---

Lỗi biên dịch:

Main.cc: In function ‘int main()’:
Main.cc:11:14: error: expected ‘;’ before ‘)’ token
  for (tg >= n){
              ^
Main.cc:11:10: warning: statement has no effect [-Wunused-value]
  for (tg >= n){
       ~~~^~~~
Main.cc:18:27: error: expected ‘)’ before ‘;’ token
  printf(" pi = %0.5f", pi);
                           ^
Main.cc:9:6: warning: unused variable ‘signal’ [-Wunused-variable]
  int signal = -1;
      ^~~~~~
Main.cc:5:7: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%f", &n);
  ~~~~~^~~~~~~~~~