CODEWITHSUNDEEP
c++function
RoundyMC
RoundyMC

Reputation: 3

How to set a custom variable name through a function argument

So what i am trying to do is basically get the second argument of a function, and making the second argument the name of a variable so i can easily store the users input. Here is my code

`

#pragma once
#include <iostream>

using namespace std;

void askAndStore(string question, string variable) 
{
    cout << question + " ";
    cin >> variable;
}

`

Upvotes: 0

Views: 915

Answers (2)

Caleth
Caleth

Reputation: 62704

You can't do this in C++.

You could have a std::map<std::string, SomeType> that you populate with your read-in names.

#pragma once
#include <iostream>
#include <map>
#include <string>

class Values
{
    std::map<std::string, std::string> values; 
public:
    void askAndStore(std::string question, std::string name) 
    {
        std::cout << question << " ";
        std::cin >> values[name];
    }

    std::string get(std::string name)
    {
        return values[name];
        // or return values.at(name); if name must already exist in values
    }
};

int main()
{
    Values user;
    user.askAndStore("What is your name?", "usersName");
}

That assumes your values are std::strings

Upvotes: 1

Hatted Rooster
Hatted Rooster

Reputation: 36483

Pass variable by reference:

void askAndStore(string question, string& variable) 
{
    cout << question + " ";
    cin >> variable;
}

string& instead of string. Without using & you'd be passing in a copy of your varaible, using a reference type string& you pass the actual variable in which is then modified by cin >> variable;.

P.S Don't use using namespace std;

Upvotes: 3

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