Free Pascal Lazarus App Tutorial 8 - Simple Calculator Part 4 - Try Except Error Handling



The Simple Calculator, up to this point, crashes or comes up with confusing error messages, if a non-number is entered into the calculator.

We can make this situation more user friendly by using an error catching technique.

Using Try - Except can stabilize the program and tell the user what is happening if an error occurs.

Try Except Syntax

Try
  Statement
Except
  Statement
End;

Simple Calculator Tutorials

Tutorial 5 - Setting up the Form - Simple Calculator Part 1

Tutorial 6 - String Conversion - Simple Calculator Part 2

Tutorial 7 - RadioButtons - Simple Calculator Part 3

Tutorial 8 - Try Except Error Handling - Simple Calculator Part 4

Tutorial 9 - Tabs and Finished App - Simple Calculator Part 5

Code Download
SimpleCalculator.zip