c++ - Simple questions about cin/cout overloading 4 -

#include <iostream> #include <math.h> #include <conio.h>  using namespace std;   class hugeint  { public:     int size;     int number[100];       friend istream& operator>>(istream&,hugeint&);     friend ostream& operator<<(ostream&,hugeint&); };   istream& operator>>(istream& in,hugeint& c) {     // code not shown     return in; }   ostream& operator<<(ostream& out,hugeint& c) {     return out; }   void main() {     system( "color 70" );       hugeint o;     hugeint y;     hugeint z;      cin >> o;     cout<<"now y "<<endl;     cin>>y; } 

the compiler complains operator >> ambigious... should ?

nope, the code compiles.

however please note did remove extraneous , non-c++ headers, , fixed incorrect main return type.