432: Mainline

There are still other ways to define powerOf2 using a for loop. You can, for example, bring the reassignment of the result variable within the reassignment part of the for loop, joining it to the reassignment of the counter variable. The result is a for loop with an empty statement, which consists of a semicolon only, in place of an ordinary statement or block:

public class Demonstrate { 
 public static void main (String argv[]) { 
  System.out.println(powerOf2(4)); 
 } 
 public static int powerOf2 (int n) { 
  int result = 1;        
  for (int counter = n;                 // Initialization 
       counter != 0;                    // Test 
       --counter, result = result * 2)  // Reassignment 
    ;                                   // Empty statement 
  return result; 
}}