identifier string undefined

Question

I am receiving the error  identifier  string  undefined   However  I am including string h and in my main file  everything is working fine   CODE    pragma once  include  lt iostream gt   include  lt time h gt   include  lt string h gt   class difficulty   private      int lives      string level  public      difficulty void        difficulty void        void setLives int newLives       int getLives         void setLevel string newLevel       string getLevel         Can someone please explain to me why this is occurring

User · Accepted Answer

lt string h gt  is the old C header  C   provides  lt string gt   and then it should be referred to as std  string

User · Answer

You want to do  include  lt string gt  instead of string h and then the type string lives in the std namespace  so you will need to use std  string to refer to it

User · Answer

Perhaps you wanted to  include lt string gt   not  lt string h gt   std  string also needs a namespace qualification  or an explicit using directive

User · Answer

include  lt string gt  would be the correct c   include  also you need to specify the namespace with std  string or more generally with using namespace std

User · Answer

You must use std namespace  If this code in main cpp you should write  using namespace std    If this declaration is in header  then you shouldn t include namespace and just write  std  string level

User · Answer

Because string is defined in the namespace std  Replace string with std  string  or add  using std  string    below your include lines   It probably works in main cpp because some other header has this using line in it  or something similar

User · Answer

You forgot the namespace you re referring to  Add   using namespace std    to avoid std  string all the time

[c++] identifier "string" undefined?

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