Programming Appreciation

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					    Lecture 4
  Programming
   Technique

Programming Appreciation
 Finding and Fixing Errors

 • Syntax Errors
 • Run-Time Errors
 • Logic Errors




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Syntax Error




       Double-click anywhere on this line to jump to the error
            Syntax Error
1


    2       When the compiler
            identifies 確定 syntax
            errors, it cannot continue.
            Click No to return to the
            editor and correct the
            error.




        3
   Project Property Page Dialog




  • The default startup object if Form1
  • Using Project menu, Properties change the
    startup object to match the new name
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     Finding and Fixing Errors
• Run-Time Errors
 Pass syntax checking but fail to execute.
 e.g. divide by zero; square root of a negative number.
• Logic Errors
 Project runs but produces Private Sub btnSpanish_Click
 incorrect results.
 e.g. Incorrect calculation;
                             End Sub
 wrong text appears.


                                    Zero build errors means that you
                                    have a clean compile.
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Naming Rules: Name Property
• How the programmer refers to a control in
  code
• Name must begin with a letter
• Must be less than _________________long
• May include numbers and the underscore (_)
• Use appropriate __ character naming______

                                e.g. txtName,
                                lblName
 IntelliSense
Automatically pops up to give the programmer help.
Intellisense anticipates your needs during coding and
displays prompts to assist you in coding




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posted:10/9/2012
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