Need help squashing a simple bug (b=a+b);

[RainColt]

I just started school and I'm having trouble with a program the loop works as intended except b=b+a;

It was my belief that b=b+a; would add the value of "a" to "b" and as the program loops "b" would store the grand total of every "a" value  calculated, but instead "b" ends up always equal to "a"

 

 

Scanner UserInput = new Scanner(System.in);
        int input = UserInput.nextInt();                     //input ==1234
        int length = String.valueOf(input).length();//length ==4
        
        while (length>0)
        {    
        length--;    
        int a = (int)( input/(Math.pow(10, length)));// a==1,a==2,a==3,a==4
        int b = 0;
        b=b+a;                                                    //b should ==10    by the end of the loop 1+2+3+4
        System.out.println("b Sum =" + b);         //these 3 lines are just for debugging
        System.out.println ("a =" + a);
        System.out.println ("length" +length);
        input = (int)(input - (Math.pow(10,length)) * a);
        }

[Fasauceome]

What language is this? Have you tried b+=a?

[RainColt]

3 minutes ago, Fasauceome said:

What language is this? Have you tried b+=a?

Its java, basically the same thing as c#.

I haven't but I just solved it. int b = 0; needed to be declared outside of the loop because it reset b back to 0 every time it looped