Answered: Write a Prolog predicate…

Computer Networking: A Top-Down Approach (7th Edition)

7th Edition

ISBN:9780133594140

Author:James Kurose, Keith Ross

Publisher:James Kurose, Keith Ross

Chapter1: Computer Networks And The Internet

Section: Chapter Questions

Problem R1RQ: What is the difference between a host and an end system? List several different types of end...

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Question-2

Write a Prolog predicate "encode(String, Key, Encode)" that encodes a given string to a cypher code using a key.
The encode/3 predicate has three arguments
1. String - The given string which is to be encoded (Input character range 'a' to 'z')
2. Key - A number used for encoding
3. Encode - The cypher code generated

The cypher code for any character is the sum of the ASCII value of that character and the key, but the resultant cypher code must be in the range of 'a' to 'z'.

Resources:
1. atom_codes(Atom, CodeList)
Convert between an atom and a list of corresponding ASCII codes.
2. char_code(Atom, Code)
Convert between a single character (an atom of length 1), and its ASCII character code.

Sample Query:
?- encode(apple, 10, E).
?- encode(zoo, 10, E).

Sample Output:
E = kzzvo
E = jyy

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