Basic HTML version of Foils prepared Sept 20 97

Foil 15 Logical Operators

From Tutorial on PERL Computational Science for Information Age Course CPS616 -- Sept 20 97. by Geoffrey C. Fox,Nancy McCracken,Tom Scavo


1 Logical and: && as in $x && $y;
2 If $x is true, evaluate $y and return $y
3 If $x is false, don't eval $y and return false
4 Logical or: || as in $x || $y;
5 If $x is true, don't evaluate $y and return true
6 If $x is false, evaluate $y and return $y
7 Logical Not: ! as in ! $x;
8 Return not $x
9 and is same as &&, or the same as || and not is same as ! but lower (indeed lowest) precedence (see Table 2-3 in Llama Book)

in Table To:


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