need timo write method without any data structures or methods like getnumeric value ,parseint. however, we can use math fuctions like Math.pow or math.abs

/** Accepts an array of characters representing the bits in a twio's complement number * and returns the decimal equivalent. * precondition: * This method requires that the maximum length of the paranteter array is 16 . * Cparam theBits an array representing the bits in a two's complement number * ethrows IllegalAcgumentException if the length of the paraneter array >16. * / public static int convert2sCompToDecimal(final char[] theifits) f