rendered paste body#ifndef CALCULATOR_H#define CALCULATOR_H#include <Fl/Fl.H>#include <Fl/Fl_Input.H>#include <Fl/Fl_Button.H>#include <cstdlib>#include <cstring>#include <string>#include <cmath>class Calculator{private: int angle_mode;public: Calculator(); static void clear_cb(Fl_Widget* w, void* v); static void number_cb(Fl_Widget* w, void* v); static void pi_cb(Fl_Widget* w, void* v); static void sqrt_cb(Fl_Widget* w, void* v); static void frac_cb(Fl_Widget* w, void* v); void setAngleMode(int mode) { angle_mode = mode; } int getAngleMode() const { return angle_mode; }};#endif