Summary of Perl references

Perl references are similar to pointers in C language,

1 Reference of scalar variables:

$ Name = "Zhang ";

$ Ref =/$ name; # "/" adds this symbol to indicate a reference to the scalar $ name, that is, $ ref points to $ name.

Print $ ref; # The printed value is the address.

Print $ ref; # print the reference value. The $ sign added for Zhang. indicates that the referenced object is a scalar rather than an array.

 

$ Another = $ ref; # $ another is another reference of $ name.

$ Ref = "hello"; # $ FEF is a common scalar and is no longer referenced by $ name.

 

2 references to Arrays:

The reference method for arrays created in Perl is similar to that for scalar variables. Use a backslash to create an array:

$ Aref = // @ arr; # $ Aref contains a reference to the entire array @ arr.

You can use this reference $ Aref to access each part of @ arr:

$ Aref [0] # access the first element of array @ arr, which is the same as $ {$ Aref} [0 ].

@ $ Aref [2, 3] # access a piece of the array, which is the same as @ {$ Aref} [2, 3 ].

@ $ Aref # access the entire array, which is the same as @ {$ Aref }.

 

# Example of using references to access Arrays

Foreach (@ {$ Aref })

{

Print "$ _/N ";

}