※ 引述《choufeng (Timothy)》之銘言：
: A computer has 256MB of memory. The word size of this computer is
: 64 bits. How many bits are needed to address any single word in memory?
: 請教這題要如何來看呢?謝謝。
先看一共幾個 word:
一個 word 64/8=8byte
總共 256 MB, 所以有 256MB /8 = 32 M(1024*1024) = 2^25 個 word
要定址就是每一個 word 都要給他一個號碼當 address
所以總共是 2^25 個 address
要 25 bit 才能表示
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