Compile C++ error -

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#include "std_lib_facilities.h"  int main() { constexpr double euro_to_dollar = 1.11; constexpr double yen_to_dollar = 0.0081; double dollar = 1.00;  char unit= 'a'; cout <"please enter value followed e or y: \n"; cin >>dollar>> unit; if (unit= 'e') cout << dollar << "euro == " << euro_to_dollar*dollar << "dollar\n"; else if (unit='y')         cout << dollar << "yen== " << yen_to_dollar * dollar << "dollar\n"; } 
 5   error: 'constexpr' not declared in scope   5   error: expected ';' before 'double'   7   error: expected ';' before 'double'   15  error: 'euro_to_dollar' not declared in scope  17  error: 'yen_to_dollar' not declared in scope

i'm doing problem programming: principles , practice using c++ (2nd edition)by bjarne stroustrup. , can see i'm doing wrong here. trying learn c++, beginner. appreciate guys.

i don't know there in local header file

#include "std_lib_facilities.h"

in place of added following lines of code

#include<iostream>  using namespace std;

if (unit = 'e')//doing assignment should correct follows

if (unit == 'e'), //checking equal or not

else if (unit ='y') should correct follows because of same reason

else if (unit =='y')

moreover should compile using compiler option -std=c++11


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