i'm doing a pascal programming. It's about a simple ATM. The problem is when I have to make a pin checking program. What i'm thinking is...If we put the right pin, it will run the next program [the transaction program]. But if we put the false pin, it will repeat the checking program until we put the right pin , but if we put false pin until 3 times, there will be a warning like 'We already blocked your card'...Somebody can help me???