Wrong anti-spam code

Formulation

In the following code the variable integerFromUser is not properly declared. Write the command that needs to be put instead of the text // ??? // in order to obtain a valid C++ source file.

#include<iostream>
int main(){
   // ??? //
   std::cin>>integerFromUser;
   long squareOfTheNumber;
   squareOfTheNumber=integerFromUser*integerFromUser;
   std::string message;
   message="The square of the inserted number is";
   std::cout<<message<<" "<<squareOfTheNumber<<"\n";
   return 0;
}

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