231. Power of 2 | Power of

Given an integer, write a function to determine if it is a power of.

Credits:
Special thanks to @jianchao. Li.fighter for adding the problem and creating all test cases.

Given an integer, write a function to determine whether it is a power of 2.

Example 1:

Input: 1 output: true explanation: 20 = 1

Example 2:

Input: 16 Output: true explanation: 24 = 16

Example 3:

Input: 218 Output: false

24ms

1 classSolution {2Func Ispoweroftwo (_ N:int)Bool {3         ifN <1{return false}4         varNum:int =N5          while(num! =1)6         {7             ifnum%2==1{return false}8             Else{num/=2}9         }Ten         return true One     } A}

24ms

1 classSolution {2Func Ispoweroftwo (_ N:int)Bool {3Guard n >0 Else{return false }4         ifn = =1{return true }5         varnum =26          whileNum <N {7Num *=28         }9         returnnum = =NTen     } One}

1 classSolution {2Func Ispoweroftwo (_ N:int)Bool {3Guard n >0 Else{return false }4         ifn = =1{return true }5         varnum =26          whileNum <N {7Num *=28         }9         returnnum = =NTen     } One}

20ms

1 classSolution {2Func Ispoweroftwo (_ N:int)Bool {3         ifn = =1 {4             return true5         }6         7         varX:int =28          while(x <=N)9         {Ten             ifx = =N { One                 return true A             } -              -X *=2 the         } -         return false -     } -}

20ms

1 class Solution {2     func ispoweroftwo (_ N:int), Bool {3         //  Power of 1 '4         return15    } means  6 }

231. Power of 2 | Power of