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#include <iostream>
#include <string>
#include <stdexcept>

std::string encrypt(std::string const& plaintext) {
    if (plaintext.length() <= 4)
        throw std::runtime_error("Invalid string length.");

    std::string first;
    std::string second;

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class PointBad {
  private:
    int x_;
  public:
    PointBad(int x) : x_(x) {}

    int GetX() {
        return this->x_;
    }
};

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class PointGood {
  private:
    int x_;
  public:
    PointGood(int x) : x_(x) {}

    int GetX() const {
        return this->x_;
    }
};

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struct PointBroken {
  private:
    int x_;
  public:
    PointBroken(int x) : x_(x) {}

    int GetX() const {
        this->x_ = 7; // Compiler error: not allowed to modify this->x_.
        return this->x_;
    }  

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struct PointAgainBroken {
  private:
    int x_;
    void SetXToSeven() {
        this->x_ = 7;
    }
  public:
    PointAgainBroken(int x) : x_(x) {}

    int GetX() const {

jesyspa

#ifndef HAND_H
#define HAND_H

// string is not IO.
#include <string>

// For random
#include <cstdlib>

class hand

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#include <memory>
#include <stack>
#include <vector>
#include <iostream>
#include <functional>

// Stores an overview of everything.  It is very easy to get this wrong;
// try to keep as few things as possible directly in this class, and as
// much as possible in more focused classes.
class World;

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// Don't forget to label as C++.
#include <iostream>

// No need to use the std namespace.

int main() {
    // Arrows in the wrong direction, and forgot a newline at the end of the string.
    std::cout << "This is used to find the slope of the line. Please enter two points.\n";
    // No need to use new here.
    float y1, y2, x1, x2; 

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#include <iostream>
#include <limits>
#include <sstream>
#include <string>
#include <vector>

int main() {
    std::cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n');

    for (std::string line; std::getline(std::cin, line);) {

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#include <iostream>
/*
 * Programming Assignment 02
 * This program will accept, from the user, the type of recreational equipment
 * being rented, as well as the duration of the rental. It will then display a
 * summary of the sale, first listing the duration of the rental, then the
 * recreational equipment being rented, and then the total cost of the rental.
 *
 * Program Preconditions
 * 1. The user will enter the type of equipment rental, which will be S for