java - Unable to obtain the correct product of numbers when used with Math.pow() -


i trying write recursive function gets string , returns integer form of it. know can done in java using integer.parseint. part of exercise doing.

for following code, when enter "963" input, returns output "6291". so, checked if array getting passed , was.

to check multiplication, split , printed product each time, gave 5700, 540 , 51, correctly sum 6291. (which should have been 900 + 60 + 3 = 963). i'm unable figure out wrong in program. 

import java.io.*; import java.lang.*; class recconvert {     static double i=0;     static double sum=0;     public static void main(string[] args) throws ioexception     {         bufferedreader b = new bufferedreader(new inputstreamreader(system.in));         string input = b.readline();         int number = recursiveconvert(input);         system.out.println("the number "+number);     }      static int recursiveconvert(string input)     {         char[] chararray = input.tochararray();         if(i < chararray.length)             {                 sum = sum + (chararray[(int)i]) * ( (double)math.pow(10.0,chararray.length-i-1) );                 i++;                 return recursiveconvert(input);             }         else             return (int)sum;     } }

this problem (chararray[(int)i]). you're multiplying char double. character.getnumericvalue(chararray[(int)i]) solve it.


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