Write a method that will convert the supplied binary digit (as a string) to a decimal number

Question

The aim of this method is to convert the supplied binary digit (as a string) to a decimal number, but I am not getting the result the question wants with the code I have for example convertToDecimal("01101011") = 107 , and I'm am unsure I believe im converting the binary to decimal number right. for example:

Test

System.out.println(convertToDecimal("11001101")); = 205 

ive tried a while loop and creating ints but it's just not giving me the same results

public static int binaryToDecimal(String binary) {
     int decimal = 0;
     int power = 0;
     int currentIndex = binary.length() - 1;
     while (currentIndex>=0) {
         int currentDigit = binary.charAt(currentIndex) - '0';  
         decimal += currentDigit * Math.pow(2, power);
         power++;
         currentIndex--;
     }
     return decimal;
 }

I expected to the output to be:

convertToDecimal("01101011") = 107 
convertToDecimal("00001011") = 11    ,  
System.out.println(convertToDecimal("11001101")); = 205 

but none were right

Answer 1

I ran your code, and it worked. But I need to make one simple change:

System.out.println(convertToDecimal("11001101")); = 205 

must be changed to:

System.out.println(binaryToDecimal("11001101")); = 205 

because binaryToDecimal() is the actual name of your function:

public static int binaryToDecimal(String binary) {
     int decimal = 0;
     int power = 0;
     int currentIndex = binary.length() - 1;
     while (currentIndex>=0) {
         int currentDigit = binary.charAt(currentIndex) - '0';  
         decimal += currentDigit * Math.pow(2, power);
         power++;
         currentIndex--;
     }
     return decimal;
 }

After that, it all works fine.