Bits

Hi /prog/rammers...

I'm an hobby programmer and I'm here to ask a really simple question... I tried to google it but I don't even know where to start my search

the notation:
0x00 = 00000000
how it is called?
how can I convert an 8bit array in this form?
for example how can I discover the notation or the bit pattern?
?? = 00110100
0xff = ??

can someone explain me the logic behind?

thank you...

Using a whole separate notation for hexadecimals is obviously retarded. Its waste of symbolsets.
There two representations which would fit better: purely alphabetic(A=0,B=1,C=2,D=3,E=4,F=5,G=6,H=7,I=8,J=9,K=10,L=11,M,=12,N=13,    O=14,P=15)  and numeric-alphabetic(used now 0-9/A-F).