It is the process of defining, developing and designing systems which satisfies the specific needs and requirements of a business or organization. Description: A systemic approach is required for a coherent and well. To prevent incorrect operation of a software or system, debugging is used to find and resolve bugs or defects.
When various subsystems or modules are tightly coupled, debugging becomes harder as any change in one module ma. The waterfall model is a classical model used in system development life cycle to create a system with a linear and sequential approach.
It is termed as waterfall because the model develops systematically from one phase to another in a downward fashion. This model is divided into different phases and the output of one phase is used as the input of the next phase. Every phase has to be completed be.
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Open Source Definition: A software for which the original source code is made freely available and may be redistributed and modified according to the requirement of the user.
You must have Visual Studio installed and the. NET Core cross platform development workload installed. If you haven't already installed Visual Studio, go to the Visual Studio downloads page to install it for free.
The Visual Studio Installer launches. Choose the. NET Core cross platform development workload, then choose Modify. On the start window, choose Create a new project. Type console in the search box, select either C or Visual Basic as the language, and then choose Console App for.
NET Core. Choose Next. Choose either the recommended target framework or. NET 6, and then choose Create. If you don't see the Console App project template for. In Program. Select the correct language tab first, either C or Visual Basic. Our intent for this code is to display the galaxy name, the distance to the galaxy, and the galaxy type all in a list. To debug, it is important to understand the intent of the code.
Here is the format for one line from the list that we want to show in the output:. The app starts and there are no exceptions shown to us by the debugger. However, the output you see in the console window is not what you expect. Here is the expected output:. Looking at the output and at our code, we know that GType is the name of the class that stores the galaxy type. We are trying to show the actual galaxy type such as "Spiral" , not the class name!
With the app still running, set a breakpoint by clicking in the left margin next to the Console. WriteLine method call in this line of code. Because we see a problem in the output, we will start debugging by looking at the preceding code that sets the output in the debugger. The app pauses at the breakpoint that you set. The yellow highlighting indicates where the debugger is paused the yellow line of code has not yet executed.
Hover over the GalaxyType variable on the right, and then, to the left of the wrench icon, expand theGalaxy. So it is a good start that you can access this value in this code while running the app. In this scenario, we are using the incorrect API. We will see if we can fix this while running code in the debugger. In the same code, while still debugging, put your cursor at the end of theGalaxy. GalaxyType and change it to theGalaxy. Although you can make this change, the code editor shows you an error indicating it can't compile this code.
In Visual Basic, you won't see the error, and this section of code works. For debugging the Visual Basic example code, skip the next few steps until you're instructed to click the Restart button. Click Edit in the Edit and Continue message box. You see an error message now in the Error List window.
The error indicates that the 'object' doesn't contain a definition for MyGType. Even though we set each galaxy with an object of type GType which has the MyGType property , the debugger does not recognize the theGalaxy object as an object of type GType. What's going on? You want to look through any code that sets the galaxy type. When you do this, you see that the GType class definitely has a property of MyGType , but something isn't right. The error message about object turns out to be the clue; to the language interpreter, the type appears to be an object of type object instead of an object of type GType.
Looking through your code related to setting the galaxy type, you find the GalaxyType property of the Galaxy class is specified as object instead of GType. Now, when the debugger pauses on Console. WriteLine , you can hover over theGalaxy. MyGType , and see that the value is properly set. Only when all possibilities have been exhausted, should you consider "debugging" the Matlab core software. Two Notes: For this class you can always assume Matlab's code is correct. In such a case, the result of the Matlab function may well be "bad".
Using a debugger is usually a repetitive process. You write some code, run it, it doesn't work, so you debug it, fix something, run the debugger again, fix something, run the debugger again, etc. Debugging Programs A debugger is a program that allows you to step through another program one line at a time.
The Debugger The debugger is a program that can run your program one line at a time. What the debugger does for you The " power " of the debugger is that it lets you see the "state" of your program at any point and to advance through your program "step" one line at a time in the exact same manner that the code is being executed by the computer. In order to use the debugger you need to know about the following concepts: Current Line A computer can only do "one thing at a time".
Breakpoints Normally when you run a program, even in the debugger, it will start at the beginning of the program and run until completion or an error occurs. Stepping Stepping is the action of "telling the debugger" to advance through your program one line at a time. There are several ways you can tell the debugger to move through the code: Step or Step In Complete the next line of code. In Matlab : Step In is represented by the arrow between two pages In GDB : To step to the next line, or into a function, use: "step" or "s" Again, remember, if your arrow is at a function call, you will "enter" the code for the function and stop at the first line of the function.
Step Over Stepping over means to move to the next line of code in the current function. In Matlab: Step Over: use the button with an arrow by a single page. In GDB : type "next" or "n" Step Out If the current line of execution in the program is inside the code of a function and you want to "Finish It" complete all the rest of the code in the function , you can use the step out command. In Matlab: Step Out is the button with the arrow going up. In GDB: type "finish".
Continuing Execution of the Program giving control back to the computer The continue action tells the computer to "resume" the program moving forward through the program's code until another breakpoint is encountered or until the program ends. In Matlab: the continue command is the button with the straight down arrow.
In GDB: you will need to type "continue" or "c" for short. Exiting the Debugger Once you have used the debugger to find an error in your code you will want to: Fix the problem re-write your code Stop the current debugger session Perhaps put a breakpoint on the line you just presumably "fixed" Start a new debugger session to test your fix.
In Matlab: Click the downward arrow with red X over it. Showing the Value of a Variable Looking at the "state" of your program is VERY important for realizing if you are calculating and storing the correct data in your program.
The call "Stack" As your program enters more and more "Functions" when a function calls another function , a "Stack" of functions is created.
Debugging vs Running Remember, you only have access to the power of the debugger when you use the "debugger", which starts up when you hit "breakpoints" in your code.
Your Code Vs. The Debugging Session Using a debugger is usually a repetitive process. You will often use the following sequence of commands: Set a breakpoint Run the program via the debugger Look at the results of the variables associated with the current function. Look at the "state" of the program. If everything looks good: Decide that you need to keep going "Resume" the program The program will stop at another breakpoint or the same one.
Repeat from 3 above. If everything doesn't look good: Figure out what went wrong using your brain and the value of the variables Change the "offending" line of code Restart the debugging session from the start. If you fixed the problem, remove the current breakpoint, and continue further into your program. Back to Topics List.
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