Repeating code using a loop

Looping is an essential part of any data manipulation. Same as the other programming languages, C/AL offers a variety of looping methods. The following recipe will help you understand how to use the FOR loop in C/AL code.

How to do it...

1. Let's start by creating a new codeunit from Object Designer.

2. Then add the following global variables:

   Name	Type
   n	Integer
   i	Integer
   Factorial	Integer

3. Now write the following code in the OnRun trigger of the codeunit:

   Factorial := 1;
   n := 4;
   FOR i := 1 TO n DO BEGIN
     Factorial := Factorial * i;
     MESSAGE('Factorial of %1 = %2', n, Factorial);
   END;

4. To complete the task, save and close the codeunit.

5. On execution of the codeunit, you should see a window similar to the following screenshot:

   

How it works...

A FOR loop has four parts: a counter, a starting value, the step to be taken, and an ending value. In this code, our counter variable is i. The starting value is 1 and the ending value is n, which in this case has been assigned...