LOOP PROBLEM-not exiting do while loop

if(ch=='L')
{
do
{
System.out.println("Would u like to buy the Shirt");
System.out.println("Press 1 - yes , press 0 - no");
abc = Integer.parseInt(in.readLine());
count++;
System.out.println("Tell the amount");
amt=Double.parseDouble(in.readLine());
s_amt=s_amt+amt;
}
while(abc!=0);