> For the complete documentation index, see [llms.txt](https://beej-c-zhtw.netdpi.net/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://beej-c-zhtw.netdpi.net/3.-bian-shu-yu-chen-shu-shi/3.1.-bian-shu.md).

# 3.1. 變數

可以說「變數存值」，但另一種思考角度，變數是人類可讀的名稱，而它代表記憶體中的某些資料。

我們要花一點時間，從兔子洞裡窺一眼，這個洞是指標。別擔心。

您可以將記憶體視為一個大型的位元組（bytes）陣列\[32]。資料儲存在此「陣列」\[33]中。如果數字大於一個位元組，則以多個位元組來儲存。由於記憶體就像陣列，記憶體的每個位元組都可以由其索引來參照。記憶體中的這個索引也稱為位址、位置或指標。

當您在C中有變數時，該變數的值會存在記憶體中的某個位置、某個位址。（不然它還能在哪裡呢？）但是用數值位址來表示一個值是很困難的，所以我們為它取了一個名稱，這就是變數名稱。

我提出這一切的原因有兩個：

這將使以後更易於理解指標變數 — 它們是包含其他變數地址的變數！ 而且，它也會讓以後更容易理解指標。 所以變數是一些資料的名稱，這些資料儲存在記憶體的某個位置上。

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