << endl;
            }
            cout << "Want to keep playing?" << endl << "1: Yes" << endl << "0: No" << endl;
            cin >> answer;
            if (answer == "1") {
                cout << "Great!" << endl;
            } else {
                if (playerscore > AIscore) {
                    cout << "You won! Great Job!" << endl;
                    system("PAUSE");
                    break;
                } else if (AIscore > playerscore) {
                    cout << "I won! Better luck next time!" << endl;
                    system("PAUSE");
                    break;
                } else {
                    cout << "It was a tie! Better keep practicing..." << endl;
                    system("PAUSE");
                    break;
                }
            }
        }
    } else if (answer == "0") {
        cout << "Oh well... Can we still be friends?"<< endl << "1: Of course!" << endl << "0: Why would I want to be friends with a computer? No." << endl;
        cin >> answer;
        if (answer == "1") {
            cout << "Thanks! Hopefully I'll see you again sometime soon!" << endl;
            system("PAUSE");
        } else {
            cout << "You're so mean. Bye." << endl;
            system("PAUSE");
        }
    } else {
       cout << "I couldn't understand you. I assume that you don't want to play. ";
       Sleep(1000);
       cout << "Bye!" << endl;
       system("PAUSE");
    }
}