Using a vector and string function to return a string?

Question

I want to make a simple function that takes an int as input, makes a vector filled with string elements, then returns a string corresponding to the index of the element.

Everything seems to be fine with the code, no red squiggly lines or anything, but when I compile nothing happens at all.

I've used the push_back() method to fill the vector, so that isn't the problem.

#include <iostream>
#include <vector>
#include <string>

races(int a) {
    std::vector<std::string> race = { "Human", "Cyborg", "Android", "Aster","Ool-Rog","Criataz" };
    return race[a];
};

I've run it on a browser coding site and nothing happens, and when I code it in Visual Studio I get an error:

"cannot find class to resolve delegate string"

To elaborate on what genpfault said, races() needs to be declared as std::string races(int a). But more importantly, where is your main() that actually calls races() at runtime? — Remy Lebeau
– Remy Lebeau, Commented Jun 19, 2019 at 1:06
the int main is missing because i just copied the function giving me trouble sorry ill be sure to include the full code next time. As the std::string races() was actually missing so thank you for your help guys. I am very new at programming. — hostboy221
– hostboy221, Commented Jun 19, 2019 at 16:00

Lucifer Morningstar · Accepted Answer · 2019-06-19 02:42:15Z

3

as per comments by genpfault and Remy Lebeau, here is a working code sample:

#include <iostream>
#include <vector>
#include <string>

std::string races(int a) {
    std::vector<std::string> race = { "Human", "Cyborg", "Android", "Aster","Ool-Rog","Criataz" };
    return race[a]; // or race.at(a);
};

int main () {
    std::cout << "Race with index: " << 2 << " is: " << races(2) << std::endl;
    return 0;
}

Example compilation and execution, with results on MAC OSX with C++ 14 installed, in Terminal utilities app:

$ /usr/local/bin/c++-9 races.cpp -o races
$ ./races
Race with index: 2 is: Android

Keep on coding!

edited Jun 19, 2019 at 2:42

answered Jun 19, 2019 at 1:46

Lucifer Morningstar

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1 Comment

ShadowRanger Over a year ago

The OP is (correctly) avoiding the use of using namespace std;; please don't encourage bad habits by adding it to their code for minimal benefit. See Why is “using namespace std;” considered bad practice?

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