这是我编译器出问题了吗？怎么修改？

Question

Answer 1

double 类型用 %lf, 是字母l不是数字1. 这里有个不需要配置的在线编译器，

Online C++ Compiler The user friendly C++ online compiler that allows you to Write C++ code and run it online. The C++ text editor also supports taking input from the user and standard libraries. It uses the GCC (g++) compiler to compiler code. https://www.programiz.com/cpp-programming/online-compiler/

编译小程序很方便。