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add example which used floating point numbers

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Stefan Lankes 2011-10-07 16:03:11 +02:00
parent 0801b6f087
commit 4f237a9069
1 changed files with 26 additions and 0 deletions
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26
apps/tests.c
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@ -274,6 +274,31 @@ static int join_test(void* arg)
return 0;
}
#ifndef M_PI
#define M_PI 3.14159265358979323846264338327950288 /* pi */
#endif
static int pi(void* arg)
{
double x, sum, step;
int i, num_steps = 100000000;
sum = 0.0;
step = 1.0 / (double)num_steps;
for (i = 0; i < num_steps; i++) {
x = (i + 0.5) * step;
sum += 4.0 / (1.0 + x * x);
}
x = M_PI - sum * step;
x *= 10000.0;
kprintf("Distance to PI = %u/10000\n", (uint32_t) x);
return 0;
}
int test_init(void)
{
// char* argv[] = {"/bin/mshell", NULL};
@ -292,6 +317,7 @@ int test_init(void)
//create_kernel_task(NULL, mail_ping, NULL, NORMAL_PRIO);
//create_kernel_task(NULL, mail_noise, NULL, NORMAL_PRIO);
//create_kernel_task(NULL, svm_test, NULL, NORMAL_PRIO);
//create_kernel_task(NULL, pi, NULL, NORMAL_PRIO);
//create_user_task(NULL, "/bin/hello", argv);
create_user_task(NULL, "/bin/tests", argv);
//create_user_task(NULL, "/bin/jacobi", argv);