Generates uniformly distributed pseudorandom-number sequences.
    Returns 48-bit signed long integers.

    Format

      #include  <stdlib.h>

      long int lrand48  (void);

1  –  Description

    The lrand48 function generates pseudorandom numbers using the
    linear congruential algorithm and 48-bit integer arithmetic.

    It returns nonnegative, long integers uniformly distributed over
    the range of y values such that 0 

    Before you call the lrand48 function use either srand48, seed48,
    or lcong48 to initialize the random-number generator. You must
    initialize prior to invoking the lrand48 function, because it
    stores the last 48-bit Xi generated into an internal buffer.
    (Although it is not recommended, constant default initializer
    values are supplied automatically if the drand48, lrand48,
    or mrand48 functions are called without first calling an
    initialization function.)

    The function works by generating a sequence of 48-bit integer
    values, Xi, according to the linear congruential formula:

           Xn+1 = (aXn+c)mod m        n >= 0

    The argument m equals 248, so 48-bit integer arithmetic is

    performed. Unless you invoke the lcong48 function, the multiplier
    value a and the addend value c are:

          a = 5DEECE66D16 = 2736731631558

          c = B16 = 138

    The value returned by the lrand48 function is computed by
    first generating the next 48-bit Xi in the sequence. Then the
    appropriate bits, according to the type of data item to be
    returned, are copied from the high-order (most significant) bits
    of Xi and transformed into the returned value.

    See also drand48, lcong48, mrand48, seed48, and srand48.

2  –  Return Value

    n                  Signed nonnegative long integers uniformly
                       distributed over the range 0