Basic HTML version of Foils prepared March 30 97

Foil 8 Operators for Numbers and Strings I (Chapter 2 of Llama Book)

From PERL4 Tutorial for CPS616 Computational Science for Information Age Course CPS616 -- February 1995. by Geoffrey C. Fox
Convential arithmetic operators are available in PERL
  • +, -, =, /, ** (last is raise to power of) mean what you think
  • 2+3 # is 5
  • 10/3 is 3.33333 (and not 3) as numbers are floating point if necessary
One important string operator is . for concatenate
  • "Hello" . " World" is identical to "Hello World"
Less used is x (times) used to replicate string data
  • "hip " x 3 . "hurrah" # is "hip hip hip hurrah
  • Note that (3+2) x (3+1) # is NOT a number but rather the string "5555"

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