1 / 1

Understanding String and Set Expressions in Exercise

Learn what different expressions yield in the context of strings and sets, and test your knowledge by identifying set members in given strings.

yale
Télécharger la présentation

Understanding String and Set Expressions in Exercise

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Exercise 1 for strings and sets 1. What does each of the following expressions give? (a) a5 (b) |aba7b| (c) || (d) xR , where x = abab (e) AB, where A = {a, b, c}, B = {aaaa, bbbb, cccc}. (f) A*BA* ,where A and B are the same sets defined in (e) above. Answer: (a) aaaaa (b) 10 (c ) 0 (d) baba (e) AB = {aaaaa, abbbb, acccc, baaaa, bbbbb, bcccc, caaaa, cbbbb, ccccc} (f) A*BA* = { x | x = {a, b, c}* and x has aaaa, bbbb, or cccc as a substring} 2. For each of the following sets, which of the strings given below in (1) – (7) are its members? (a) {xyxR | x  {a, b, c}*, y  ccc } (b) {xx | x  {a, b, c}* } (c) {x | x  {a, b, c}* and x has more a’s than b’s. }  {aibj | j, i > 0 } (d) ({a, b, c}* - ({aibj | i > j > 0 }  {aibj | 0 < i < j }))  {aibj | j, i > 0 } (1) aaaabbbb (2) aaaa (3) aaaacccaaaa (4) bbbaaaa (5) abcccccba (6) aaaaab (7) abaaba Answer: (a): (3), (5) (b): (2), (7) (c): (6) (Notice that the members should be in {aibj | i > j > 0}) (d): (1) (Notice that the members should be in {aibi | i > 0 })

More Related