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return output;
}</lang>
=={{header|Liberty BASIC}}==
<lang lb>mainwin 100 20
'In$ ="aaaaaaaaaaaaaaaaaccbbbbbbbbbbbbbbba" ' testing...
In$ ="WWWWWWWWWWWWBWWWWWWWWWWWWBBBWWWWWWWWWWWWWWWWWWWWWWWWBWWWWWWWWWWWWWW"
' Out$= "12W1B12W3B24W1B14W"
Out$ =Encoded$( In$)
Inv$ =Decoded$( Out$)
print " Supplied string ="; In$
Print " RLE version ="; Out$
print " Decoded back to ="; Inv$
end
function Encoded$( k$)
r$ =""
r =1
for i =2 to len( k$)
prev$ =mid$( k$, i -1, 1)
c$ =mid$( k$, i, 1)
if c$ =prev$ then ' entering a run of this character
r =r +1
else ' it occurred only once
r$ =r$ +str$( r) +prev$
r =1
end if
next i
r$ =r$ +str$( r) +c$
Encoded$ =r$
end function
function Decoded$( k$)
r$ =""
v =0
for i =1 to len( k$)
i$ =mid$( k$, i, 1)
if instr( "0123456789", i$) then
v =v *10 +val( i$)
else
for m =1 to v
r$ =r$ +i$
next m
v =0
end if
next i
Decoded$ =r$
end function</lang>
=={{header|Logo}}==
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