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  1. #include <stdio.h>
  2.  
  3. int main(void) {
  4. 	int n;
  5. 	printf("Enter a number: \n");
  6. 	scanf("%d", &n);
  7.  
  8.  	int cnt = 0;
  9. 	for(int i=1; i<=n; i++) {
  10. 		if(n%i == 0)
  11. 			cnt++;
  12. 	}
  13. 	if(cnt == 2)
  14. 		printf("%d is a prime number.\n", n);
  15. 	else
  16. 		printf("%d is not a prime number.\n", n);
  17.  
  18. 	int total = 0;
  19. 	for(int i=1; i<10000; i++) {
  20. 		int cnt1 = 0;
  21. 		for(int j=1; j<=i; j++) {
  22. 			if(i%j == 0)
  23. 				cnt1++;
  24. 		}
  25. 		if(cnt1 == 2)
  26. 			total++;
  27. 	}
  28.  
  29. 	printf("Number of prime numbers < 10000 = %d", total);
  30.  
  31. 	return 0;
  32. }
  33.  
Success #stdin #stdout 0.18s 10304KB
comments (?)
stdin
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22
stdout
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Enter a number: 
22 is not a prime number.
Number of prime numbers < 10000 = 1229
https://ideone.com/1xMOmY
language:
C99 (gcc 8.3)
created:
6 years ago
visibility:
public

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