字节数组翻番 [英] byte array to double

问题描述

我有一个4字节字符数组，我想将它转化成一倍。我怎样才能在C ++中实现这一点。

I have a four byte char array and I want to convert it to double. How can I achieve this in C.

推荐答案

浮动和双击是如此密切相关在 C 这也许并不需要显式转换。然而，这将是必要的传输到其他系统，或者以匹配的数据格式规范。这将做什么你问：

float and double are so closely related in C that an explicit conversion is probably not needed. However, it would be necessary for transmission to another system, or to match a data format specification. This will do what you ask:

union {
    char   c [4];
    float  f;
} x;
double d;

memcpy (x.c, character_source, sizeof x.c);
d = x.f;

这篇关于字节数组翻番的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！