What are the different return types in C++?
Just like there are many variable types, there are many different return types for functions. A function can return most data types we’ve covered, including double , int , bool , char , std::string , and std::vector .
How is C++ different from other languages?
C++ is an object-oriented programming language and includes classes, inheritance, polymorphism, data abstraction and encapsulation. C++ has a rich function library. C++ allows exception handling, and function overloading which are not possible in C. C++ is a powerful, efficient and fast language.
Why return type is used in C++?
The return type, which specifies the type of the value that the function returns, or void if no value is returned. In C++11, auto is a valid return type that instructs the compiler to infer the type from the return statement.
Can a function return multiple types C++?
While C++ does not have an official way to return multiple values from a function, one can make use of the std::pair , std::tuple , or a local struct to return multiple values.
How can a function return different data types in C++?
1. Create a data container (struct/class) containing the values you want to return. Then just update your function to return the class type rather than void and change your return value to return the class. This way you will be able to return all the data, but still only return one item.
What is return type function?
The result of a function is called its return value and the data type of the return value is called the return type. Every function declaration and definition must specify a return type, whether or not it actually returns a value.
What is the main difference between C++ and Java?
Similarities and Difference between Java and C++
| Parameters | Java | C++ |
|---|---|---|
| Compilation | Java is both Compiled and Interpreted Language. | C++ has only Compiled Language. |
| Memory Management | Memory Management is System Controlled. | Memory Management in C++ is Manual. |
| Virtual Keyword | It doesn’t have Virtual Keyword. | It has Virtual Keyword. |
Why is C++ unique?
Advantages of C++ unique() It has the pre-defined templates which are used for comparing elements and then removing all the elements one by one especially the duplicate elements to fetch the proper elements in a sequence.
What are the different return type of a function?
A return value can be any one of the four variable types: handle, integer, object, or string. The type of value your function returns depends largely on the task it performs.
Why is return used in C?
A return statement ends the execution of a function, and returns control to the calling function. Execution resumes in the calling function at the point immediately following the call. A return statement can return a value to the calling function.
How can a function return more than one value in C++?
We can return more than one values from a function by using the method called “call by address”, or “call by reference”. In the invoker function we will use two variables to store the results, and the function will take pointer type data. So we have to pass the address of the data.
Can a function return two different types?
So there are some practices you might be violating if your function can return multiple types. Knowing them will help you determine if your particular function should return multiple types anyway. Actually, it’s not very uncommon at all to return different types even in a statically typed language.
Is it possible to have different return types for different methods?
Strictly speaking, a method with different return type and the same signature is not possible. However, broadly speaking, there are many ways of implementing a method whose concrete run time return type varies. One is using generic parameters. Another is returning an interface or a super class with multiple implementations.
How to return a specific type of data from a function?
You can use templates, if you know what type to return before you call the function. But you can’t have a function, which internally decide to return some type. What you can do is to create a class which will be a container for returned data, fill object of this class with desired data and then return this object.
How can I return multiple data types from a class?
As an alternative to the template solution, you can have the function return a reference or a pointer to a class, then create subclasses of that class to contain the different data types that you’d like to return. RetrieveValue would then return a reference to the appropriate subclass.
What is the return type of the main function in C++?
The C++ standard explicitly says “It [the main function] shall have a return type of type int, but otherwise its type is implementation defined”, and requires the same two signatures as the C standard to be supported as options.