The lcong48 function generates pseudorandom numbers using the
    linear congruential algorithm and 48-bit integer arithmetic.

    You can use lcong48 to initialize the random number generator
    before you call any of the following functions:

       drand48
       lrand48
       mrand48

    The lcong48 function specifies the initial Xi value, the
    multiplier value a, and the addend value c. The param array
    elements specify the following:

    param[0-   Xi
    2]
    param[3-   Multiplier a value
    5]
    param[6]   16-bit addend c value

    After lcong48 has been called, a subsequent call to either
    srand48 or seed48 restores the standard a and c as specified
    previously.

    The lcong48 function does not return a value.

    See also drand48, lrand48, mrand48, srand48, and seed48.