reserve a nos by using %

Question

int a=Integer.parseInt(t1.getText());
int b=0,c=0;
while(a>0)
{
c=a%10;
b=b*10+c;
a=a/10;
}
System.out. println(b)

explain what the value of b when program is executed and also every step how I get result and
explain how I check my program.......... please

Answer 1

first of all, add a semicolon in printing line.
Now, what u hve done is,
that parseint thing is to convert string taken frm command line and convert into integer..
store that in variable 'a'..suppose a=138..
untill 'a' is >0,
a(integer) is divided by 10 and remainder is stored in 'c'.
at that point,
b(0 initially), is mul by 10 and add with c.
and 'a' is again divided by 10, new value of 'a' is stored in 'a'(only integer part).
value of b after printing will be 831