安装完数论库后，用一段代码测试显示 (operand types are 'std::istream {aka std::basic_istream<char>}' and 'NTL::ZZ')

安装完数论库（NTL）后，用一段代码测试显示no match for 'operator>>' (operand types are 'std::istream {aka std::basic_istream}' and 'NTL::ZZ')

你是不是忘记引入iostream库了