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Thread: isPrime Boolean Method returns true for squares of primes

  1. September 29th, 2011, 11:46 PM #1
    Staticity
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    Default isPrime Boolean Method returns true for squares of primes 

    	public boolean isPrime(int x){
		if(x % 2 == 0 && x > 2)
			return false;
		if(x <= 1){
			return false;
		}
		if(x == 2){
			return true;
		}
 
		for(long i = 3; i < Math.sqrt(x); i+=2){
			if(x % i == 0)
				return false;
		}
 
 
		return true;

    If I pass through any integer that's a square of a prime number.. It returns with true. So...

    Input: 25
    Output: "Prime: True"

    Input: 49
    Output: "Prime: True"

    SOLVED: Sorry guys... I just solved it.. Within the For Loop, I never checked for the square root of "x".. So the odd squares would return true..
    Last edited by Staticity; September 29th, 2011 at 11:50 PM. Reason: Solved Issue
    Simplicity calls for Complexity. Think about it.
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