双倍到常量字符* [英] Double to Const Char*

问题描述

如何将 double 转换为 const char，然后再将其转换回 double?

How can I convert a double into a const char, and then convert it back into a double?

我想将双精度转换为字符串，通过 fputs 将其写入文件，然后当我读取文件时，需要将其转换回双精度.

I'm wanting to convert the double to a string, to write it to a file via fputs, and then when I read the file, it will need to be converted back into a double.

我使用的是 Visual C++ 2010 Express Edition.

I'm using Visual C++ 2010 Express Edition.

推荐答案

如果你只是想把 double 值写入文件，你可以直接写，不用将它们转换为 const char*.将它们转换成 const char* 是多余的.

If you just want to write the double values to file, you can simply write it, without converting them into const char*. Converting them into const char* is overkill.

只需使用 std::ofstream 作为:

Just use std::ofstream as:

 std::ofstream file("output.txt")'

 double d = 1.989089;

 file << d ; // d goes to the file!

 file.close(); //done!

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