Structure of Procedural Programs

Question 1

State and describe the three main consturucts of procedural programming.

Answer 1

Itteration - Repeating the execution of code multiple times.

Selection- Only executing code based if certain conditions are true.

Sequence- executing instruction in order.

By - Liam Bradshaw

Question 2

Define recursion.

Answer 2

Recursion is when a fuction will call itself with updated parameters until the fuctions job is done.

By - Liam Bradshaw

Question 3

State the most common error that newer programers encounter when using recursion.

Answer 3

The mistake that many encounter is to not update the paramters (correctly) causing an infinte loop to occur where it will call itself over and over.

By - Liam Bradshaw

Question 4

Describe what a while loop and a repeat until loop is?

Answer 4

While loop - A while loop is a form of iteration in which the code iterates while a certain condition is being met e.g. while x<5.

Repeat Until loop - A repeat until loop is a form of iteration in which the computer iterates the code until a condition is met e.g. Repeat until x=5.

Question 5

State 1 difference between a While loop and a Repeat Until loop.

Answer 5

When using a While loop the condition is evaluated first, and if the condition is true, the code within the block is executed, whereas when using a repeat until loop the code is executed first and then the condition is evaluated, if the condition is true the code is executed again.