exit

 #include <iostream>
+#include <cstring>
 
 int main() {
     char buffer[256];
 
     std::cout << "Hello! Please enter some text:\n>> ";
     while (std::cin >> buffer) {
+		if (strcmp(buffer, "exit") == 0)
+			break;
+
         std::cout << buffer << std::endl;
         std::cout << ">> ";
     }