diff options
Diffstat (limited to 'main_1.c')
-rw-r--r-- | main_1.c | 89 |
1 files changed, 0 insertions, 89 deletions
diff --git a/main_1.c b/main_1.c deleted file mode 100644 index cd84b67..0000000 --- a/main_1.c +++ /dev/null @@ -1,89 +0,0 @@ -#include <stdio.h> - -#if defined(PROG_SINUS_SUM) - -#define EPSILON 0.001*0.001 -#define MAX_ITERATIONS 100 - -int main(void) { - puts("defined macro PROG_SINUS_SUM"); - double x; - double result; - double last_elem; - int i; - - printf("Input a number\n"); - scanf("%lf", &x); - last_elem = result = x; - - for (i = 1; i < MAX_ITERATIONS; ++i) { - last_elem = last_elem * x * x / (2*i * (2*i+1)); - if (last_elem*last_elem <= EPSILON) break; - result += last_elem * ( (i%2 * -2) + 1 ); - } - printf("result = %lf; iterations = %i; last_elem = %lf\n", result, i, last_elem); - return 0; -} - -#elif defined(PROG_MONTE_CARLO) - -#include <stdlib.h> -#include <time.h> - -#define _USE_MATH_DEFINES -#include <math.h> - -struct point { - float x, y; -}; - -struct circle { - // center not needed for this task - /*struct point center;*/ - float rad; -}; - -char in_circle(const struct circle *c, const struct point p) { - /*p.x -= c->x;*/ - /*p.y -= c->y;*/ - return p.x * p.x + p.y * p.y < c->rad*c->rad; -} - -float calculate_pi(int iterations) { - int in = 0, out = 0; - int *arr[2] = {&out, &in}; - const struct circle c = {.rad = 1.0f}; - for (int i = 0; i < iterations; ++i) { - struct point p = { - .x = rand() % 2000000u / 1e6f - 1, - .y = rand() % 2000000u / 1e6f - 1 - }; - ++*arr[in_circle(&c, p)]; - } - return (float)in/iterations * 4; -} - -int main(int argc, char *argv[]) { - puts("defined macro PROG_MONTE_CARLO"); - srand(time(NULL)); - int iters; - if (argc == 2) { - iters = atoi(argv[1]); - } else { - fputs("Iterations: ", stdout); - if (!scanf("%i", &iters)) { - fputs("Input a valid number\n", stderr); - return EXIT_FAILURE; - } - } - float pi = calculate_pi(iters); - float err = fabs(M_PI-pi)/M_PI; - printf( "calculated pi: %.4f, actual pi: %.4f\n" - "error: %.2f%%\n", - pi, M_PI, err * 100); - return EXIT_SUCCESS; -} - -#else - #error "define macro PROG_SINUS_SUM or PROG_MONTE_CARLO in compilation flags" -#endif |