C++ How do I to put this constructor in a cpp file? -

i have constructor in .h file

c(std::string s = "",int = 0,double d = 1) {     datamember1 = s;     datamember2 = i;         datamember3 = d; } 

if provide values of string, int , double use values, without them, use default ones. question how refactor put in .cpp file.

when not refactoring works fine example if declare

c object1("object1", 0, 1), object2; work, if refactor, object2 cause compile error saying don't have c() constructor

fwiw:

#include <iostream> #include <string> using namespace std;  class c{     public:     c(string a= "" , int foo=1, char bar=0); };  c::c(string a, int foo, char bar){ // can go .cpp file     cout<<a<<foo<<bar; }   int main() {     c c("hi",1,'t');     return 0; } 

on ideone .

but others stated should google "c++ tutorial"(actually deals similar in classes chapter) or read book. it'll lot frustrating,faster , fulfilling...