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PowerOfTwo.java

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class Solution {

public boolean isPowerOfTwo(int n) {

//edge case

if(n<=0)

return false;

// bitwise soln the bit representation of n and n-1 for power of two number will be always zero;

return (n & (n-1)) ==0;

}

}

//class Solution {

// public boolean isPowerOfTwo(int n) {

// return ((n & (n-1)) == 0 && n>0);

// }

// }

//Brtureforce soln

//class Solution {

// private int pow2(int i){

// return (int)Math.pow(2,i);

// }

// public boolean isPowerOfTwo(int n) {

// for(int i=0;i<32;i++){

// if(n==pow2(i))

// return true;

// if(pow2(i)>n+1)

// return false;

// }

// return false;

// }

// }