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  1. or download this
    
    #!/usr/bin/perl -wl
...

    print $Config{intsize};
  2. or download this
    
    use POSIX;
...
    print POSIX::INT_MIN; 
    print POSIX::UINT_MAX;
  3. or download this
        print 0.5 * (-1 + unpack "I", pack "I", -1);
    print 0.5 * (-1 - unpack "I", pack "I", -1);
    print             unpack "I", pack "I", -1 ;