an integer number between 0 and 99. With just 6 question. to guess correctly!!!

6 Question of me. ( numbers is 13 )

Computer: Is your number bigger than 50?

User: No

Computer: Is your number bigger than 25?

User: No

Computer: Is your number bigger than 12?

User: Yes

Computer: Is your number bigger than 18?

User: No

Computer: Is your number bigger than 15?

User: No

Computer: Is your number bigger than 13?

User: No

Computer: your number is 13, right?

User: Absolutely right. Exactly right. You are genius computer.

Error: numbers 14??

Who can do other algorithms??? Help me!!!