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Perfect! Now let’s tackle the first public method, display_balance, which we’ll use to display our current account balance.
Instructions
1.
Define a public display_balance method to your Account class. It should take a single parameter, pin_number.
The body of your method should check whether the pin_number is equal to pin (the result of calling the private pin method)
If it is, display_balance should puts "Balance: $#{@balance}."
Otherwise (else), it should puts pin_error (the pin_error message).
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