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                            ### 數組概念
把數據碼成一排進行存放.

### 數組基礎
![](https://box.kancloud.cn/43a9c23f12c5f8017c10bff7f970615f_1601x534.png)


### 概述
    * 快速查詢 . scores[2]
    * 數組最好應用于"索引有語意"的情況.
    * 但并非所有有語意的索引都適用于數組,如身份證號.
    * 數組的本質和數據庫是一樣的,存儲完數據后對數據進行增刪改查.只是這些數據存放在內存中.


### 需要明白的
1. 數組第一個元素的索引是0
2. 數組最后一個元素的索引是size - 1




                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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