Oct 15th, 2017
29
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1. #include <stdio.h>
2. #include <stdlib.h>
3. #include <time.h>
4. #include <math.h>
5. #include <stddef.h>
6.
7. float randomazer (float max, float min){ //random numbers from min to max
8.     float random;
9.     int i; //because time og program near 1 sec random number isnt differnt
10.     i=rand(); //i always be same random numbers if dont add srand
11.     srand(time(NULL)+i);
12.     random = rand();
13.     random = (random / RAND_MAX)*(max-min)+min;
14.     return(random);
15. }
16.
17. int crossed (float y, float j, float si, float t, float l){
18.     j= (int)j;
19.     l= (int)l;
20.     t= (int)t;
21.     if (y<(t+t*j) && y>=j*t && ((si * l/2 + y >= t+t*j) || (-si * l/2 + y <= j*t)))
22.         return 1;
23.     else
24.         return 0;
25. }
26.
27. int main (void){
28.     float max, min, ratio, pi, p;
29.     int width, i=0, j, g, high, t, l, n, count_crossed=0; //count_crossed - quantity of crossed needles
30.     scanf ("%d" "%d" "%d" "%d" "%d", &width, &high, &t, &l, &n);
31.     float x [n+1]; //location of center of each needl
32.     float y [n+1];
33.     float alpha [n+1];
34.     float si [n+1]; //array of sin of alpha
35.
36.     for (i=0 ; i<n ; i++){
37.         max=width;
38.         x [i] = randomazer (max, 0);
39.     //  printf ("%f  ", x [i]);
40.
41.         max=high;
42.         y [i] = randomazer (max, 0);
43.     //  printf ("%f  ", y [i]);
44.
45.         alpha [i] = randomazer (3.14, 0);
46.     //  printf ("%f\n", alpha [i]);
47.         si [i] = sin (alpha [i]);
48.
49.         for (j=0; j<high/t; j++){  //for every section
50.         count_crossed+=crossed (y[i], j, si [i], t, l);
51.         }
52.     //  printf ("%d\n", count_crossed);
53.     }
54.
55.     printf("Crossed lines : ");
56.     printf("%d\n", count_crossed);
57.
58.     printf("Between lines : ");
59.     printf("%d\n", n-count_crossed);
60.
61.     ratio=(float)count_crossed/(n-count_crossed);
62.     printf("Ratio : ");
63.     printf("%f\n", ratio);
64.
65.     p= (float)count_crossed/n;
66.     pi= 2 * (float)l / (t*p);
67.     printf("PI : ");
68.     printf("%f\n", pi);
69.
70.     return 0;
71. }
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