Purdue CNIT 155 Midterm Exam (Python)

User Layer

End users, developers...

Applications Layer

Microsoft Office, Safari, Bkackboard

Operating Systems Layer

Windows 10, Mac OS, iOS, Android, Linux...

Computer Hardware Layer

Disks, RAM, Leyboard, Mouse...

Computer Programming

The process of translating an algorithm into instructions that a computer can understand

Programming Language

A formal constructed language designed to communicate instructions to a computer

True or False: There are thousands of programming languages in existence.

True

Guido van Rossum

Creator of Python

Which of the following is an example of an input device?

Mouse

High level programming languages include:

Python, Java, C, etc.

Examples of operating systems do NOT include:

Excel

T or F: System Software provides the real functionality of a computer, helping your computer do specific types of work.

false

Which of the following is an example of software?

WingIDE 101

T or F: A bit is the smallest unit of data in a computer.

True

T or F: Python is commonly used to create things like websites, games, and graphic interfaces.

True

Of the options below, which equal one gigabyte?

1024 Megabytes (MB)

What is Syntax?

Rules that say what programs look like, and how the statements in the programming language are formed

Which of the following is NOT a device to store data in a computer?

RAM

T or F: Python is considered a low-level language.

False

What piece of hardware connects all the components and devices of a computer?

Motherboard

A computer's "working memory" is its:

RAM

System Software is used for

Managing a computer's resources

How many bytes are in a kilobyte?

1024

T or F: A computer, is some cases, understands more than machine code.

False

Refers to the tangible part of a computer system

Hardware

Examples of application software includes all of the following, except:

Android

T or F: print() is an example of an input.

False

T or F: Python needs a main function to operate.

False

Which of the following is an example of an integer?

4

T or F: String values can never be converted to integer values.

false

Which of the following is true about an integer?

An integer can be stored as a variable

T or F: Boolean only has two possible values.

True

Which of the following is an example of a boolean value?

True

T or F: "Hello, World!" is a string

True

Which of the following displays a proper string literal?

ProgrammingDialogue = 'Coding in python is fun!'

Which of the following is an example of a comment in python?

# This is a comment in python

What is the name of the python function that tells you a class?

Type

T or F: A string is a numerical type of data.

False

What is the extension of the source file for a python program?

.py

Which of the following is a legal variable name?

studentname1

Rules of naming identifiers include the following, except:

Can include a space

T or F: Values cannot be converted from one type to another.

False

What is Semantics?

Rules that say what the program means

What is Machine Code?

Numbers treated as instructions by the CPU. EX: 05 01 23

What is Assembly Code?

Humanly readable way of writing machine code.
EX:
add EAX, 1
mov [ESP+4], EAX

When is Assembly code used?

In small devices where the size of code is important, in hardware specific code like device drivers, where performance is critical

T or F: High-level language can be translated into many different machine code languages for different processors.

True

What is a Source Program?

A program written in a high-level language

What is Interpreter?

Translates the statements and executes the statements in order

What is Compiler?

Translates statements in a language into machine code

What is IDE?

Integrated development environment that combines several programming tools together into one cohesive program

What is the structure of a Python Program?

def main ():
Indentation
and
blocks
main ();

T or F: Comments should say why you are doing something.

True

What is a String Literal?

A stream of characters enclosed in double quotes

What does \n do?

Inserts a new line in the output

What does \t do?

Inserts a tab

What does \\ do?

Displays \

What does \" do?

Displays "

What are the three phases of solving any problem?

Inputs, then Processing, then Outputs

What is the data in a program?

Data value, data types, data name, data conversion

What is Data Value?

A value is one of the fundamental things, like a word or a number, that a program manipulates

What is Data Type?

Data values can be classified into different classes

These are examples of numerical data types

Integers, Floating point numbers, complex numbers

These are examples of textual data types

String

These are examples of boolean data types

Bool (True/False)

What is a Variable?

A place holder in computer's RAM

T or F: Any inputted data is going to be considered as a String data (Regardless of what the user inputted).

True

What is a Statement?

An instruction that the Python interpreter can execute

What is a Expression?

A combination of values, variables, operators, and calls to functions

What is Operators?

Special tokens that represent computations like addition, multiplication, and division

What is Operands?

The values the operator works on

Addition operator

+ (2 + 5 = 7)

Subtraction operator

- (2 - 5 = -3)

Multiplication operator

* (2 * 5 = 10)

Division operator

/ (2 / 5 = 0.4)

Modulus operator

% (2 % 5 = 2)

Exponent operator

** (2 ** 4 = 16)

Floor Division operator

// (9 // 2 = 4)

T or F: Arithmetic operators are binary operators.

True

In the expression (17 * 9), the operator is:

*

In the expression (17 * 9), the operant is:

17 and 9

T or F: The Precedence Rules state that anything inside the ( ) gets evaluated first.

True

What is Built-in functions?

They are part of Python language, and there is no need for the programmer to import any library to use them

What is Library functions?

These are inside a special library, such as the Math library, Random library, graphics library, etc

What is User-defined functions?

Functions created and defined by the user

You can use the math library by typing:

import math

What are Bugs?

Programming errors

What is Debugging?

The process of tracking down bugs and correcting them

What is Syntax Errors?

Result from errors in code construction, such as mistyping a keyword, omitting a necessary colon, or using a wrong indentation.

The program does not run. You have to fix this before rerunning the program.

What is Logical Errors?

Occur when a program provides you with actual outputs that are different from the desired outputs.

The program runs but it gives wrong results.

What is Run-Time Errors?

Occur while an application is running where Python interpreter detects an operation that is impossible to complete.

The program runs, but it does not complete. The program crashes in the middle of running.

Who is the inventor of Boolean Algebra?

George Boole

If a string can not be converted, you get a:

Run-time error

T or F: The print() function returns a value.

False

What does sep= do?

Separates arguments without using a space

What does end= do?

Prints string after all the arguments have been printed

What is a Test Plan?

A table with a number of test cases

Things you should identify and test in a test plan are:

Normal cases, special cases, boundary cases, and error cases

What is Regression?

Returning to an earlier, usually lower or less desirable state

What type of program flow does python use?

Top-down