Converting hex and storing into byte

Question

I want to convert a decimal value stored in a string into a hex value and store it in a byte variable. How can I do that?

eg

std::string DispalyAddress = params.substr(0,2);

The result is 12.

Now I want to convert 12 into hex ie C and store it in a byte variable. Something like

byte MyAddress = (byte)DispalyAddress.c_str();

Take a look at the [`std::hex`](http://en.cppreference.com/w/cpp/io/manip/hex) I/O manipulator. — πάντα ῥεῖ, Nov 10 '14 at 11:56
I have edited the question. I want a hex value in byte variable — user2837961, Nov 10 '14 at 11:59
@user2837961 You might need to [read this answer](http://stackoverflow.com/a/20024742) — HamZa, Nov 10 '14 at 12:06

score 1 · Accepted Answer · answered Nov 10 '14 at 12:06

Whatever you byte type is (I assume it's char or unsigned char), and if I correctly understood your question:

If you can use C++11, then do

byte MyAddress = (byte)std::stoi(DisplayAddress, 0, 16);

if not, then

byte MyAddress = (byte)strtol(DisplayAddress.c_str(), NULL, 16);

This will store value 18 (0x12) in MyAddress.

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