Oops concepts variables and How to handle variable in testing
- 1. OOPS Concepts : Variable Presented by Nilesh Sawardekar
- 2. Variable Forget about programming, let’s consider some scenarios in real world. When we say “Object”, which things first come to your mind. Well, sudden question from me may confuse you. Now ask yourself which objects you have in your home. You may have chairs, sofa, TV, Washing Machine and lot more. Let’s take one object from things which you have at home, TV.
- 3. Can you tell me which Brand, Color, Model No., Size, Price of your TV? And also I like to know whether your TV is smart TV? Category: LED Brand: Samsung Color: Black Model No.: xyz Size: 55 inch Smart TV: Yes Price: 85,000 So, it means we can categories TV in Brand, Color, Model No., Size, Price, Smart_TV, right?
- 4. Let’s take universal example of TV, you can find TV in, • Brand: Samsung, Sony, Haier, Videocon, LG etc. • Color: Black, Silver, White, Red etc. • Model No.: 32LJ522D, 24LH454A, UN32J525DAFXZA etc. • Size: 26, 32, 42, 44, 55 etc • Smart_Tv: Yes, No • Price: 85000, 100000, 25000 etc Here, we say brand, color, model_no are alphanumeric. Size is numeric, price is decimal and smart_tv as Boolean.
- 5. In programming word alphanumeric, numeric, decimal and Boolean are called as datatype. Brand, Color, Model No., Size, Price, Smart_TV are Variables. Alphanumeric values are defined as “string”, numeric as int, decimal, float, money, double in programming world. Syntax for variable declaration is, <data_type> <variable_name>; We can initialize variables in following way and its value can be change later. string water_unit = “ltr”; int taksh_age = 3;
- 6. If you are tester • While doing Data Flow Testing, variables take important part. • Because, It mainly focuses on the points at which values assigned to the variables and the point at which these values are used by concentrating on both points, data flow can be tested. • Data flow testing uses the control flow graph to detect illogical things that can interrupt the flow of data. • So you would like to check things which are explained in next slide.
- 7. A variable that is declared but never used within the program. On most of IDE like Microsoft studio, you may find that few variables are declared but they are in gray color. When you take your cursor on it, message will pop up with “Variable never used.”
- 8. ▫ A variable that is used but never declared. This problem is most of time when we use multiple classes. For few compiler, ordering of classes do matters. ▫ A variable that is declared multiple times before it is used. Developers sometimes, declare same variable multiple times. This happen when code get lengthy. Most of time developers intialise same variable for multiple times. ▫ Deallocating a variable before it is used. This can be seen in array. Deallocation sometimes tends memory leak. So you have handle this very carefully.
- 9. ▫ Whether variables have given proper name. Most of the times project moves from one developer to other developer. This can be the case when junior submit code to senior or developer left the job and other developers handles it. So giving proper name to variable is very important. E.g., suppose there is variable with name student_name have to be declared. In this case if suppose developer XYZ, declare it as using his or her speaking language as vidyarthi_nav , and if this project is handed over to other developer ABC then that time ABC may not understand what is vidyarthi_nav . So, giving proper name to variable is more important. ▫ Whether variables have given proper data types. It’s very important to use proper data type for variables. Common mistakes are done when int values are declared as float or double. String is but char data type is enough.
- 10. Thank You • To learn, ▫ *Android*iOS*C#, C, C++*Asp .net MVC*SQL*PHP*Java*Advance Java*Javascript*Jquery*WCF*WPF*Angular JS*Python*React native ▫ Digital marketing and SEO on live projects. ▫ Microsoft CRM 365. You can contact me by call or What’s App on +91 9819991929 www.codewithnilesh.com
Editor's Notes
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