kernel virtual address caculation

I had an interesting chat with my friend qunying about how to caculate the hex presentation of address to a size:

(14:29:56) vincentinsz: on x86 32bit the kernel image located at physical address 1MiB, which translate to 0x00100000, but how 0x00100000 equals 1M, how to caculate it?
(14:32:00) qunying: 1024*1024 = 0x100000
(14:32:11) qunying: that is 1MiB
(14:33:56) vincentinsz: is there easy way to see 0x100000 as 1024 * 1024?
(14:34:18) qunying: just count the zeros
(14:34:36) qunying: one 0 in hex is 2^^2
(14:34:49) qunying: there is 5 zero, that is 2^^10
(14:35:00) qunying: that is 1M
(14:35:54) qunying: one 0 is 2^^4
(14:35:58) qunying: not 2,
(14:36:09) qunying: 5 zero is 2^^20
(14:37:59) vincentinsz: how do you get one 0 is 2^^4?
(14:38:27) qunying: for one number in hex represents 4 bits in binary
(14:38:55) qunying: 0x10 = 2^4, 0x100 = 2^8, etc
(14:40:01) vincentinsz: 0x10 = 1000 0000
(14:40:13) qunying: ya
(14:40:23) qunying: no
(14:40:29) qunying: 001 000
(14:40:34) qunying: 0001 0000
(14:40:47) vincentinsz: i see
(14:42:20) vincentinsz: what about some other hex address like 0xC0000000 which is about 3G, How to caculate
(14:45:10) vincentinsz: so there is 7 0s which is 2^^28?
(14:45:24) qunying: ya
(14:45:35) qunying: C is 1100
(14:46:00) qunying: so times 2^12
(14:46:35) vincentinsz: ah, so 2^^30 * 3?
(14:48:33) qunying: ya


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