Anonymous user
Run-length encoding: Difference between revisions
Added BBC BASIC
No edit summary |
(Added BBC BASIC) |
||
Line 320:
111r
rrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr
=={{header|BBC BASIC}}==
The run counts are indicated by means of character codes in the range 131 to 255.
<lang bbcbasic> input$ = "WWWWWWWWWWWWBWWWWWWWWWWWWBBBWWWWWWWWWWWWWWWWWWWWWWWWBWWWWWWWWWWWWWW"
PRINT "Input: " input$
rle$ = FNencodeRLE(input$)
output$ = FNdecodeRLE(rle$)
PRINT "Output: " output$
END
DEF FNencodeRLE(text$)
LOCAL n%, r%, c$, o$
n% = 1
WHILE n% <= LEN(text$)
c$ = MID$(text$, n%, 1)
n% += 1
r% = 1
WHILE c$ = MID$(text$, n%, 1) AND r% < 127
r% += 1
n% += 1
ENDWHILE
IF r% < 3 o$ += STRING$(r%, c$) ELSE o$ += CHR$(128+r%) + c$
ENDWHILE
= o$
DEF FNdecodeRLE(rle$)
LOCAL n%, c$, o$
n% = 1
WHILE n% <= LEN(rle$)
c$ = MID$(rle$, n%, 1)
n% += 1
IF ASC(c$) > 128 THEN
o$ += STRING$(ASC(c$)-128, MID$(rle$, n%, 1))
n% += 1
ELSE
o$ += c$
ENDIF
ENDWHILE
= o$</lang>
=={{header|C}}==
| |||