[Update] int instead of unsigned int

game.cpp

@@ -7,28 +7,28 @@ using namespace std;
 
 class Game {
     private:
-        unsigned int upper;
-        unsigned int lower;
-        unsigned int count;
-        unsigned int answer;
+        int upper;
+        int lower;
+        int count;
+        int answer;
     public:
         Game(void) {
             this->reset();
         }
 
-        unsigned int get_upper() {
+        int get_upper() {
             return this->upper;
         }
 
-        unsigned int get_lower() {
+        int get_lower() {
             return this->lower;
         }
 
-        unsigned int get_count() {
+        int get_count() {
             return this->count;
         }
 
-        unsigned int get_answer() {
+        int get_answer() {
             return this->answer;
         }