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Update prime_number.cpp #2902

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Update prime_number.cpp #2902

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18 changes: 17 additions & 1 deletion C++/prime_number.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -14,11 +14,27 @@ bool isPrime(int n)

return true;
}



bool isprimeMethod2(int n){
if (n <= 1) return false; // 0 and 1 are not prime numbers
if (n <= 3) return true; // 2 and 3 are prime numbers

// Check for even numbers and multiples of 3
if (n % 2 == 0 || n % 3 == 0) return false;

// Check from 5 to sqrt(n) for any factors
for (int i = 5; i * i <= n; i += 6) {
if (n % i == 0 || n % (i + 2) == 0) return false;
}

return true;
}

int main()
{
isPrime(11) ? cout << " true\n" : cout << " false\n";
isPrime(15) ? cout << " true\n" : cout << " false\n";
isprimeMethod2(15) ? cout << " true\n" : cout << " false\n";
return 0;
}