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                            ### extern修飾
extern關鍵字的意思是進行聲明.但是一般不使用,因為在給變量賦值的時候已經聲明了. 而且extern必須放在靠上的位置進行聲明,在使用之后進行聲明是無效的.也就是說必須要先聲明,后使用.聲明的時候盡量寫在.h文件中.對函數來說,聲不聲明沒有太大的意義,因為所有的函數都是全局函數.
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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