1. Programming Language Principles
Writing RPAL Programs
Programming Language Principles
Lecture 8
Prepared by
Manuel E. Bermúdez, Ph.D.
Associate Professor
University of Florida

2. Writing RPAL Programs
First, review RPAL's syntax

7. Let's Write a Few Programs
Factorial:
Bottom-up (classic)
Top down.
Top-down, counting from 1 to n,
Bottom-up, counting from 1 to n.
Palindrome (classic)
Add up numbers in a list.
Variation: find smallest one.

15. Let's Write a Few Programs (cont’d)
Remove repeated numbers from a tuple.
Create pairs of characters from two strings.
P('abc','def')=('ad', 'be', 'cf')
Inner product of two vectors: IP( (1,2,3), (1,2,3)) = 14

19. Let's Write a Few Programs (cont’d)
Pretty-print a tree.
Recursively build a string.
NOTE: parentheses required !
Variation 1: structure the program using 'lets'.
Variation 2: print the number of children for each node.

23. Programming Language Principles
Writing RPAL Programs
Programming Language Principles
Lecture 8
Prepared by
Manuel E. Bermúdez, Ph.D.
Associate Professor
University of Florida