42 lines
1.2 KiB
Markdown
42 lines
1.2 KiB
Markdown
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---
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title: C++ Arrays
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localeTitle: C ++数组
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---
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## 什么是阵列？
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数组是一系列相同数据类型的元素，它们存储在连续的内存位置，可以单独引用。
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例如，包含5个称为数字的整数值的数组声明如下：
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```C++
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int numbers [5];
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```
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Initializiation：
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```C++
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//Initialization with entries:
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int numbers [5] = {1, 2, 3, 4, 5};
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//Initialization with no values:
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int numbers [5] = {};
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//Initialization with declaration:
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int numbers [] = {1, 2, 3, 4, 5};
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//Note that here the number of values defines the size of the array.
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//In the examples above, the size was fixed beforehand
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```
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**请注意** ，C ++中的数组在大小上是不可置换的，这意味着一旦声明了大小为5的数组，就无法将其放大或缩小。如果您确实需要具有相同条目的更大阵列，则必须将所有条目复制到更大尺寸的新阵列。
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### 访问：
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可以通过引用它们在数组中的位置来访问数组中的元素。 （从0开始计数）。
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例：
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```C++
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x = numbers[0]; // = 1. [0] == first position
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numbers[2] = 55; // Sets the third position (3) to the new number 55
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//numbers[] is now: {1, 2, 55, 4, 5}
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```
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