1.15. Exercises

Q-1: What is the function of the secondary memory in a computer?

• Execute all of the computation and logic of the program
• This would be correct if we asked what the CPU does.
• Retrieve web pages over the Internet
• This would be correct if we asked what the client does.
• Store information for the long term, even beyond a power cycle
• The secondary memory provides long term storage, even if you turn off the computer.
• Take input from the user
• The secondary memory does not ask users for input.

Q-2: When talking about computers and code, which of the following is a program?

• A set of instructions for your computer and CPU.
• A program holds the instructions that answer the CPU's "What next" question.
• The process of creating and editing code.
• Programming is the process of creating and editing these instructions.
• An event that teaches you to write code.
• This can be a program, but not the kind we're talking about here.
• A question you ask your computer.
• While a program can ask your computer or the user a question, it typically answers the question of "what next" from your CPU.

Q-3: A __________ is a program that can analyze and execute a program line by line.

Q-4: Which of the following creates or contains “machine code”?

• The Python interpreter
• The interpreter translates python source code from a human readable form to machine code
• The keyboard
• The keyboard provides textual input
• A Python source file
• The Python source file contains human readable programs
• A word processing document
• A word processing document contains text

Q-5: Where in the computer is a variable such as “x” stored after the following Python line executes?

x = 123

• Central processing unit
• The CPU processses instructions
• Main Memory
• The main memory holds the values of the variables while a program executes
• Secondary Memory
• Secondary memory provides long-term storage. You must write out values to secondary memory to store them long-term.
• Input Devices
• Input devices do not store data
• Output Devices
• Ouptut devices do not store data

Q-6: What will the following program print out:

x = 43
x = x + 1
print(x)

• 43
• The value of x was changed.
• 44
• While x was set to 43 originally it was changed to one more than the current value.
• x + 1
• This would be true if the code was priInput devices do not store data
• Error because x = x + 1 is not possible mathematically
• This code sets the value of x to the current value of x plus 1.

Q-7: Pick the best replacements for 1 and 2 in the following sentence: When comparing compilers and interpreters, a compiler is like 1 while an interpreter is like 2.

• 1 = a process, 2 = a function
• Compiling is a software process, and running the interpreter is invoking a function, but how is a process different than a function?
• 1 = translating an entire book, 2 = translating a line at a time
• Compilers take the entire source code and produce object code or the executable and interpreters execute the code line by line.
• 1 = software, 2 = hardware
• Both compilers and interpreters are software.
• 1 = object code, 2 = byte code
• Compilers can produce object code or byte code depending on the language. An interpreter produces neither.

Q-8: A brain is the human equivalent to what in your computer?

Q-9: A keyboard is an example of an Input or Output device?

Q-10: A speaker is an example of an Input or Output device?

Q-11: The Python interpreter or complier will tell you if your code has a __________ Error.

Try running the following code. Can you tell what is wrong with it and fix it?

primt 'Hello world!'

# The print function is spelled incorrectly # and needs parentheses around its contents print('Hello world!')

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