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  1. #include <stdio.h>
  2. #include <math.h>
  3.  
  4. int isPrime(int n) {
  5. 	if (n == 1 || n == 2 || n == 3)
  6. 		return 1;
  7. 	if (n % 2 == 0 || n % 3 == 0)
  8. 		return 0;
  9. 	int sqrt_n = (int)sqrt((double)n);
  10. 	int k = -1;
  11. 	do {
  12. 		k += 6;
  13. 		if (n % k == 0 || n % (k + 2) == 0)
  14. 			break;
  15. 	} while (k < sqrt_n);
  16. 	return k > sqrt_n;
  17. }
  18.  
  19. int main() {
  20. 	int n,i;
  21. 	printf ("nhap so n: ");
  22. 	scanf ("%d",&n);
  23. 	printf ("cac thua so nto: ");
  24. 	for (i = 2; i <= n; i++) {
  25. 		while (n % i == 0) {
  26. 			if (isPrime(i)) {
  27. 				printf("\n%d", i);
  28. 				n /= i;
  29. 			}
  30. 		}
  31. 	}
  32. 	return 0;
  33. }
Success #stdin #stdout 0s 9424KB
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nhap so n: cac thua so nto: 
5
5
https://ideone.com/1MYccS
language:
C (gcc 8.3)
created:
6 years ago
visibility:
secret

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