and, or, &&, ||

Hello! I remember someone mentioning that there may be a precedence problem with "unexpected results" during a mathematical conditional test, using the keywords "and" and "or"...instead of the symbols (&& and ||). Is this true? Can anyone give me an example? Thanks much! cl _

Printing Multi-dimensional Hash

hello! Trying to print out the following multi-dimensional hash: %classes=( "Math" => { "Joan" => 95, "John" => 70, "Jane" => 50 }, "Science" => { "Joan" => 80, "John" => 90, "Jane" => 80 }, );