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Task/Forward-difference/Visual-FoxPro/forward-difference.visual

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+#DEFINE CTAB CHR(9)
+LOCAL lcList As String, i As Integer, n As Integer
+n = 10
+LOCAL ARRAY aa[n]
+CLEAR
+lcList = "90,47,58,29,22,32,55,5,55,73"
+FOR i = 1 TO n
+    aa[i] = VAL(GETWORDNUM(lcList, i, ","))
+ENDFOR
+ShowOutput("Original", @aa)
+k = n - 1
+FOR i = 1 TO n - 1
+    ForwardDiff(@aa)
+    ShowOutput("Difference " + TRANSFORM(i), @aa)
+ENDFOR
+
+PROCEDURE ForwardDiff(a)
+LOCAL i As Integer, n As Integer
+n = ALEN(a)
+LOCAL ARRAY b[n-1]
+FOR i = 1 TO n - 1
+    b[i] = a[i+1] - a[i]
+ENDFOR
+DIMENSION a[n-1]
+ACOPY(b, a)
+ENDPROC
+
+PROCEDURE ShowOutput(lcLabel, zz)
+LOCAL i As Integer, n As Integer, lcTxt As String
+n = ALEN(zz)
+lcTxt = lcLabel + ":" + CTAB
+FOR i = 1 TO n
+    lcTxt = lcTxt + TRANSFORM(zz[i]) + CTAB
+ENDFOR
+lcTxt = LEFT(lcTxt, LEN(lcTxt) - 1)
+? lcTxt
+ENDPROC