mirror of
https://github.com/RT-Thread/rt-thread.git
synced 2025-01-16 07:49:30 +08:00
d9cb84f484
git-svn-id: https://rt-thread.googlecode.com/svn/trunk@1061 bbd45198-f89e-11dd-88c7-29a3b14d5316
44 lines
825 B
C
44 lines
825 B
C
/*
|
|
* rand.c
|
|
*
|
|
* Created on: 2010-11-17
|
|
* Author: bernard
|
|
*/
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <finsh.h>
|
|
|
|
int libc_rand(void)
|
|
{
|
|
int i1, i2;
|
|
int j1, j2;
|
|
|
|
/* The C standard says that "If rand is called before any calls to
|
|
srand have been made, the same sequence shall be generated as
|
|
when srand is first called with a seed value of 1." */
|
|
i1 = rand();
|
|
i2 = rand();
|
|
srand(1);
|
|
j1 = rand();
|
|
j2 = rand();
|
|
if (i1 < 0 || i2 < 0 || j1 < 0 || j2 < 0)
|
|
{
|
|
puts("Test FAILED!");
|
|
}
|
|
if (j1 == i1 && j2 == i2)
|
|
{
|
|
puts("Test succeeded.");
|
|
return 0;
|
|
}
|
|
else
|
|
{
|
|
if (j1 != i1)
|
|
printf("%d != %d\n", j1, i1);
|
|
if (j2 != i2)
|
|
printf("%d != %d\n", j2, i2);
|
|
puts("Test FAILED!");
|
|
return 1;
|
|
}
|
|
}
|
|
FINSH_FUNCTION_EXPORT(libc_rand, rand test for libc);
|