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                            [ ]操作符可以對向量進行讀和寫，這和apstring訪問字符類似。同樣和apstring一樣，索引從0開始，count[ 0 ]指的是向量中的第0個元素，count[ 1 ]指的是向量中的第1個元素。[ ]操作符可以應用在任何表達式中。

~~~
count[0] = 7;
count[1] = count[0] * 2;
count[2]++;
count[3] -= 60;
~~~

所有的這些語句都是合法的賦值語句。下圖是這些代碼段的效果：

　　　Count

　　　![enter image description here](https://box.kancloud.cn/2015-09-02_55e642c9a4ffd.jpg)
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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