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  1. #include <iostream>
  2. #include <math.h>
  3. using namespace std;
  4.  
  5. string primeCheck(unsigned long long n)
  6. {
  7. 	if(n==2)
  8. 		return "is prime";
  9.  
  10. 	for(int i=2; i<sqrt(n); i++)
  11. 	{
  12. 		if(n%i==0)
  13. 			return "not prime";
  14. 	}
  15.  
  16. 	return "prime";
  17. }
  18.  
  19. int main() {
  20.  
  21. 	unsigned long long n;
  22. 	cin>>n;
  23. 	cout<<primeCheck(n);
  24. 	return 0;
  25. }
Success #stdin #stdout 0s 3476KB
comments (?)
stdin
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12345678987654321
stdout
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not prime
https://ideone.com/oq1OuH
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
public

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