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#include <iostream>
#include <random>
#include <cstdlib>
 
using namespace std;
 
int main(){
 
int END = 0;
int attempts = 0;
string repeat;
 
while(END <= 0 || attempts > 3){
	int answer = rand()%21;
	int guess;
	int attempt;
 
	cout << "I'm thinking of a number from 1 through 20.\n\n";
	cin >> guess;
	if(guess == answer){
		cout << "Congratulations, you've won!\n\n";
		END += 1;
		system("pause");
		}
	else{
		attempt += 1;
		cout << "That's not the right number, guess again.\n\n";
		}
	}
{
	cout << "You've guessed wrong 3 times. The answer was " << answer << ".\n\n";
	cout << "Play again? [Y N]";
	if(repeat == "y"){
		END == 0;
		attempts == 0;
		repeat == "x";
	}
	else{
		cout << "Thanks for playing!\n\n";
		system("pause");
	}
}
}

In file included from prog.cpp:2:
In file included from /usr/bin/../lib/gcc/i586-linux-gnu/4.9/../../../../include/c++/4.9/random:35:
/usr/bin/../lib/gcc/i586-linux-gnu/4.9/../../../../include/c++/4.9/bits/c++0x_warning.h:32:2: error: This file requires compiler and library support for the ISO C++ 2011 standard. This support is currently experimental, and must be enabled with the -std=c++11 or -std=gnu++11 compiler options.
#error This file requires compiler and library support for the \
 ^
prog.cpp:31:61: error: use of undeclared identifier 'answer'
        cout << "You've guessed wrong 3 times. The answer was " << answer << ".\n\n";
                                                                   ^
prog.cpp:34:7: warning: equality comparison result unused [-Wunused-comparison]
                END == 0;
                ~~~~^~~~
prog.cpp:34:7: note: use '=' to turn this equality comparison into an assignment
                END == 0;
                    ^~
                    =
prog.cpp:35:12: warning: equality comparison result unused [-Wunused-comparison]
                attempts == 0;
                ~~~~~~~~~^~~~
prog.cpp:35:12: note: use '=' to turn this equality comparison into an assignment
                attempts == 0;
                         ^~
                         =
prog.cpp:36:10: warning: equality comparison result unused [-Wunused-comparison]
                repeat == "x";
                ~~~~~~~^~~~~~
prog.cpp:36:10: note: use '=' to turn this equality comparison into an assignment
                repeat == "x";
                       ^~
                       =
3 warnings and 2 errors generated.

Standard output is empty