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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.
POSIX 1003.1 XSI
Safety: | |
Cancellation point |
No |
Interrupt handler |
No |
Signal handler |
No |
Thread |
No |
erand48(),
jrand48(),
lcong48(),
lrand48(),
mrand48(),
nrand48(),
seed48(),
srand48()
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