C++ - Deprecated conversion from string constant to char -

i don't understand why compiler giving me warning deprecated conversion string char.

this complaining warning:

just bit of background of i'm doing.. i'm trying understand , practice exceptions... i'm not sure if better work char[1000] first name , on.. appreciate if understand warning , me find solution.. thanks..

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class teloenyuco { string fn, ln, r;     double income;  public:     const char *getters(){return fn.data(), ln.data(), r.data();}     virtual char *getfacilityaccess()=0;     teloenyuco(char *fn, char *ln, char r, double inc)     {         if(fn==0) throw exception(1, "first name null"); //warning #1         if(ln==0) throw exception(2, "last name null");  //warning #2         if(r==0) throw exception(3, "rank null");        //warning #3         if(inc<=0) throw exception(4, "income null");    //warning #4          fn=fn;         ln=ln;         r=r;         income=inc;     } }; 

=====================exception class=================================

class exception {     int code;     string mess;  public:     exception(int cd, char *mess)     {         code=cd;         mess=mess;     }     int getcode(){return code;}     const char *getmess(){return mess.data();} }; 

i assume exception's constructor signature

exception(int, char*) 

you pass string literal parameter, actual type const char*, implicit conversion char* legal pre-c++11 (but deprecated, warning).

modify signature to

exception(int, const char*) 

or, better yet,

exception(int, const std::string&) 

to summarize:

char* x       = "stringliteral";  //legal pre-c++11, deprecated const char* y = "stringliteral";  // std::string z  ("stringliteral"); // better