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    <p>So it looks like you want to use a namespace "Choice", but you did not define it first. To define a new namespace, define it like in :</p> <pre><code>namespace X { // namespace definition int a; int b; } using namespace X; //then you can use it </code></pre> <p>But in fact, I am not sure you need to define any namespace... In your case, the problem I identify is that you declare "enum class Choice", instead of simply "enum Choice". Please read for example this link about enum usage in c++ : <a href="http://www.cplusplus.com/forum/beginner/44859/" rel="nofollow">http://www.cplusplus.com/forum/beginner/44859/</a></p> <p>I modified your code this way and it is running fine :</p> <pre><code>#include"stdafx.h" #include&lt;iostream&gt; #include&lt;string&gt; #include&lt;ctime&gt; using namespace std; enum Choice { rock, paper, scissors }; Choice player_choice; //holds user's move Choice machine_choice; //holds machine's move string words[3] = {"rock","paper","scissors"}; Choice get_machine_choice(); void decide_winner(); string get_msg(Choice winner); int rand0toN1(int n); int main(int argc, char *argv[]) { srand(time(NULL)); //set randomization string input_str; int c; while (true) { cout &lt;&lt; "Enter Rock, Paper, Scissors, or Exit: "; getline(cin, input_str); if (input_str.size() &lt; 1) { cout &lt;&lt; "Sorry, I don't understand that.\n"; continue; } c = input_str[0]; if (c == 'R' || c == 'r') player_choice = rock; else if (c == 'P' || c == 'p') player_choice = paper; else if (c == 'S' || c == 's') player_choice = scissors; else if (c == 'E' || c == 'e') break; else { cout &lt;&lt; "Sorry, I don't understand that.\n"; continue; } machine_choice = get_machine_choice(); int p = (int) player_choice; int c = (int) machine_choice; cout &lt;&lt; "You Choose " &lt;&lt; words [p]; cout &lt;&lt; "," &lt;&lt; endl; cout &lt;&lt; "I choose " &lt;&lt; words [c]; cout &lt;&lt; "," &lt;&lt; endl; decide_winner(); } return EXIT_SUCCESS; } Choice get_machine_choice() { int n = rand0toN1(3); if (n == 0) return rock; if (n == 1) return paper; return scissors; } void decide_winner() { if (player_choice == machine_choice) { cout &lt;&lt; "Reult is a tie.\n\n"; return; } int p = static_cast&lt;int&gt;(player_choice); int c = static_cast&lt;int&gt;(machine_choice); if (p - c == 1 || p - c == -2) { cout &lt;&lt; get_msg(player_choice); cout &lt;&lt; "Unfortunantly, you win...\n"; } else { cout &lt;&lt; get_msg(machine_choice); cout &lt;&lt; "I WIN, BEEEATCH!!!!\n"; } cout &lt;&lt; endl; } string get_msg(Choice winner) { if (winner == rock) return string("Rock smashes scissors, beeatch..."); else if (winner == paper) return string("You know what paper does to rock, COVERAGE!!..."); else return string("CHOP! Scissors cut paper!!...."); } int rand0toN1(int n) { return rand() % n; } </code></pre>
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    1. USGael Jaffrain
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