Digit to numbers using vectors and strings

[Kyi]

I like to convert digit to number and number to digit only using vectors and strings. And when I run this code on Dev c++, an error message "Vector was not declared in this scope...suggested alternative" like this appears. Is that supposed to be? I checked again and again my code(actually copied from a website), I don't find any errors. Can anyone explain this?

#include "iostream"
#include "vector"
#include "string"
#include "algorithm"

int main () 
{
	vector<string>names;
	vector<string>digits;
    {names.push_back("zero"); digits.push_back("0");
    names.push_back("one"); digits.push_back("1");
    names.push_back("two"); digits.push_back("2");
    names.push_back("three"); digits.push_back("3");
    names.push_back("four"); digits.push_back("4");
    names.push_back("five"); digits.push_back("5");
    names.push_back("six"); digits.push_back("6");
    names.push_back("seven"); digits.push_back("7");
    names.push_back("eight"); digits.push_back("8");
    names.push_back("nine"); digits.push_back("9");
    }
	string input;
    while (cin >> input) {
        bool ok = false;
        for (int i = 0; i < 10; ++i) {
            if (input == names[i]) {
                cout << digits[i] << endl;
                ok = true;
            } else if (input == digits[i]) {
                cout << names[i] << endl;
                ok = true;
            }
         }
         if (! ok) cout << "Unknown number" << endl;
    }

    // keep_window_open();
    return 0;
}

[Peter87]

Names in the standard library are located in the std namespace. If you put std:: in front of vector, string, cin, cout and endl it should work.

int main () 
{
	std::vector<std::string>names;
	...

[Kyi]

Thanks a million :3 :3 #Peter87