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                            1\.值傳遞 如果在函數內修改了變量的值,函數外變量的值,不會變

2\.引用傳遞: 默認,對象和資源是引用傳遞.形參使用&,可以將其它變量變成”引用傳遞”

3\.默認參數:默認參數只能放在非默認參數的右邊,默認參數的值,幾乎所有類型都可以,但是不能是函數的調用,資源,對象. 默認參數不能是變量名,但可以是常量


                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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