I’m getting the error “stoi is not a member of std” in myprogramminglab [duplicate]

edit: this question has been marked as a duplicate. I did indeed look through all the previous similar questions I could find and haven’t found an answer. Basically, I am not able to control how the program compiles (though I think it’s already using c++11), so I’m either looking for a reason why stoi isn’t working in this context OR any alternative statements that could serve the same purpose.

I’m pretty new to c++ and am working on this project for class. It has to be submitted through myprogramminglab.com so I can’t modify the compiler. The problem I’m running into is I get the following error:

CTest.cpp: In function 'void getTime(int&, int&, bool&, std::string)':
CTest.cpp:38: error: 'stoi' is not a member of 'std'
CTest.cpp:39: error: 'stoi' is not a member of 'std'

I understand from googling that this usually would mean that my compiler isn’t configured for C++11. But like I said I have no control over that aspect of myprogramminglab. Am I missing something in my code that might be able to get stoi up and running. Or if not, is there an “old” way of doing this that I can use? I can’t find a good solution in my book (though I admit I might just not know what to look for) and can’t test the rest of my code until I get past this compile error.

If it’s not obvious from the code, the assignment it to take input in the format HH:MM xm and calculate how many minutes are in between the two times, and output the amount in minutes (and hours and minutes) of that difference. I also have to use a function named computeDifference with the parameters mentioned (though I added the string parameter because I wanted to get the input outside of the function).

#include <iostream>
#include <string>
using namespace std;
int computeDifference(int hours_par, int minutes_par, bool isAM_par, int hoursF_par, int minutesF_par, bool isAMF_par);
void getTime(int& minutes, int& hours, bool& isAM);
int main()
{
    int hours, minutes, fut_hours, fut_minutes, difference;
    bool isAM, fut_isAM;
    cout << "Enter start time, in the format 'HH:MM xm', where 'xm' is\n";
    cout << "either 'am' or 'pm' for AM or PM:";
    getTime(hours, minutes, isAM);
    cout << "Enter future time, in the format 'HH:MM xm', where 'xm' is\n";
    cout << "either 'am' or 'pm' for AM or PM:";
    getTime(fut_hours, fut_minutes, fut_isAM);
    difference = computeDifference(hours, minutes, isAM, fut_hours, fut_minutes, fut_isAM);
    cout << "There are " << difference << " minutes (" << (difference - (difference%60))/60 << " hours and " << difference%60 << " minutes) between" << hours << ":" << minutes<< " and " << fut_hours << ":" << fut_minutes;

    return 0;
}
int computeDifference(int hours_par, int minutes_par, bool isAM_par, int hoursF_par, int minutesF_par, bool isAMF_par) {
    int start_total = 0, future_total = 0;
    start_total += hours_par * 60;
    start_total += minutes_par;
    if (isAM_par)
        start_total += 720;
    future_total += hoursF_par * 60;
    future_total += minutesF_par;
    if (isAMF_par)
        future_total += 720;

    return future_total - start_total;
      }
void getTime(int& minutes, int& hours, bool& isAM, string timestamp) {
    string hoursS, minutesS;
    hoursS = timestamp.substr(0, 2);
    minutesS = timestamp.substr(3, 2);
    hours = std::stoi(hoursS);
    minutes = std::stoi(minutesS);
    isAM = ("am" == timestamp.substr(6, 2));
    cout << hours << " " << minutes << " " << isAM;
    cout << timestamp;
}

I’ve tried it a few different ways, for example without the std:: part. But this seems to give me the least errors…

Any help would be greatly appreciated! Thanks![

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