Pascal Control Structures

Control Structures - Module 3

3. Control Structures

In Pascal you can split Control Structures into multiple groups, and to make it easier to understand I will do so.

Excuse that poorly drawn graphic, maybe eventually I'll substitute it for a better looking one. 

Condition or Selection group

These types of Control Structures decide to execute certain action from the actions programmed.

Loops and Cycles

These control structures repeat a set of instructions a determined amount of times or until a certain condition is met.

3.1. If... Then... Else;

IF {condition} THEN

 {instructions1}

ELSE

{instructions2};

In the program above, if certain condition is met program will execute instructions1 however if that criteria is not met instructions2 will be executed.

Consider this example:

As you can see the writeln('I am younger than you') has no ; this is intentional. If there are two or more statements, you need to use a begin...end block. 

Example:

There can be multiple conditions too, to do this use Else If...

Example:

This example also shows you how to use Jump instructions, we could easily do this with the other control structures, but to avoid confusion I did it like this.

If you encounter any problems, let me know.