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- /**
- * Requires math.h
- * Returns 1 if num is prime else returns 0.
- */
- int is_prime(int num) {
- if (num <= 2) return 0;
- if (num == 2) return 1;
- if (num%2 == 0) return 0;
- for (int i=3; i<=sqrt(num); i+=2) {
- if (num%i == 0) return 0;
- }
- return 1;
- }
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