Driver program
public static void main ( String [ ] args ) { int test_no = 64 ; if ( isPowerOfFour ( test_no ) == 1 ) System . out . println ( test_no + " ▁ is ▁ a ▁ power ▁ of ▁ 4" ) ; else System . out . println ( test_no + " is ▁ not ▁ a ▁ power ▁ of ▁ 4" ) ; } }