字符串在科学记数法C ++到双重转换 [英] String in scientific notation C++ to double conversion

问题描述

我有一个数据库填充了两个如下所示：

I've got a database filled up with doubles like the following one:

1.60000000000000000000000000000000000e+01

有人知道如何将这样的数字转换为C ++中的双数吗？

Does anybody know how to convert a number like that to a double in C++?

有没有标准的方式来做这种类型的事情？

Is there a "standard" way to do this type of things? Or do I have to roll my own function?

现在我正在这样做：

#include <string>
#include <sstream>



int main() {
    std::string s("1.60000000000000000000000000000000000e+01");
    std::istringstream iss(s);
    double d;
    iss >> d;
    d += 10.303030;
    std::cout << d << std::endl;
}

谢谢！

推荐答案

这样的东西？这将是C ++的做法...

Something like this? This would be the "C++" way of doing it...

#include <sstream>
using namespace std;

// ...

    string s = "1.60000000000000000000000000000000000e+01";
    istringstream os(s);
    double d;
    os >> d;
    cout << d << endl;

打印16。

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