COMPUTER SCIENCE LOOP STRUCTURES

What are the three main programming structures?

• Sequence, selection, iteration

• Structured, object-oriented, procedural

• Java, Python, Visual Basic

• Machine, assembly, high-level

Which control structure will execute an instruction only after the computer evaluates conditions to determine if a certain condition exists?

• Selection
• Loop
• Functional
• Sequence

In programming, what is iteration?

• The repetition of steps within a program

• The order in which instructions are carried out

• A decision point in a program

• A terminating statement

Jackson has written a section of code in his program that instructs a character to move forward unless it encounters an obstacle, such as a rock. If the character encounters an obstacle, then it should change direction before moving forward again. If it does not encounter an obstacle, it should continue moving forward. Which type of control structure has Jackson written?

• Selection
• Loop
• Functional
• Sequence

Identify the control structure involved to this question.

A grocery store manager wants a program that allows the clerk to enter original price of an item and discount rate. The program then should display both the original and discounted price.

• Selection

• Sequence

• Iteration

• single-alternative ifs

What type of flowchart is shown here?

• selection
• iteration / loop
• sequence

Which of these activities are examples of following an algorithm?

• Playing a game of chess

• Baking a cake

• Playing a piece of sheet music on the piano

• Following directions from Google Maps

For which algorithm would it be best to use a conditional loop?

• Finding largest number in a list

• Calculating average of a list of numbers

• Counting occurrences of an item in a list

• Checking if an item is in a list

Which is the correct flowchart symbol for input/output?

• 
• 
• 
• 

The process by which a computer carries out the instructions of a stored program?

• Execution

• Running

• Compiling

• Interpreting