---

Lỗi biên dịch:

Main.cc: In function ‘int main()’:
Main.cc:9:8: error: invalid operands of types ‘’ and ‘int’ to binary ‘operator>>’
     sin>>a>>b>>x>>y;
     ~~~^~~
Main.cc:10:11: error: expected primary-expression before ‘{’ token
     cosl<<{(a*x)+(b*y)};
           ^