Mã nộp #13657 | Tính giá trị hàm f(x)

Main.c:3:15: error: expected ‘;’, ‘,’ or ‘)’ before ‘&’ token
 void Nhap(int &a, int &b, int &c, int &x ){
               ^
Main.c: In function ‘main’:
Main.c:29:2: warning: implicit declaration of function ‘Nhap’ [-Wimplicit-function-declaration]
  Nhap(a,b,c,x);
  ^~~~