题解 | #自动售货系统#

#include <iostream>
#include <map>
#include <string>
#include <vector>
#include <sstream>
using namespace std;

int balance = 0;
class Goods {
  private:
    string name;
    int price;
    int num;

  public:
    Goods(string name, int price, int num) : name(name), price(price), num(num) {};
    void setnum(const int newnum) {
        num = newnum;
    }
    void view() {
        cout << name << " " << price << " " << num << endl;
    }
    bool isNull() {
        if (num == 0)return true;
        else return false;
    }
    int showprice() {
        return price;
    }
};

void init(const string& str, Goods* good, map<int, int>& money) {
    string token, s;
    vector<string>tokens;
    istringstream tokenStream(str);
    int i = 0;
    while (getline(tokenStream, token, ' ')) {
        istringstream ss(token);
        while (getline(ss, s, '-')) {
            int k = stoi(s);
            if (i <= 5)good[i].setnum(k);
            else if (i == 6)money[1] = k;
            else if (i == 7)money[2] = k;
            else if (i == 8)money[5] = k;
            else if (i == 9)money[10] = k;
            else break;
            i++;
        }
    }
    cout << "S001:Initialization is successful" << endl;
}

void query(const string& str, Goods* good, map<int, int>& money) {
    if (str[0] == '0') {
        for (int i = 0; i < 6; i++) {
            good[i].view();
        }
    }
    if (str[0] == '1') {
        for (const auto& pair : money) {
            cout  << pair.first << "yuan coin number= " << pair.second << endl;
        }
    }
    else cout<<"E010:Parameter error"<<endl;
}

void change(Goods* good, map<int, int>& money) {
    int one = 0, two = 0, five = 0, ten = 0;
    if (balance == 0)cout << "E009:Work failure" << endl;
    else {
        while (balance) {
            if (balance >= 10 && money[10]) {
                ten++;
                money[10]--;
                balance -= 10;
            } else if (balance >= 5 && money[5]) {
                five++;
                money[5]--;
                balance -= 5;
            } else if (balance >= 2 && money[2]) {
                two++;
                money[2]--;
                balance -= 2;
            } else if (balance >= 1 && money[1]) {
                one++;
                money[1]--;
                balance -= 1;
            } else break;
        }
        cout << "1 yuan coin number=" << one << endl;
        cout << "2 yuan coin number=" << two << endl;
        cout << "5 yuan coin number=" << five << endl;
        cout << "10 yuan coin number=" << ten << endl;
    }
}

void pay(const string& str, Goods* good, map<int, int>& money) {
    int k = stoi(str);
    if (k != 5 && k != 1 && k != 2 && k != 10) {
        cout << "E002:Denomination error" << endl;
        return;
    }
    if (k == 5 || k == 10) {
        if (money[1] + money[2] * 2 < k) {
            cout << "E003:Change is not enough, pay fail" << endl;
            return;
        }
    }
    if (good[0].isNull() && good[1].isNull() && good[2].isNull() &&
            good[3].isNull() && good[4].isNull() && good[5].isNull()) {
        cout << "E005:All the goods sold out" << endl;
        return;
    }
    money[k]++;
    balance += k;
    cout << "S002:Pay success,balance=" << balance << endl;
}

void buy(const string& str, Goods* good, map<int, int>& money) {
    int k = stoi(string(1, str[1]));
    if (str != "A1" && str != "A2" && str != "A3" && str != "A4" && str != "A5" &&
            str != "A6")cout << "E006:Goods does not exist" << endl;
    else if (good[k - 1].isNull())cout << "E007:The goods sold out" << endl;
    else if (balance < good[k - 1].showprice())cout << "E008:Lack of balance" <<
                endl;
    else {
        balance -= good[k - 1].showprice();
        cout << "S003:Buy success,balance=" << balance << endl;
    }
}

int main() {
    string str;
    map<int, int>money;
    Goods good[6] = {
        Goods("A1", 2, 0),
        Goods("A2", 3, 0),
        Goods("A3", 4, 0),
        Goods("A4", 5, 0),
        Goods("A5", 8, 0),
        Goods("A6", 6, 0)
    };
    money = {
        {1, 0},
        {2, 0},
        {5, 0},
        {10, 0}
    };
    while (getline(cin, str, ';')) {
        if (str[0] == 'r')init(str.substr(2), good, money);
        if (str[0] == 'q')query(str.substr(2), good, money);
        if (str[0] == 'c')change(good, money);
        if (str[0] == 'b')buy(str.substr(2), good, money);
        if (str[0] == 'p')pay(str.substr(2), good, money);
    }
}