xcode - Undefined symbols for architecture x86_64: c++ -

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i'me getting error in xcode undefined symbols architecture x86_64: "restaurant::restaurant()", referenced from: _main in main.o ld: symbol(s) not found architecture x86_64 clang: error: linker command failed exit code 1 (use -v see invocation)

this code:

#include <iostream> using namespace std;   class restaurant { public:     restaurant();     int gettables();     int gettempstaff();     int getpermstaff();     string getshifts();     string getmenu(string menu); private:     string menu;     int tables;     int tempstaff;     int permstaff;     string shifts[3]; };  string restaurant::getmenu(string menu) {     menu = menu;     return menu; }  int main() {     restaurant mimmos;       string menu;     cout<<"menu: ";     cin>>menu;     cout<<mimmos.getmenu(menu);      return 0;  }

please help.

you have following methods declared:

restaurant(); int gettables(); int gettempstaff(); int getpermstaff(); string getshifts(); string getmenu(string menu);

.. , you've defined restaurant::getmenu below. problem here although you've declared restaurant::restaurant (the constructor), haven't defined it.

but that's true of restaurant::getshifts, why aren't getting error aswell?

it's because constructor automatically called when object of type being created, here:

//.. restaurant mimmos; //..

. never end trying call restaurant::getshifts (or other non-constructor methods matter) there's no error.

you can define constructor default (which allows compiler make sensible 1 you) other answer-er said or can define own, seem want anyway.


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