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Back to article list Search Articles Add Comment Printer friendly Direct link Par2: Declaring an array at runtime 2000-02-14 -- John Welsh I wanted to share this code with everyone. I worked out a way to declare
multi-dimensional arrays art runtime. I believe they could be REDIM'd in a
round about way. The code below works. Just create a .prj and turn of range
checking. You will see I took several people's ideas and put them together
with my own. Thanks to all who helped.
The idea here is to set up a 1 dimensional dynamic array that can be
accessed as if it is a multi-dimensinal array by calculating a pointer into
the one DIM array. The array could be REDIM'd by creating a NEW instance of
the curent one, copying the contents, DISPOSE of the first array, create it
again using new DIM's and then copy the saved array back into the just
created one. Finally, DISPOSE of the saved copy of the array. Now you will
have a new array of a different size. The code for the copy back might be a
bit tricky, but doable.
!******************************************************
tstarray program
map
testa
end
Test CLASS,TYPE
a SREAL,DIM(2) !Will let compiler know this is an array
END
x LONG !(x(y) + 1) Size(SREAL) --> will determine size of array
y LONG !
x1 LONG !Subscript values
y1 LONG !
code
testa
testa procedure
t & Test
s & STRING
xy LONG
ViewIt & CSTRING
code
!for t.a,DIM(x,y) where x = 10, and y = 5
! (normal) (dynamic)
! t.a[x1,y1] is equivalent to --> t.a[(x1 - 1) * y + y1] This is how the
subscripts translate from
!
a normal Clarion array to a dynamic one
x = 10
y = 5
xy = (x * y) * 4 + 4 !4 bytes for an SREAL + 4 to account for not using
the 0 position
ViewIt &= NEW(CSTRING(xy + 100))
ViewIt = '2 DIM array results|'
s &= NEW(STRING(xy))
t &= ADDRESS(s)
LOOP x1 = 1 TO x
LOOP y1 = 1 TO y
t.a[(x1 - 1) * y + y1] = y1 + (100 * x1)
ViewIt = ViewIt & FORMAT(t.a[(x1 - 1) * y + y1],@n_5)
END ! loop
ViewIt = ViewIt & '|'
END
ViewIt = ViewIt & 'End'
Message(ViewIt)
DISPOSE(t)
DISPOSE(ViewIt)
Today is November 21, 2024, 7:24 am This article has been viewed 35227 times.
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