AP Computer Science Principles Unit 3 Review

ASCII is a character-encoding scheme that uses a numeric value to represent each character. For example, the uppercase letter “G” is represented by the decimal (base 10) value 71. A partial list of characters and their corresponding ASCII values are shown in the table above.

ASCII characters can also be represented by binary numbers. According to ASCII character encoding, which of the following letters is represented by the binary (base 2) number 1010100?

• N

• P

• T

• W

Which of the following decimal (base-10) values is equivalent to the binary (base-2) value 101001?

• 22

• 37

• 41

• 82

What value does the above code segment display?

• 17

• 36

• 53

• No value is ever displayed because the algorithm repeats the REPEAT UNTIL block indefinitely.

The above procedure check is called in a program after each time a True or False question is answered. If the user types in True True False True as their answers for four questions on a quiz, what should their overall score be?

• 25%

• 50%

• 75%

• 100%

ASCII is a character-encoding scheme that uses 7 bits (8 bits if you are using the extended ASCII table) to represent each character. The decimal (base 10) values 65 through 90 represent the capital letters A through Z, as shown in the table above.

Which ASCII character is represented by the binary (base 2) number 1000001?

• A

• B

• C

• D

Sort the following numbers, that are written in different bases, in numerical order from smallest to largest:

2548 AE16 101011012

• 
• 
• 
• 

Which of the following decimal values, when converted to binary (ignore leading zeros) have exactly 3 zeros in them?

Select two answers.

• 20

• 30

• 40

• 50