drand48()

Generate a pseudo-random double integer

Synopsis:

#include <stdlib.h>

double drand48( void );

Library:

libc

Description:

The drand48() function uses a linear congruential algorithm and 48-bit integer arithmetic to generate a nonnegative double uniformly distributed over the interval [0.0, 1.0].

Call one of lcong48(), seed48(), or srand48() to initialize the random-number generator before calling drand48(), lrand48(), or mrand48().

Returns:

A pseudo-random double.

Classification:

Standard Unix

Safety:
Cancellation point	No
Interrupt handler	No
Signal handler	No
Thread	No