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Project Debugging

Project Debugging. Compile Errors: The compile time error occurs when we break the syntax rules or misspell a keyword. Use a wrong object method or property e.g if(y<x) Msgbox(“y is lesser than x”) Else Msgbox(“x is lesser than y”). Run Time Errors.

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Project Debugging

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  1. Project Debugging • Compile Errors: • The compile time error occurs when we break the syntax rules or misspell a keyword. • Use a wrong object method or property • e.g if(y<x) • Msgbox(“y is lesser than x”) • Else • Msgbox(“x is lesser than y”)

  2. Run Time Errors • If our project halts during execution it is a run time error • Run time errors can be caused by exceptions and wrong object reference • E.g divide by 0

  3. Logic Errors • With logic errors the program runs but produce incorrect results.

  4. Design Time • The time during which we build an application in the IDE • In the development enviornment by Adding controls ,changing property settings etc.

  5. Break mode • The temporary suspension of the program execution in the development enviornment. • In the break mode we can examine,debug ,reset or continue program execution.

  6. The reasons for entering a break mode • Encountering a break point during progrtam execution. • Press ctrl+break during program execution. • Encounter an untrapped run time error during program execution. • Add a break when watch expression is true

  7. Step Into • Executes one statement at a time. • It executes the statements at the current execution point • If the statement is a call to the procedure the next statement displayed is • The first statement of the called procedure.

  8. Step Over • Similar to step into. • The difference in use occurs when the statement is a call to the procedure. • Step over executes the procedures as a unit . • The next statement displayed is the next statement in the current procedure regardless of the fact that the current statemnt is a call to another procedure or not.

  9. Step out • Execute the remaining lines of function or procedure in which the current execution point lies. • It then enters run time.

  10. Go • Executes the code from the current statement until a breakpoint is encountered • Or the end of the program is reached.

  11. Validation • Checking to verify that appropriate values • have been entered as inputs to the controls is called validation.

  12. Isnumeric function • To check the data entered is numeric or not we use the isnumeric function. • The isnumeric(x) retiurns true if the data is number else false.

  13. Multiple forms • A project can contain multiple forms. • The multiple forms can be added from the project menu ->add form sub menu. • Hide method:The hide method conceals the form from the screen. • Show method :Shows the form on the screen.

  14. Show method • There sre two intrin\sic constants for the show method. • Vbmodeless:0 • Vbmodal:1

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