Initial data commit

Task/Sorting-algorithms-Merge-sort/BBC-BASIC/sorting-algorithms-merge-sort-1.basic

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+DEFPROC_MergeSort(Start%,End%)
+REM *****************************************************************
+REM This procedure Merge Sorts the chunk of data% bounded by
+REM Start% & End%.
+REM *****************************************************************
+
+LOCAL Middle%
+IF End%=Start% ENDPROC
+
+IF End%-Start%=1 THEN
+   IF data%(End%)<data%(Start%) THEN
+      SWAP data%(Start%),data%(End%)
+   ENDIF
+   ENDPROC
+ENDIF
+
+Middle%=Start%+(End%-Start%)/2
+
+PROC_MergeSort(Start%,Middle%)
+PROC_MergeSort(Middle%+1,End%)
+PROC_Merge(Start%,Middle%,End%)
+
+ENDPROC
+:
+DEF PROC_Merge(Start%,Middle%,End%)
+
+LOCAL fh_size%
+fh_size% = Middle%-Start%+1
+
+FOR I%=0 TO fh_size%-1
+  fh%(I%)=data%(Start%+I%)
+NEXT I%
+
+I%=0
+J%=Middle%+1
+K%=Start%
+
+REPEAT
+  IF fh%(I%) <= data%(J%) THEN
+    data%(K%)=fh%(I%)
+    I%+=1
+    K%+=1
+  ELSE
+    data%(K%)=data%(J%)
+    J%+=1
+    K%+=1
+  ENDIF
+UNTIL I%=fh_size% OR J%>End%
+
+WHILE I% < fh_size%
+  data%(K%)=fh%(I%)
+  I%+=1
+  K%+=1
+ENDWHILE
+
+ENDPROC

Task/Sorting-algorithms-Merge-sort/BBC-BASIC/sorting-algorithms-merge-sort-2.basic

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+REM Example of merge sort usage.
+Size%=1000
+
+S1%=Size%/2
+
+DIM data%(Size%)
+DIM fh%(S1%)
+
+FOR I%=1 TO Size%
+  data%(I%)=RND(100000)
+NEXT
+
+PROC_MergeSort(1,Size%)
+
+END