我在完成家庭作业时遇到了麻烦。我在程序上的所有功能都非常有用，但for循环增加了升级的价值。
作业如下：
从用户选择汽车后，一些引擎升级。这些升级可以从0（无升级）到5最大升级。你也需要一个很好的循环。
每级升级100美元加上升级费用降低
示例：1级升级为100美元 示例：2级升级为100美元+ 200美元= 300美元 示例：3级升级为100美元+ 200美元+ 300美元= 600美元 等等等等等等等等等等等等......
这是我到目前为止的代码：
#include <iostream>
#include <iomanip>
int main () {
int quoteNum = 0;
int carChoice = 0;
double carCost = 0;
double upgradeCost = 0;
int upgradeChoice = 0;
int engineLevel = 0;
double totalCost = 0;
std::cout << std::fixed << std::showpoint << std::setprecision(2);
do {
std::cout << "Welcome to Bob's used car lot and chop shop!\n";
std::cout << "As you can see we have quite a few to choose from!\n";
std::cout << "Which one would you like?: \n";
std::cout << "[1] 2005 Volkswagen Beetle ($8,000)\n";
std::cout << "[2] 2008 Pontiac G6 ($8,581)\n";
std::cout << "[3] 2004 Chevy S-10 ($10,500)\n";
std::cout << "[4] 2016 Jeep Patriot ($15,209)\n";
std::cout << "[5] 2012 Jeep Wrangler Sport ($24,390)\n";
std::cin >> carChoice;
} while (carChoice <= 0 || carChoice > 5);
switch (carChoice) {
case 1:
carCost = 8000.00;
break;
case 2:
carCost = 8581.00;
break;
case 3:
carCost = 10500.00;
break;
case 4:
carCost = 15209.00;
break;
case 5:
carCost = 24390.00;
break;
}
do {
std::cout << "Quote:{" << quoteNum++ << "} ";
std::cout << " Car($" << carCost << ")";
std::cout << " E(" << engineLevel << ")";
std::cout << " Upgrades($" << upgradeCost << ")" << std::endl;
std::cout << "Do you want to upgrade your car?\n";
std::cout << "[-/+1] Downgrade / Upgrade Engine\n";
std::cout << "[ 2] Clear all upgrades\n";
std::cout << "[ 3] Reset car\n";
std::cout << "[ 4] Buy Car!!!\n";
std::cout << "What would you like to do?: \n";
std::cin >> upgradeChoice;
if (upgradeChoice == -1) {
engineLevel--;
upgradeCost--;
}
if (upgradeChoice == 1) {
for (upgradeCost = 0; upgradeCost <= 5; upgradeCost++) {
upgradeCost = 100.00;
}
}
if (upgradeChoice == 2) {
engineLevel = 0;
upgradeCost = 0.00;
}
if (upgradeChoice == 3) {
std::cout << "Welcome to Bob's used car lot and chop shop!\n";
std::cout << "As you can see we have quite a few to choose "
"from!\n";
std::cout << "Which one would you like?: \n";
std::cout << "[1] 2005 Volkswagen Beetle ($8,000)\n";
std::cout << "[2] 2008 Pontiac G6 ($8,581)\n";
std::cout << "[3] 2004 Chevy S-10 ($10,500)\n";
std::cout << "[4] 2016 Jeep Patriot ($15,209)\n";
std::cout << "[5] 2012 Jeep Wrangler Sport ($24,390)\n";
std::cin >> carChoice;
std::cin.ignore();
switch (carChoice) {
case 1:
carCost = 8000.00;
break;
case 2:
carCost = 8581.00;
break;
case 3:
carCost = 10500.00;
break;
case 4:
carCost = 15209.00;
break;
case 5:
carCost = 24390.00;
break;
}
}
if (upgradeChoice == 4) {
totalCost = carCost + upgradeCost;
std::cout << "Bill: Car($" << carCost << ")";
std::cout << " Upgrades($" << upgradeCost << ")";
std::cout << " Total ($" << totalCost << ")\n";
std::cout << "Press ENTER to continue";
std::cin.ignore();
std::cin.get();
return 0;
}
} while (upgradeChoice >= -1 || upgradeChoice <= 4 && upgradeChoice != 0);
}
你们有什么建议吗？
答案 0 :(得分：1)
我使用类解决了这个任务，我建议你开始学习面向对象的编程，因为它是编程的一个非常重要的部分，即使你没有在学校开始学习它。它使您的开发更容易透视。
对于这个项目，我使用C ++ 11和GNU C / C ++编译器。
虽然它可能包含错误或传统错误，但抱歉！
包含的标题：
#include <iostream>
#include <string>
#include <vector>
#include <sstream> // std::stringstream
<强>助手：
using USHORT = unsigned short;
template <typename T>
std::string convert_string(const T value) {
std::stringstream stream;
stream << value;
return stream.str();
}
// note: use std::to_string instead of convert_string, if your compiler supports it
代表经销商汽车的汽车类：
class Car {
USHORT year, engine_level;
std::string name;
float price, upgrade_cost;
public:
Car(USHORT year, std::string name, float price) {
this->year = year;
this->name = name;
this->price = price;
engine_level = 1;
upgrade_cost = 0.0;
}
std::string to_string() { return convert_string(year) + " " + name + " " + " ($" + convert_string(price) + ")"; }
