---

Lỗi biên dịch:

Main.cc: In function ‘int main()’:
Main.cc:13:16: error: ‘Math’ was not declared in this scope
   13 |         tmp1 = Math.Abs(a - b) / 2;
      |                ^~~~
Main.cc:18:13: error: ‘Math’ was not declared in this scope
   18 |         if (Math.Abs(a - n) < Math.Abs(b - n)) tmp2 = Math.Abs(a - n);
      |             ^~~~