mathematical equation implmentation in c++

[pdk5]

Hello,

I need to implement the following math conversion in the c++. I am looking for simple function. Could you help me with this., I am not much aware of the maths functionalities available in c++

1. Need to convert dBns to ns and the in the xml requirements, I see the formula as : 10^(0.8 * x)

2. Other conversion is similar(mBradians to radians) : 10 ^ (0.001 * x)
Then I need the convert the radians to degrees

Thanks a lot
pdk