Computer Science preparatory

Computer Science

Preparatory

These are the main topics for the exam for programming:

These are the main types of variables in Python. For the exam, you will use the basic ones which are.

Integers, Float and strings.

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Types of variables

These are helpful to ask the user-specific information for the machine to answer, depending the instruction.

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Inputs and outputs

conditionals are statements that allow the program to make decisions and execute different blocks of code depending on whether certain conditions are true or false.

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Conditionals

​In Python, there are several math operators that are used to perform arithmetic operations on numbers. These operators include Addition, subtraction, multiplication, and division.

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Math operators

A flowchart is a graphical representation of a process or algorithm that shows the sequence of steps involved and the flow of control between them.

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​Flowcharts

Multiple Choice

What will the output be from the following code? print(3+4)

• 5

• 4

• 7

• 2

Multiple Choice

Numbers with a decimal point belong to a data type called...

• Decimal

• Float

• Pointing

• String

Multiple Choice

Which of the following text strings is correct?

• new_var = "Tim/'s Computer"

• new_var = "Tim's Computer"

• new_var = "Tim\'s Computer"

• new_var = Tim's Computer

Multiple Choice

Which of the following is not a string?

• new_var = "True"

• new_var = "3.123"

• new_var = "3123"

• new_var = False

Multiple Choice

Which of the following is a float?

• new_var = 1234

• new_var = 1.234

• new_var = True

• new_var = "True"

Multiple Choice

Choose the statement that assigns 4 to the power of 3 to the variable new_var...

• new_var = 4 ** 3

• new_var = 3 ** 4

• new var = 3 ** 4

• new_var = 4 ^^ 3

Multiple Choice

To create a variable named new_var and assign it a value of 81 divided by 9, which statement would you use?

• new_var = 81 \ 9

• new_var = "81 \ 9"

• new_var = "81 / 9"

• new_var = 81 / 9

Multiple Choice

Which symbol do we use if we want to add a comment to our code?

• &

• %

• #

• @

Multiple Choice

How would would you print a text string?

• output "Hello!"

• print (Hello!)

• print ("Hello!")

• output (Hello!)

Multiple Choice

How would you assign an integer to a variable?

• new_var = 4

• new_var = "4"

• new_var == 4

• new var "4"

Multiple Choice

How would you output new_var = 123 as a text string?

• print str(new_var)

• print str[new_var]

• print new_var.str

• print (new_var).str()

Multiple Choice

What does an IF statement do?

• Closes the program

• Asks a question

• Makes a decision

• Outputs information

Multiple Choice

What is a flowchart?

• Just another diagram

• A list of instructions

• A diagram to represent an algorithm

• All the options

Multiple Choice

What is the input/output symbol in flowcharts?

• A circle

• A rhombus

• A rectangle

• A parallelogram

Multiple Choice

This symbol SPLITS the flowchart sequence into multiple paths in order to represent SELECTION and REPETITION.

• Input/Output

• Start/End

• Decision

• Arrows

Multiple Choice

Which of the following Python operators is used for variable assignment?

• =

• /

• +

• -