Your print could be written more succinctly as 
print "$av$cv$bv = \n";

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For delimiters that interpolate like double quotes, blackslashed characters are converted to the appropriate whitespace or control character and scalars ($) and arrays (@) are converted to their contents as strings. See Quote and Quote like Operators in perlop for detail.

#11929 First ask yourself `How would I do this without a computer?' Then have the computer do it the same way.

In reply to Re^3: cv = (irand(2))?"+":"-"; by kennethk
in thread cv = (irand(2))?"+":"-"; by monorels

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