perl -we "$x='7LanX'; print (3^$x);"
Argument "7LanX" isn't numeric in bitwise xor (^) at -e line 1.
4
perl -we "$x='7LanX'; print ($x*3);"
Argument "7LanX" isn't numeric in multiplication (*) at -e line 1.
21
perl -we "$x='7LanX'; print (3**$x);"
Argument "7LanX" isn't numeric in exponentiation (**) at -e line 1.
2187