#include <string>
#include <fstream>
#include <sstream>
#include <iostream>
 
#include <stdlib.h>
using namespace std;
 
 
//從文件讀入到string里
string readFileIntoString(char * filename)
{
ifstream ifile(filename);
//將文件讀入到ostringstream對象buf中
ostringstream buf;
char ch;
while(buf&&ifile.get(ch))
buf.put(ch);
//返回與流對象buf關(guān)聯(lián)的字符串
return buf.str();
}
 
int main()
{
//文件名
char * fn="a.txt";
string str;
str=readFileIntoString(fn);
cout<<str<<endl;
system("pause");
 
}