acr_test/examples/libc/rand.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);