eval() is part of the standard distribution of PERL.
If you wanted to allow the program to keep running until the user exits you could use something like this:
#!/usr/bin/perl
$| = 1;
while( ) {
print "Number, plz: ";
$input = <>;
chomp $input;
print "\nOutput is: ", ( ($input*2)-1 ), "\n";
}
That seemed to work on my system.
If you make something idiot-proof, eventually someone will make a better idiot.
I am that better idiot.
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