Programming Constructs (from BBC and Craig 'n' Dave)

What three building blocks are used when designing algorithms?

• Sequencing, programming, iteration

• Sequencing, selection, iteration

• Sequencing, selection, programming

What is sequencing? (Choose 2 answers)

• The order in which steps are carried out in an algorithm

• The order in which we think computationally

• The process of repeating a number of steps in an algorithm

• Executing one instruction after another

Why is sequencing important?

• To ensure the algorithm is kept to a reasonable length

• To ensure the algorithm functions as intended

• To ensure the algorithm is efficient

What might happen if the sequence is wrong?

• The algorithm may be overly long

• The algorithm may be inefficient

• The algorithm may produce unexpected results

What is selection? (Choose 2 answers)

• A set of steps to follow

• A path through a solution

• A decision

• A program branch depending on a condition

Why is selection important?

• Selection allows us to include more than one path through a solution

• Selection allows us to repeat steps in a solution

• Selection allows us to make our solution more efficient

Which of the instructions IF, THEN and ELSE represents a question?

• IF

• THEN

• ELSE

Which of the instructions IF, THEN and ELSE points to what to do if the answer to the question is FALSE?

• IF

• THEN

• ELSE

Which of the instructions IF, THEN and ELSE points to what to do if the answer to the question is TRUE?

• IF

• THEN

• ELSE

True or False?... The classic IF/THEN/ELSE statement has two possible outcomes... However, if we want to program more than two outcomes, we can use ELSE-IF, or ELIF statements.

• True

• False