余弦的专栏

C++中float和double转换为string方法一：float f=4.345; sprintf(destination,"%f",f) std::string res = destination;方法二： 使用strstream头文件或sstream头文件。后者需将strstream换为stringstream。#include <strstream> std::strstream ss;

两个类相互调用//A.h #include "B.h" class A { public: B b; }//A.cpp #include "A.h" class A{}//B.h extern class A; class B { public: A* a; }//B.cpp #include "B.h" #include "A.h" class B{}

/** * 用于输出log文件的类. */ #ifndef LOG_H #define LOG_H //log文件路径 #define LOG_FILE_NAME "log.txt" //启用开关 #define LOG_ENABLE #include <fstream> #include <string> #include <ctim