独坐大雄风

The IO types are defined in three seperate headers:iostream defines the types used to read and write to a console window;fstream defines the types used to read and write named files;sstream defi

这么点简单的东西总是记不清，气死人了，干脆粘贴在这好了#include#includeusing namespace std;int main(){cout//coutcout 3.1415926 coutcoutcout}setw(n)用法： 通俗地讲就是预设宽度如

数字转字符串：#include #include string num2str(int i) { stringstream ss; ss << i; return ss.str();}字符串转数字：#include #include int str2num(string s) { int i; stringstream ss(