将char转换为double

Question

I am writing a code for data acquisition for my hardware.

However, I need to find the average of the data that I have collected.

Here's the problem, the acquired data is in unsigned char format and I need to convert it to double format. Furthermore, the data collected is in exponential form [1.789232E-05].

Is there any possible way of converting a unsigned char to double then back again??

I have got a double j and a unsigned char a[200]
The unsigned char consist of 1.789232E-05. How do I convert that data to double?

Thank you!

Answer 1

you could try to use atof for converting from char to double ,as for representing an double to an char I suggest you use char* to store the converted double.

Link to atof from msdn : http://msdn.microsoft.com/en-us/library/hc25t012%28v=vs.71%29.aspx

Answer 2

"Exponential form" doesn't mean anything concrete. If the data is on 8 bits, it is probably in G.711 format, either A-Law or μ-Law. Depending on which one, you'll have to use a different conversion routine. (In both cases, the 8 bit format is 1 bit sign, 3 bits exponent, and 4 bits mantissa.)