java - Binary to decimal, error message -



java - Binary to decimal, error message -

i wrote programme convert binary number decimal number. when run programme binary number, programme give me decimal number error message.

my code:

public class ohad { public static void main(string[] args) { string bin = "10011"; int length = bin.length(); int j = 0; int sum = 0; if (length != 0) { (int i=0; < bin.length(); i++){ if (bin.charat(i) == '0' || bin.charat(i) == '1'){ (int t = (length - 1); t >= 0; t--){ string s = bin.charat(j) + ""; sum = (int)(sum + (integer.valueof(s)) * (math.pow(2, t))); j++; } system.out.println(sum); } else { system.out.println("illegal input."); } } } else { system.out.println("illegal input."); } } }

error message:

exception in thread "main" java.lang.stringindexoutofboundsexception: string index out of range: 5 @ java.lang.string.charat(string.java:646) @ ohad.main(ohad.java:15)

i think it's j index. should do?

what should do?

i utilize integer.parseint(string,int) like

string bin = "10011"; system.out.println(integer.parseint(bin, 2));

output is

19

java for-loop binary decimal

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