friend std::ostream& operator<<(std::ostream& os, Car car) {
os << car.to_string() << std::endl;
return os;
}
std::string get_engine_level() { return "E(" + convert_string(engine_level) + ")"; }
std::string get_price() { return "Car($" + convert_string(price) + ")"; }
std::string get_upgrade_cost() { return "Upgrades($" + convert_string(upgrade_cost) + ")"; }
void downgrade() {
if(engine_level > 1) {
engine_level--;
upgrade_cost -= (100 + (engine_level * 100));
} else {
std::cout << "You can't downgrade your car from level 1!" << std::endl;
}
}
void upgrade() {
engine_level++;
upgrade_cost += (100 + (engine_level * 100));
}
void clear_upgrades() { engine_level = 1; upgrade_cost = 0.0; }
std::string get_total_cost() { return "Total ($" + convert_string(price + upgrade_cost) + ")"; }
};
代表经销商和研讨会的班级：
class CarDealerAndWorkshop {
std::vector<Car> cars_for_sale;
public:
CarDealerAndWorkshop(std::vector<Car> cars_for_sale) { this->cars_for_sale = cars_for_sale; }
void welcome_message() {
std::cout <<
"Welcome to Bob's used car lot and chop shop!\n"
"As you can see we have quite a few to choose from!\n"
"Which one would you like?: ";
}
void upgrade_message() {
std::cout <<
"Do you want to upgrade your car?\n"
"[-/+1] Downgrade / Upgrade Engine\n"
"[ 2] Clear all upgrades\n"
"[ 3] Reset car\n"
"[ 4] Buy Car!!!\n"
"What would you like to do?: ";
}
void show_cars() {
int counter = 1;
for (auto car : cars_for_sale) {
std::cout << "[" << counter++ << "] ";
std::cout << car;
}
}
unsigned number_of_cars() { return cars_for_sale.size(); }
bool validate(const USHORT number) { return number <= number_of_cars() && number >= 0; }
Car* get_car_by_num(const USHORT num) { return &cars_for_sale[num]; }
void buy(const int number) { cars_for_sale.erase(cars_for_sale.begin() + number); }
bool are_there_cars() {
if(number_of_cars() == 0) {
std::cout << "We are very sorry, but we have ran out of cars!\n";
return false;
}
return true;
}
};
代表客户的类：
class Customer {
Car* car_choice;
std::string name;
public:
Customer(std::string name) { this->name = name; }
void set_car_choice(Car* car) { car_choice = car; }
Car* get_car_choice() { return car_choice; }
};
最后是客户端代码：
int main () {
CarDealerAndWorkshop Bobs_Dealership({
{2005, "Volkswagen Beetle", 8000},
{2008, "Pontiac G6", 8581},
{2004, "Chevy S-10", 10500},
{2016, "Jeep Patriot", 15209},
{2012, "Jeep Wrangler Sport", 24390}
});
Customer customer("Bill");
Bobs_Dealership.welcome_message();
bool is_quit_dealer = false;
while(!is_quit_dealer) {
if(!Bobs_Dealership.are_there_cars())
is_quit_dealer = true;
USHORT car_choice;
do {
Bobs_Dealership.show_cars();
std::cin >> car_choice;
} while (!Bobs_Dealership.validate(car_choice-1));
customer.set_car_choice(Bobs_Dealership.get_car_by_num(car_choice-1));
unsigned quote_num = 0;
bool is_quit_workshop = false;
short upgrade_choice;
while(!is_quit_workshop) {
std::cout << "Quote:{" << quote_num++ << "} " << std::endl;
std::cout << customer.get_car_choice()->get_price() << std::endl;
std::cout << customer.get_car_choice()->get_engine_level() << std::endl;
std::cout << customer.get_car_choice()->get_upgrade_cost() << std::endl;
Bobs_Dealership.upgrade_message();
std::cin >> upgrade_choice;
switch(upgrade_choice) {
case -1: customer.get_car_choice()->downgrade(); break;
case 1: customer.get_car_choice()->upgrade(); break;
case 2: customer.get_car_choice()->clear_upgrades(); break;
case 3: is_quit_workshop = true; break;
case 4:
std::cout << customer.get_car_choice()->get_price() << std::endl;
std::cout << customer.get_car_choice()->get_upgrade_cost() << std::endl;
std::cout << customer.get_car_choice()->get_total_cost() << std::endl;
std::cout << "Press ENTER to continue" << std::endl;
std::cin.sync();
std::cin.get();
Bobs_Dealership.buy(car_choice-1);
is_quit_workshop = true;
}
}
}
return 0;
}