Session-4 CSIT 121 Spring 2006

1
Session-4 CSIT 121 Spring 2006

• Debugging Tips
• Lab Work

2
Some Aspects of Visual Studio

• Your project can be set in Debug or Release
  configuration (Build-gtConfiguration Manager)
• In Debug state, you can apply several debugging
  options.
• Debug is set by default
• You can start debugging by invoking the debugger

3
Debugging Tips

• Let us try a few simple steps
• Open a new Win32 console project and copy and
  paste the following program into the editor
  window
• The compiler gives an error message
• Click on the error message
• The system moves the pointer to the line where
  the error is, press F1 to learn more

4
Program With an Error

• include ltiostreamgt
• using namespace std
• void main()
• double kpl,mpg, kpg
• const double CF1.6
• coutltlt"How many miles does your car cover in one
  gallon (MPG rating from the sticker)?"
• cingtgtmpg
• kpg mpgCF
• coutltlt"Your KPG rating is "ltltkpgltltendl
• kpl kpg/3.78
• coutltlt"Your KPL rating is "ltltkplltltendl

5
Starting the Debugger

• Once you have compiled the project, you can start
  the debugger by first inserting breakpoints
• A Breakpoint is where the program execution will
  halt
• Thus you can see the values of variables at that
  point

6
Using the Debugger

• Inserting breakpoints is a convenient way of
  stopping at a suspected problem location and
  examining the values of variables (Click the gray
  panel to the left of the program to insert a
  breakpoint)
• Click on Debug? Start
• Look at the bottom of the screen. You will find
  Autos on the left and call stack on the right
• Autos represents the variables. Look at the
  values. Which one is not assigned a value yet?
• Choose step over from the icons to avoid
  stepping into system functions

7
Directories

• Choose Tools?Options?Environment and change the
  project directory
• You can browse the Buildlog.htm file in the Debug
  folder to appreciate the automation of the linker

8
Lab Work (Part-D Due 2/2)

• Part-A
• Solve Prelab assignment on pages 31-32 of the lab
  course textbook. (Exercises 1,2,3,4,5)
• Check the solution and make any corrections
• The program source code is on the course website
  in the labs and lectures page
• Part-B
• Carry out all the four exercises in lesson 2-2 on
  page 34
• Part-C
• Do exercises 1,2,3 in Lesson 2-3 (page 35)
• Part-D
• Exercise 1 and 2 of Lesson 2-4 are due Thursday
  Feb 2