Unit-5 Name space- OOPs using C and C++ | BCA 3rd semester

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Unit-5

Namespace

• In C++, namespace is also used to organize- multiple classes so that it is easy to handle the application to access the class of namespace we need to use namespace name, class name.
• We can use it using keywords so that we do not have to use the full name all the time.

External Link–https://drive.google.com/file/u/0/d/1nqo7v5lecndDEO2HdIl2Yzje1NPRpKNt/view?usp=sharing&pli=1

Exception Handling

• Exception handling in C++ is a process of handling time and run errors. We perform exceptions to handle normal application flow to maintain the application even after errors. All exception classes in (+t) are derived from std::exception class. Let’s see the list of C++ common exception classes.

1. Logic Failure – This is an exception that can be detected by reading a code.
2. Runtime Error- This is an exception that cannot be detected by reading any code.
3. Bed Exception – It is used to resolve unexpected exception in C++ program.
   

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In C++ (++ handling keywords

•  Exception handling we use handling. 3 keywords exception to execute
• Try
• Cots
• Throwing
• C++ try/catch- exception execute wing C++ try block handling f/catch statement to hold on is wild. Code that exception may occur. 
• Try [] block – This captures the error message in any program at runtime and throws it into a catch block where the user can customize the error message.

Limitations of library functions

• As a programmer, we have no control over predefined functions. The implementation part is machine readable format.
• Whenever in the implementation any predefined function is not supporting the user

Necessary work

• Then go to User Defined

User-defined functions 

• These functions.
• For example- Suppose you want to create a function to add two numbers then you create a function named Sum. This type goes for user defined functions.

Defining a Function

• Return Type – A value that a function can iterate over. A return type is a value that a function can iterate over. The return type parameter and return statement are optional.
• Function Name – Function declaration is the process of telling the compiler about what the function returns.
• Parameters – A paramotor is like a place holder.  This value refers to the ordered type and number of parameters of a function. Parameters are optional i.e. a function can have a number of parameters.
• Function Body – The function body contains a collection of statements that define what the function does.
• Function Declaration – Function declaration tells the compiler about the function name and how to call the function. Syntax: return type functionName(parameter),
• Calling a function – When we call a function the control goes to function 55/73 and executes the entire code.