用stringstream实现从数字到字符串的转化

代码简单，字符串到数字和数字到字符串的写法类似。

#include <sstream>
#include <bits/stdc++.h>
using namespace std;

int main()
{
    double num = 0.123456;
    string s;
    stringstream sstream;

    sstream << num;
    sstream >> s;

    cout << s << endl;

    sstream.clear();

    return ;
}

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