# Thread: Converts a binary number to a decimal

1. Member Join Date
Jul 2007
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## Converts a binary number to a decimal

I need to write a method that converts a binary number to a decimal. Here is what i have so far any suggestions on how i can get this to work right now it returns 147.0 when you enter the binary number 11 which should have the decimal equivalent of 3.

Does anyone know where i messed up? I've been working on just this method for probably 8 hours including yesterday and today and i don't think I'm even close.

Java Code:
```static double toDecimal (String s)
{
int l = s.length();
double result = 0;

for (int i = 0; i < l; i++)
{
result = result + s.charAt(i) * Math.pow(2, (s.length() - i - 1));
}
return result;
}```
Thanks.  Reply With Quote

2. ## We only want to add the values of the bits that are turned on
and to ignore the zero/off bits.
Java Code:
```private static double toDecimal(String s) {
int l = s.length();
double result = 0;

for (int i = 0; i < l; i++) {
if(s.charAt(i) == '1')
result = result + Math.pow(2, (s.length() - i - 1));
}
return result;
}```  Reply With Quote

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