How to convert signed ascii hex to float value

Question

Hi,
I have a requirement to convert IEEE ascii hex to float value.
Following code is working for +ve float value but it didn't work for -ve.
public static float hexToFloat(String str){
          float floatVal= 0.0f;
          int decimalValue =Integer.parseInt(str,16);
          floatVal=Float.intBitsToFloat(decimalValue );
          return floatVal;
for example "BE4CE1E6" should return -0.20 . (i verified in http://babbage.cs.qc.edu/IEEE-754/32bit.html )
For the above string I am getting number format exception.
pls help me.

Answer 1

The problem is the parseInt method. It can only process numbers up to 2147483647 or 7FFFFFFF. Because that method expects a signed number.
The solution is to use Long.parseLong() instead.
public static float hexToFloat(String str){
float floatVal= 0.0f;
int decimalValue =(int)Long.parseLong(str,16);
floatVal=Float.intBitsToFloat(decimalValue );
return floatVal;
}