| Lesson 6 | Decision |
| Objective | Describe the decision construct. |
Decision Construct in Procedural Programming
Most programs have statements that are to be executed only under certain conditions. The decision[1] construct (also referred to as the selection construct) allows you to do this. For example, consider the following modified version of the GoForARide program:
Put on cycling clothes If the weather is cold Put on a jacket Put on tights Go for a ride Remove cycling clothes Take a shower
In this program the statements:
Put on a jacket Put on tights
are executed only when the weather is cold. This is indicated in the pseudocode by indenting these two statements beneath the decision statement:
If the weather is cold
In the next lesson we will look at the repetition construct.
Here is a flowchart for this program. Note how the decision construct allows us to modify the straight sequential flow of execution of a program.
Here is a flowchart for this program. Note how the decision construct allows us to modify the straight sequential flow of execution of a program.
[1]Decision: Control flow construct in which a task is performed conditionally. Also referred to as selection.