rtt-f030/examples/libc/rand.c

44 lines
782 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);