stdio支持

include/bstl/big_integer.hpp

@@ -2,6 +2,7 @@
 #define BETTERSTL_BIG_INTEGER_HPP
 
 #include <string>
+#include <iostream>
 
 namespace bstl {
 
@@ -65,6 +66,10 @@ private:
     static std::string divAbs(const std::string& a, const std::string& b);
 };
 
+// 流运算符重载
+std::ostream& operator<<(std::ostream& os, const BigInteger& bi);
+std::istream& operator>>(std::istream& is, BigInteger& bi);
+
 } // namespace bstl
 
 #endif //BETTERSTL_BIG_INTEGER_HPP