; Determines if a number is a power of two
.class public Power
.super java/lang/Object

.method public <init>()V
    aload_0

    invokespecial java/lang/Object/<init>()V
    return
.end method

.method public static main([Ljava/lang/String;)V
    .limit stack 2

    getstatic java/lang/System.out Ljava/io/PrintStream ; Load a PrintStream onto the stack

    ldc 256                         ; The number to check
    invokestatic Power/isPowerOfTwo(I)I         ; Check the number

    invokevirtual java/io/PrintStream/println(I)V       ; Output the result (0 = its a power of two)

    return
.end method

.method public static isPowerOfTwo(I)I
    .limit stack 2
    .limit locals 1

    iload_0     ; load the argument
    ldc 1       ; put "1" on the stack
    isub        ; subtract arg-1

    iload_0     ; load the argument again
    iand        ; bitwise and

    ireturn     ; return the result
.end method