Question

我开发了过敏程序（见下面的代码）来记录用户输入提供的过敏信息。我想为用户添加另一个选项，根据预定值输入过敏症的“严重程度”。

我想创建一个枚举来保存用户应该选择的值。这是我到目前为止所做的，但是当我谈到枚举以及它应该如何实现时，我只是无知。

Allergy.hpp：

#ifndef Allergy_hpp
#define Allergy_hpp

#include <iostream>
#include <string>
#include <list>
using namespace std;


class Allergy {
public:
    enum severity {mild, moderate, severe};

    Allergy();
    Allergy(string, string, list <string>);
    ~Allergy();

    //getters
    string getCategory() const;
    string getName() const;
    list <string> getSymptom() const;


private:

    string newCategory;
    string newName;
    list <string> newSymptom;



};

#endif /* Allergy_hpp */

Allergy.cpp：

include "Allergy.hpp"

Allergy::Allergy(string name, string category, list <string> symptom){
    newName = name;
    newCategory = category;
    newSymptom = symptom;
}

Allergy::~Allergy(){

}

//getters
string Allergy::getName() const{
    return newName;
}

string Allergy::getCategory() const{
    return newCategory;
}


list <string> Allergy::getSymptom() const{
    return newSymptom;
}

main.cpp中：

#include <iostream>
#include <string>
#include "Allergy.hpp"

using namespace std;


int main() {
    string name;
    string category;
    int numSymptoms;
    string symptHold;
    list <string> symptom;

    cout << "Enter allergy name: ";
    getline(cin, name);
    cout << "Enter allergy category: ";
    getline(cin, category);
    cout << "Enter number of allergy symptoms: ";
    cin >> numSymptoms;

    for(int i = 0; i < numSymptoms; i++){
        cout << "Enter symptom # " << i+1 << ": ";
        cin >> symptHold;
        symptom.push_back(symptHold);
    }

    Allergy Allergy_1(name, category, symptom);
    cout << endl << "Allergy Name: " << Allergy_1.getName() << endl <<
    "Allergy Category: " << Allergy_1.getCategory() <<  endl <<
    "Allergy Symptoms: ";

    for(auto& s : Allergy_1.getSymptom()){
        cout << s << ", ";
    }

    cout << endl;
    return 0;
}

Answer 1

您可以使用循环和一系列if语句来评估字符串中的枚举值。不幸的是，不像某种语言，enum不会附带他们名字的字符串表示。如何执行此操作的示例将是：

enum MyEnum{
    Value1,
    Value2,
    Value3
};

int main()
{
    bool isParsed=false;
    std::string line("");
    MyEnum myEnum;
    std::cout<<"Please enter your selection: ";
    while(!isParsed&&std::getline(std::cin,line)){
        if(line == "Value1"){
            isParsed = true;
            myEnum = Value1;
        }
        else if(line == "Value2"){
            isParsed = true;
            myEnum = Value2;
        }
        else if(line == "Value3"){
            isParsed = true;
            myEnum = Value3;
        }else{
            std::cout<<"Selection invalid, please enter a new selection: ";
        }
    }
}

在类中使用枚举来指定用户输入的值选项

1 个答案: