Hexadecimal to Binary

[mjbauer95]

Are there any functions out there to convert Hex to Bin?

Like if I had 0xA0 it would convert it to 0b10100000.

But I mainly want this so I could get the say the first bit like:

bool getHex(char * hex, int place);

And I could write getHex(0xA0, 16) and it would return true.

[YarrOfDoom]

Try using the 'binary AND'-operator (&)

Example:
[code=c++]#include <iostream>
using namespace std;

int main() {
short val1 = 53; //00110101
short val2 = 4; //00000100
short val3 = val1&val2;
cout << val3;
return 0;
}

/* gives '4' as output because the 3rd bit of val1 is
'1', if it were '0', then the 3rd bit would of course be
'0' */[/code]
This example is written in C++, but if you use C, it shouldn't be too different.

[mjbauer95]

Thanks I knew it was something like that but it's nice to have the bytes.com community's help here on stuff that is really hard to find on Google.

[MrPickle]

You can always use a bitset if you want to convert something into binary.

[whodgson]

A book I once read by Jesse Liberty and David B Horvath,CCP pointed out that
for any binary number e.g.10100011111 10001
break it up into groups of 4 integers from RH end so:
bin 1010 0011 1111 0001 then put the hex symbol under each:
(dec) (10) (3) (15) (1)
hex A 3 F 1
result is 101000111111000 1 = A3F1 = 41,969
It will also work in the reverse direction.
The LH group may of course have < 4 binary symbols.
Hope this helps.

[YarrOfDoom]

I feel I should point out that you're breaking them up in bits, not integers. An integer is a number (not floating point), saved in a set of 4 bytes (1 byte = 8 bits). Actually, depending on the compiler you're using, it may be more or less than 4 bytes, you can look it this up by doing sizeof(int). This will return the number of bytes used by an integer.

[MrPickle]

(1 byte = 8 bits).

This is not always true, it can vary according to OS and hardware.

[YarrOfDoom]

Well yes, I should have thought of that too.

[JosAH]

Well yes, I should have thought of that too.

You should've written 'octet'; it sounds more elegant. Or even 'octette' (the female form) would make it sound even a bit sexy ;-)

kind regards,

Jos