Smallest power of 4 greater than or equal to N | Java implementation of above approach ; Function to return the smallest power of 4 greater than or equal to n ; If n is itself is a power of 4 then return n ; Driver code
import java . util . * ; import java . lang . Math ; import java . io . * ; class GFG { static int nextPowerOfFour ( int n ) { int x = ( int ) Math . floor ( Math . sqrt ( Math . sqrt ( n ) ) ) ; if ( Math . pow ( x , 4 ) == n ) return n ; else { x = x + 1 ; return ( int ) Math . pow ( x , 4 ) ; } } public static void main ( String [ ] args ) throws java . lang . Exception { int n = 122 ; System . out . println ( nextPowerOfFour ( n ) ) ; } }