c++ - ostream implementatuon using printf -

how implement ostream-like class scratch using printf only?
me looks problem in choosing format string ,which equal identifying input`s type , treating precision

i assume mean overloads operator<< "an ostream-like class". it's easy identify type of argument function having overloads. example, might have:

ostreamlike& ostreamlike::operator<<(int x) {   printf("%d", x);   return *this; }  ostreamlike& ostreamlike::operator<<(float x) {   printf("%f", x);   return *this; } 

the format of output determined whichever overload picked.