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  1. #include <stdio.h>
  2. #include <time.h>
  3. #include <math.h>
  4.  
  5. int main(void) {
  6.     int count;
  7. 	int i;
  8. 	int j;
  9. 	int k;
  10. 	int c;
  11. 	int prime;
  12. 	clock_t start;
  13. 	clock_t end;
  14. 	double elapsed;
  15.  
  16. 	/* input */
  17. 	scanf("%d", &count);
  18.  
  19. 	/* measure time */
  20. 	start = clock();
  21. 	printf("2\n");
  22. 	c = 1;
  23. 	i = 3;
  24. 	while (c < count) {
  25. 		/* isPrime */
  26. 		j = (int)sqrt(i);
  27. 		k = 3;
  28. 		prime = 1;
  29. 		while (k <= j) {
  30. 			if (i % k == 0) {
  31. 				prime = 0;
  32. 				break;
  33. 			}
  34. 			k = k + 2;
  35. 		}
  36.  
  37. 		/* output */
  38. 		if (prime) {
  39. 			c = c + 1;
  40. 			printf("%d\n", i);
  41. 		}
  42.  
  43. 		i = i + 2;
  44. 	}
  45. 	end = clock();
  46.  
  47. 	elapsed = end - start;
  48. 	printf("elapsed time:%f\n", elapsed); 
  49.  
  50. 	return 0;
  51. }
Success #stdin #stdout 0.01s 1724KB
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elapsed time:0.000000
https://ideone.com/4opC1w
language:
C (gcc 8.3)
created:
11 years ago
visibility:
public

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