some operation on buffer should be implemented

Created by: mbonani

all implementations are fine but not the two commented, they should be

var k=0 var l=1 var buff[3]=1,2,3

buff[k+l+1]=22 k++ buff[k+l]=33 call math.fill(buff[1:2],2)

buff[1:2]=2,2

buff[1]++ buff[k+1]=buff[k+1]+1

buff[k+1]++