code: add Maximum

main.cpp

@@ -11,6 +11,7 @@ int main()
         << "A - B = " << a - b << '\n'
         << "A * B = " << a * b << '\n'
         << "A : B = " << a / b << '\n'
-        << "MAX(A, B) = " << max(a, b) << '\n';
+        << "MAX(A, B) = " << max(a, b) << '\n'
+        << "MIN(A, B) = " << min(a, b) << '\n';
     return 0;
 }