new files

Task/Binary-search/BASIC/binary-search-1.bas

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+FUNCTION binary_search ( array() AS Integer, value AS Integer, lo AS Integer, hi AS Integer) AS Integer
+  DIM middle AS Integer
+
+  IF hi < lo THEN
+    binary_search = 0
+  ELSE
+    middle = (hi + lo) / 2
+    SELECT CASE value
+      CASE IS < array(middle)
+	binary_search = binary_search(array(), value, lo, middle-1)
+      CASE IS > array(middle)
+	binary_search = binary_search(array(), value, middle+1, hi)
+      CASE ELSE
+	binary_search = middle
+    END SELECT
+  END IF
+END FUNCTION

Task/Binary-search/BASIC/binary-search-2.bas

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+FUNCTION binary_search ( array() AS Integer, value AS Integer, lo AS Integer, hi AS Integer) AS Integer
+  DIM middle AS Integer
+
+  WHILE lo <= hi
+    middle = (hi + lo) / 2
+    SELECT CASE value
+      CASE IS < array(middle)
+	hi = middle - 1
+      CASE IS > array(middle)
+	lo = middle + 1
+      CASE ELSE
+	binary_search = middle
+	EXIT FUNCTION
+    END SELECT
+  WEND
+  binary_search = 0
+END FUNCTION

Task/Binary-search/BASIC/binary-search-3.bas

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+SUB search (array() AS Integer, value AS Integer)
+  DIM idx AS Integer
+
+  idx = binary_search(array(), value, LBOUND(array), UBOUND(array))
+  PRINT "Value "; value;
+  IF idx < 1 THEN
+    PRINT " not found"
+  ELSE
+    PRINT " found at index "; idx
+  END IF
+END SUB
+
+DIM test(1 TO 10) AS Integer
+DIM i AS Integer
+
+DATA 2, 3, 5, 6, 8, 10, 11, 15, 19, 20
+FOR i = 1 TO 10		' Fill the test array
+  READ test(i)
+NEXT i
+
+search test(), 4
+search test(), 8
+search test(), 20