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역링크 › MoniWikiPlugins › SubscribePlugin › CProgramming › AliasPageNamesDefaultKo › isPrime
int isPrime(int num) { if ( num <= 1 ) { return 0; } if ( num <= 3 ) { return 1; } if ( (num & 0x1) == 0 ) { return 0; } int end = sqrt(num); for (register int i = 3; i <= end; ++i ) { if ( end % i ) return 0; } return 1; }