Why do most programming languages only return a single value from a function?(arstechnica.com)

  (let (x y) (f 12) ...)

  (multiple-value-bind (x y) (f 12) ...)

  sub f { 1..$_[0] }

  my ($x) = f(12);             # $x = first value, rest are dropped
  ...
  my ($x, $y) = f(12);         # $x & $y have first two values, rest are dropped
  ...  
  my ($x, $y, @rest) = f(12);  # $x=1, $y=2 & @rest=3..12

    int parsedInt;
    if(int.TryParse(s, out parsedInt))
    {
        Console.WriteLine("Parsed {0}",parsedInt);
    }
    else
    {
        Console.WriteLine("{0} was not an integer",s);
    }

    var parseSucceeded, parsedInt = int.TryParse(s);

    if(parseSucceeded)
    {
        Console.WriteLine("Parsed {0}",parsedInt);
    }
    else
    {
        Console.WriteLine("{0} was not an integer",s);
    }

    var parseTuple = int.TryParse(s);

    if(parseTuple.Item1)
    {
        Console.WriteLine("Parsed {0}",parseTuple.Item2);
    }
    else
    {
        Console.WriteLine("{0} was not an integer",s);
    }

    IntegerParseResult parseResult = int.TryParse(s); // Didn't use var here to clarify what this code means.

    if(parseResult.ParseSucceeded)
    {
        Console.WriteLine("Parsed {0}",parseTuple.ParsedInt);
    }
    else
    {
        Console.WriteLine("{0} was not an integer",s);
    }

  a,b = mod(x,n)

  L,U,P = lu(A)