c++求助

#include <iostream>
using namespace std;

int main(){
	 char a=' ';
         int b;
	 float c;
	 double d;
	 cin>>a>>b>>c>>d;
	 cout<<a<<" "<<b<<" ";
	 cout<<fixed<<setprecision(6);
	 cout<<c<<" "<<d
}

这一行报错

cout<<fixed<<setprecision(6);