// bubble sort of 20 items

data[10], 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;
  }
}

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();
}