// bubble sort 

data[20], maxdata

init()
  i = 0
  while(i < maxdata)
    data[i] = maxdata - i 
    i = i+1

show()
  i = 0
  while(i < maxdata) 
    print(data[i]," ")
    i = i+1 
  print("\n")

swap(a,b) 
  t = data[a]
  data[a] = data[b] 
  data[b] = t


sort()
  i = 0
  while(i < maxdata)
    j = 0
    while(j < maxdata-1)
      if(data[j+1] < data[j]) swap(j,j+1)
      j = j+1
    i = i+1

main()
  maxdata = 20
  init()
  show()
  sort()
  show()