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Task/Pointers-and-references/FreeBASIC/pointers-and-references.freebasic

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+' FB 1.05.0 Win64
+
+Type Cat
+  name As String
+  age As Integer
+End Type
+
+Type CatInfoType As Sub (As Cat Ptr)
+
+Sub printCatInfo(c As Cat Ptr)
+  Print "Name "; c->name, "Age"; c-> age
+  Print
+End Sub
+
+' create Cat object on heap and store a pointer to it
+Dim c As Cat Ptr = New Cat
+
+' set fields using the pointer and the "crow's foot" operator
+c->name = "Fluffy"
+c->age = 9
+
+' print them out through a procedure pointer
+Dim cit As CatInfoType = ProcPtr(printCatInfo)
+cit(c)
+
+Delete c
+c = 0
+
+Dim i As Integer = 3
+' create an integer pointer variable and set it to the address of 'i'
+Dim pi As Integer Ptr = @i
+
+'change the variable through the pointer
+*pi = 4
+
+'print out the result
+print "i ="; *pi
+
+'create a reference to the variable i
+Dim ByRef As Integer j = i
+
+' set j (and hence i) to a new value
+j = 5
+
+' print them out
+Print "i ="; i, "j ="; j
+Sleep