stringstream流格式化符，把int转化为string,string又可以转为C语言风格的字符串

#include<iostream>#include<sstream>#include<string>using namespace std;int main( void ){    int i = 12345;stringstream s;//流格式化符，把int转化为strings << i;string str = s.str(); //等到string类型的字符串 cout << str << endl;const size_t BUF_SIZE = 8;char buf[BUF_SIZE];strcpy( buf, str.c_str( ));cout << buf << endl; //等到C语言风格(C-style)的字符串     system( "PAUSE" );    return EXIT_SUCCESS;}/*-----------1234512345请按任意键继续. . .-----------------------*/