Question

# Please answer in 15 minutes   The goal of the method ...

The goal of the method binaryToDecimal here is to convert a binary number into a decimal. It receives a java LinkedList of Strings where each of its elements represents one of the digits (0 or 1) that form the number.

Binary numbers follow a positional schema where each digit represents if a power of two needs to be added to form the decimal number. Starting from right to left, the first digit represents 2^0, the second digit 2^1, the third 2^2, and so on. For example, the number 0110 represents the number 6 because:

0110 = 0*(2^3) + 1*(2^2) + 1*(2^1) + 0*(2^0)

The code shown below needs to be able to handle the case where one or more of the Strings within the array cannot be converted into a number. In case that exception is triggered, it needs to return -1 and print the message "One or more of the digits could not be converted into an integer".

You need to identify the wrong lines (by using the number of the line) and propose a new line that fixes it and, at the same time, you need to explain why are you fixing each of those lines of code.

E.g.

Line x) The error in this line is that _______, I would fix it with the following line _______ . I propose this fix because _____________

Examples of execution:

binaryToDecimal({0,1,1,1}) -> 7

binaryToDecimal({1,0,0,0,0}) -> 16

Hint: five lines present errors in this case (one error per line).

Code given to start:

1 public static int binaryToDecimal(LinkedList<String> binaryDigits) {
2   try {
3      int convertedInteger = 1;
4      int maxExponent = binaryDigits.length;
5      for(int i=0;i<=maxExponent;i++) {
6          String binaryDigitAsString = binaryDigits[i];
7          int binaryDigit = Integer.parseInt(binaryDigitAsString);
8          if(binaryDigit==1) {
9             convertedInteger+=Math.pow(2,i);
10          }
11      }
12      return convertedInteger;
13   }catch(IOException e){
14      System.out.println("One or more of the digits could not be converted into an integer");
15      return -1;
16   }
17}

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