Perlにおけるtrueとfalseの徹底研究

0 # will convert to the string "0", so false 
1 # Will convert to the string "1", so true 
100 - 100 # 100-100 equals 0, which will be converted to the string "0", so false 
0.00 # equal to 0, which will convert to the string "0", so false 
"0" # string "0", so false 
"" # This is the empty string, so it is false 
"0.00" # That is, it is not "" and it is not "0", so it is true 
"0.00" + 0 # Forced conversion by +, the result of the calculation is 0, so it is false 
\$a # A reference to the scalar $a, so true, even if $a is false. 
undef() # is a function that returns an undefined value, so it is false