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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <time.h>
  4. #define LOOP	(1000000)
  5. int Gacha(double atari, int tenjo) {
  6. 	int	i,iatari;
  7. 	iatari = RAND_MAX * (atari/100.0);
  8. 	for (i=0 ; i<tenjo ; i++) {
  9. 		if (rand()<=iatari)	break;
  10. 	}
  11. 	return i;
  12. }
  13. int main(void) {
  14. 	int i;
  15. 	double ave;
  16. 	time_t t;
  17. 	time(&t); srand(t);
  18. 	printf("seed: %d  ,  LOOP: %d\n",t,LOOP);
  19.  
  20. 	/* 0.6% , 天井90回 */
  21. 	for (i=0,ave=0.0 ; i<LOOP ; i++) {
  22. 		ave += (double)Gacha(0.6, 90);
  23. 	}
  24. 	ave /= (double)LOOP;
  25. 	printf("ave: %.3f  ,  1/ave*100: %.3f\n", ave, 1.0/ave*100.0);
  26.  
  27. 	/* 1.6% , 天井無し */
  28. 	for (i=0,ave=0.0 ; i<LOOP ; i++) {
  29. 		ave += (double)Gacha(1.6, 999999999);
  30. 	}
  31. 	ave /= (double)LOOP;
  32. 	printf("ave: %.3f  ,  1/ave*100: %.3f\n", ave, 1.0/ave*100.0);
  33. 	return 0;
  34. }
  35.  
Success #stdin #stdout 1.91s 4680KB
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stdin
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Standard input is empty
stdout
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seed: 1616761300  ,  LOOP: 1000000
ave: 69.286  ,  1/ave*100: 1.443
ave: 61.634  ,  1/ave*100: 1.622
https://ideone.com/zoH33F
language:
C (gcc 8.3)
created:
3 years ago
visibility:
public

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