NOCTI Computer Science Practice Test 3

What is the first step in designing a solution to a programming problem?

• Write the code immediately

• Identify inputs, processes, and outputs

• Run test cases

• Debug the algorithm

Which tool is most commonly used to represent the flow of logic before coding?

• Flowchart

• Database

• Binary Tree

• Logic gate diagram

In pseudocode, what does the keyword IF indicate?

• Start of a loop

• Start of a decision structure

• Declaration of a variable

• End of a program

Why will this code not run?

• there has to be a number in the variable

• there are supposed to be no spaces in the variable label

• there are no caps in variables

A short password protection program is being written.

The user enters “let me in” as the password but the program crashes.

Why does the program crash when the correct password is entered?

• password is set to be entered as a real value while the password is a string

• The password is too long

• TRUE and FALSE have been mixed up

• The password should be a real number

Answer explanation

The data types for the input and the password must be the same. Passwords are always stored as strings as they can contain a mix of keyboard symbols, letters and numbers.

Variable

• An extra piece of information that you pass to the function to customize it for a specific need.
• The common programming structure that implements "conditional statements".
•  Attributes that describe an object's characteristics
•  A placeholder for a piece of information that can change.

The next two questions use a robot in a grid of squares. The robot is represented as a triangle, which is initially facing up, towards the top of the grid. The robot is moved according to the instructions in the chart above.

Consider the following program which uses commands from the pseudocode described above.

REPEAT 4 TIMES {

MOVE_FORWARD()

MOVE_FORWARD()

MOVE_FORWARD()

ROTATE_RIGHT()

MOVE_FORWARD()

ROTATE_RIGHT()

MOVE_FORWARD()

ROTATE_RIGHT()

}

Which of the following images shows the path and ending location of the robot that will result from executing the code above. The starting location of the robot is shown as dotted triangle for cases where the robot does not start and end at the same location.

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Adil wrote code to control a toy robot. Adil was ___________ the computer to move round the room.

• Programming

• Shaping

• Colouring

• Drawing

Which of the following will your robot not do if you run this code?

• Make sounds

• Change colors multiple times

• Move forward

• Display the word go

The code segment below is intended to move a robot in a grid to a gray square. The program segment uses the procedure GoalReached, which evaluates to true if the robot is in the gray square and evaluates to false otherwise. The robot in each grid is represented as a triangle and is initially facing left. The robot can move into a white or gray square but cannot move into a black region.

For which of the following grids does the code segment NOT correctly move the robot to the gray square?

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