Why don't I get expected bubbleSort with some inputs like 9 8 7 6?

Question

When the bubbleSort runs, sometimes no values get displayed. It seems this occurs when values are entered in decending order.
https://code.sololearn.com/cyXN2S7817n0/?ref=app

Answer 1

You make an bad assumption: that "swapped" its false at last iteration thats not always true.
Try to remove if statement
if(swapped==false)