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28 | `# -*- coding: utf-8 -*-`
`"""`
`Created on Thu Sep 15 23:41:45 2016`
`@author: Shruti`
`"""`
`#Iteration with while: using while, write a function which takes one argument,`
`#an integer n, and calculates the Hailstones sequence starting at n.`
`#If you don't know the Hailstones sequence:`
`#if hihi is even, then hi+1=hi/2hi+1=hi/2 ; but if hihi is odd,`
`#then hi+1=3hi+1hi+1=3hi+1 .`
`#The sequence will repeat when it reaches the subsequence 4, 2, 1, 4, …… ,`
`#so your loop should stop when it hits 1`
`import``math`
`def``hailstones(x):`
```while``x >``1``:`
```print``(``"%d"``%``x)`
```if``(x``%``2``=``=``0``):`
```x``=``x``/``2`
```print``(``"%d"``%``x)`
```elif``(x``%``2``!``=``0``):`
```x``=``3``*``x``+``1`
```print``(``"%d"``%``x)`
`hailstones(``15``)` |