[Add] command line number guessing game

game.cpp

@@ -0,0 +1,79 @@
+#include <iostream>
+#include <cstring>
+#include <cstdlib>
+#include <ctime>
+
+using namespace std;
+
+class Game {
+    private:
+        unsigned int upper;
+        unsigned int lower;
+        unsigned int count;
+        unsigned int answer;
+    public:
+        Game(void) {
+            this->reset();
+        }
+
+        unsigned int get_upper() {
+            return this->upper;
+        }
+
+        unsigned int get_lower() {
+            return this->lower;
+        }
+
+        unsigned int get_count() {
+            return this->count;
+        }
+
+        unsigned int get_answer() {
+            return this->answer;
+        }
+
+        void reset() {
+            this->upper = 999;
+            this->lower = 0;
+            this->count = 0;
+            this->answer = rand() % 1000;
+        }
+
+        bool guess(int num) {
+            this->count++;
+            if (num == answer) return true;
+
+            if (num > answer) this->upper = num;
+            else if (num < answer) this->lower = num;
+
+            return false;
+        }
+};
+
+int main(int argc, char const *argv[]) {
+    srand(time(nullptr));
+
+    Game game;
+
+    for (int i = 0; i < argc; i++) {
+        if (strcmp("-debug", argv[i]) == 0) {
+            cout << "[Debug] " << game.get_answer() << endl;
+        }
+    }
+
+    while (true) {
+        int guess;
+        cout << "Guess: ";
+        cin >> guess;
+        if (game.guess(guess)) {
+            cout << "Answer correct. You have guessed for " << game.get_count() << " times." << endl;
+            break;
+        } else {
+            cout << "Answer is fewer than " << game.get_upper() << endl;
+            cout << "Answer is more than " << game.get_lower() << endl;
+            cout << "------------------------" << endl;
+        }
+    }
+
+    return 0;
+}