An overloaded function is a function that has several implementations, the only difference being the number and type of parameters, including usage of the const keyword. Overloads cannot differ by return type alone. The following is a trivial example of function overloading.
const int & max(const int & lhs, const int & rhs){return( lhs>rhs ? lhs : rhs );}
const char & max(const char & lhs, const char & rhs){return( lhs>rhs ? lhs : rhs );}
Since the implementation is exactly the same, regardless of the type of parameters, it would make more sense to enlist the compiler to generate all the possible variants of this overloaded function using a template function. The compiler then generates all the overloads as required, and you only have one function to maintain.
Overloads are better suited to functions that have completely different signatures with a different number of parameters. For instance:
typedef struct rect_tag
{
float width;
float height;
} rect;
const float & Area( const rect & rc ){ return( rc.width * rc.height ); }
const int & Area( const int & width, const int & height ){ return( width * height ); }
const float & Area( const int & width, const float & height ){ return((float) width * height ); } const float & Area( const float & width, const int & height ){ return( width * (float) height ); }
The point of overloading functions is increased flexibility.You don't have to worry about which version of a function you call, nor is there any need to cast parameters to a specific type, since the compiler can work out which version of a function to call simply from the type of parameters you supply. If no suitable overload exists, the compiler will warn you so that you may either provide one, or explicitly cast your variables to a suitable version.
Mixing overloads with default parameter values increases the flexibility further, provided there is no ambiguity regarding which version of the overload is being called.
"Overloading" a function means that you have multiple functions with the same name, but different signatures. The signature of a function is its return type and number/types of parameters.
For example:
void foo(int a, char b)
can be distinguished from
void foo()
which can be distinguished from
void foo(double a)
which can be distinguished from
void foo(int a)
The program will call the correct function based off of the number and types of parameters it is given. So:
foo(1) will call the 4th example
foo(1.0) will call the 3rd example
foor() will call the 2nd example
and foo(1, 't') will call the 1st example
Note that MOST programming languages do not allow you to distinguish between function signatures by return type, thus:
void foo()
and
int foo()
is not allowed.
Function overloading should not be confused with function overriding. Overriding involves inheritance and is related to polymorphism.
JAVA is an Object Based Programming Language. it doesn't provide multiple inheritance and operator overloading. while Object Oriented Lanuages provides both.
There is no such thing as function overloading in C; that is a feature of C++. Function overloading allows us to provide two or more implementations of the same function. Typically, we use function overloading so that the same function can cater for different types. For instance, we might provide one implementation that is optimised to handle an integer argument while another is optimised to handle a real argument. We can also use function overloading to provide a common implementation of a function which can then be invoked by overloads that handle the low-level type conversions.
Function overloading is multiple definition with different signatures(the parameters should be different) for the same function. The parameter list have to be different in each definition. The compiler will not accept if the return type alone is changed. Operator overloading is defining a function for a particular operator. The operator loading function can not be overloaded through function overloading.
The only similarity is that both constructor and function overloads are distinguished by their signature -- the number and type of their arguments. Functions differ in that they also have a return type, which is also part of the signature, whereas constructors have no return type, not even void.
A template function is used when you want to write some kind of function that can be applied to different data types. It is a form of overloading, but you don't have to actually write all of the overloaded variants.
Defining several functions with the same name with unique list of parameters is called as function overloading.
JAVA is an Object Based Programming Language. it doesn't provide multiple inheritance and operator overloading. while Object Oriented Lanuages provides both.
No. Operator and/or function overloading is only a C++ thing.
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There is no such thing as function overloading in C; that is a feature of C++. Function overloading allows us to provide two or more implementations of the same function. Typically, we use function overloading so that the same function can cater for different types. For instance, we might provide one implementation that is optimised to handle an integer argument while another is optimised to handle a real argument. We can also use function overloading to provide a common implementation of a function which can then be invoked by overloads that handle the low-level type conversions.
1) Function 2) Which will excute particular methof/function
Function overloading is multiple definition with different signatures(the parameters should be different) for the same function. The parameter list have to be different in each definition. The compiler will not accept if the return type alone is changed. Operator overloading is defining a function for a particular operator. The operator loading function can not be overloaded through function overloading.
method overloading occurs when we use two functions or more with the same name.In function overloading compiler detect which method is call actually throw the parameters passed to the methods.In function overloading parameters of functions are different.
one function but multiple behaviours depending on the parameters
Function overloading is used when you want to re-use the same function name with different argument types or a different number of arguments. Calculating the area of a circle isn't the sort of function that requires overloading since the only argument you need is the radius. double area_of_circle (const double radius) { const double pi=4*atan(1); return pi*radius*radius; }
The only similarity is that both constructor and function overloads are distinguished by their signature -- the number and type of their arguments. Functions differ in that they also have a return type, which is also part of the signature, whereas constructors have no return type, not even void.
seekg sets the position of the get pointer in an input stream -- the point at which the next extraction will occur.