知道了C++的I/O设施之后。这些就变的非常easy了。

假设你常常使用，时间长了就会有感觉。这个事情是多此一举吗？就当是练习吧，知道原理之后，你会认为用起来更舒畅，更喜欢C++了。

#include <iostream>

#include <vector>

#include <string>

#include <sstream>

#include <algorithm>

#include <iterator>

using namespace std;

template<typename Result,typename Para>

Result lexical_cast(Para para)

{

    stringstream ss;

    ss<<para;

    Result result;

    ss>>result;

    return result;

}

//int ACE_TMAIN(int argc, ACE_TCHAR *argv[])

int main(int argc, char *argv[])

{

    double arr[10] = {0.1,1.2,2.3,3.4,4.5,5.6,6.7,7.8,8.9,9.0};

    vector<string> str_arr;

    for (size_t i =0 ; i< sizeof(arr)/sizeof(double) ; ++i)

    {

        str_arr.push_back(lexical_cast<string>(arr[i]));

    }

    ostream_iterator<string> out(cout," ");

    copy(str_arr.begin(),str_arr.end(),out);

    return 0;

}

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