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 0; }
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原文：https://www.cnblogs.com/cunyusup/p/8945951.html