Generate a pseudo-random double
#include <stdlib.h> double drand48( void );
libc
Use the -l c option to qcc to link against this library. This library is usually included automatically.
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().
The erand48() function is a thread-safe version of drand48().
A pseudo-random double.
| Safety: | |
|---|---|
| Cancellation point | No |
| Interrupt handler | No |
| Signal handler | No |
| Thread | No |