C compile time error expected identifier before numeric constant

Question

I have read other similar posts but I just don t understand what I ve done wrong  I think my declaration of the vectors is correct  I even tried to declare without size but even that isn t working What is wrong    My code is    include  lt vector gt    include  lt string gt   include  lt sstream gt   include  lt fstream gt   include  lt cmath gt   using namespace std   vector lt string gt  v2 5   null    vector lt  vector lt string gt   gt  v2d2 20 v2    class Attribute   attribute and entropy calculation       vector lt string gt  name 5     error in these 2 lines     vector lt int gt  val 5 0       public      Attribute      int total T F         int main       Attribute attributes  return 0

User · Answer

Since your compiler probably doesn t support all of C  11 yet  which supports similar syntax  you re getting these errors because you have to initialize your class members in constructors   Attribute     name 5  val 5 0

User · Answer

Initializations with       in the class body is not allowed  Use      or        Unfortunately since the respective constructor is explicit and vector has an initializer list constructor  you need a functional cast to call the wanted constructor  vector lt string gt  name   decltype name  5   vector lt int gt  val   decltype val  5 0     As an alternative you can use constructor initializer lists   Attribute   name 5   val 5  0

User · Answer

You cannot do this   vector lt string gt  name 5     error in these 2 lines vector lt int gt  val 5 0     in a class outside of a method   You can initialize the data members at the point of declaration  but not with    brackets   class Foo       vector lt string gt  name   vector lt string gt  5       vector lt int gt  val vector lt int gt  5 0         Before C  11  you need to declare them first  then initialize them e g in a contructor  class Foo       vector lt string gt  name      vector lt int gt  val   public    Foo     name 5   val 5 0

[c++] C++ compile time error: expected identifier before numeric constant

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