DRAND48 - obtain double precision random number.

(Compatible with UNIX System V C)


double drand48();
r = drand48();


double r;
is a pseudo-random number greater than or equal to 0.0 and strictly less than 1.0.


"drand48" returns a pseudo-random number in the range [0.0,1.0). The random generator used is the linear congruential algorithm and 48-bit integer arithmetic. Before the first call to "drand48", you should call "srand48" or "seed48" to initialize the random "seed".

See Also:

expl c lib seed48
expl c lib srand48
expl c lib erand48
expl c lib jrand48
expl c lib lrand48
expl c lib mrand48
expl c lib nrand48
expl c lib lcong48
expl c lib rand

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