Solution

/*

Programmer: Jennifer Leopold

Date: February 1, 2018

File: hw3.cpp

Purpose: Get user input for opening 3 locks to gain

access to cookies locked up in a jar.

To compile: fg++ hw3.cpp -o hw3

To execute: ./hw3

*/

#include <iostream>

#include <cmath>

using namespace std;

// Secret value for opening lock #1

const int LOCK1_SECRET_VALUE = 15;

// Maximum # attempts user can try to open lock #1

const int LOCK1_MAX_ATTEMPTS = 2;

// Secret values for opening lock #2

const float LOCK2_SECRET_DISTANCE_VALUE = 17.45;

const float LOCK2_SECRET_TOLERANCE_VALUE = 0.1;

// Secret values for opening lock #3

const float LOCK3_SECRET_MAGIC_RATIO = 3.4;

const int LOCK3_SECRET_PASSWORD_LENGTH = 1;

int main()

{

int passCode; // user inputs

float sliderAmt;

string password;

string userName;

char yesNo;

bool open1, open2, open3; // whether lock 1..3 is open

int numTries; // # attempts at opening a lock

// Greeting

cout << "Welcome to BoJack's Cookie Jar Security "

<< "System!\n\n";

// Get user's name

cout << "Enter your name (with no spaces): ";

cin >> userName;

// Let the user try to open the locks

do

{

// Initially, all locks are not open

open1 = false;

open2 = false;

open3 = false;

// Let user try to open 1st lock

numTries = 1;

do

{

cout << "\nEnter a 5-digit passcode for lock #1: ";

cin >> passCode;

// Check that the product of 10's digit and 1000's digit

// is a particular value

open1 = (((passCode / 10) % 10) *

((passCode / 1000) % 10)) == LOCK1_SECRET_VALUE;

if (!open1)

{

cout << "That is the incorrect code for lock #1!";

if (numTries < LOCK1_MAX_ATTEMPTS)

cout << " You get another try.\n";

else cout << "\nYou don't get to try this lock again"

<< " or go on to the next lock!\n";

}

numTries++;

} while ((!open1) && (numTries <= LOCK1_MAX_ATTEMPTS));

// If 1st lock opened, let user try to open next locks

if (open1)

{

cout << "\nEnter amount to move the lock #2 slider: ";

cin >> sliderAmt;

// Check that the amount entered is within a particular

// tolerance

open2 = fabs(LOCK2_SECRET_DISTANCE_VALUE - sliderAmt) <=

LOCK2_SECRET_TOLERANCE_VALUE;

if (!open2)

cout << "That does not open lock #2!\n"

<< "You don't get to try this lock again"

<< " or go on to the next lock!\n";

else

{

// Let user try to open 3rd lock

cout << "\nEnter a password (with no spaces) for "

<< "lock #3: ";

cin >> password;

// Check that the integer part of the lock #2 distance

// divided by the password length is a certain value,

// or that the length of the password is 1

open3 = ((static_cast<int>(LOCK2_SECRET_DISTANCE_VALUE)

/ static_cast<float>(password.length())) ==

LOCK3_SECRET_MAGIC_RATIO)

||

(password.length() ==

LOCK3_SECRET_PASSWORD_LENGTH);

if (!open3)

cout << "That does not open lock #3!"

<< " You don't get to try this lock again!\n";

else cout << "\nCongratulations, " << userName << "! "

<< "You can get into BoJack's cookies!\n";

}

}

// If user didn't open the cookie jar, see if they

// want to start over

if (!open3)

{

cout << "\nDo you want to start all over again? (y/n) ";

cin >> yesNo;

}

else yesNo = 'N';

} while ((yesNo == 'y') || (yesNo == 'Y'));

// Sign-off

cout << "\nGoodbye, " << userName << "!\n";

return 0;

}