Difference Between Function and Method

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Function: A Function is a reusable piece of code. It can have input data on which it can operate (i.e. arguments) and it can also return data by having a return type. It is the concept of procedural and functional programming languages.

Method: The working of the method is similar to a function i.e. it also can have input parameters/arguments and can also return data by having a return type but has two important differences when compared to a function.

A method is associated or related to the instance of the object it is called using.
A method is limited to operating on data inside the class in which the method is contained.
It is a concept of object-oriented programming language.

In simple words if a function is part of an instance of a class i.e. (Object) then it is called method else it is called function.

Function	Method
It is called by its own name/independently.	It is called by its object’s name/referenced.
As it is called independently it means the data is passed explicitly or externally.	As it is called dependently which means the data is passed implicitly or internally.

Implementation of Function in Procedural Programming Language(C):

C

// C program to demonstrate a Function
 
#include <stdio.h>
 
// Declaration of function
int func()
{
  printf("\n FUNCTION"); // statement
}
 
int main()
{
    func(); // calling of function
    return 0;
}

Implementation of Function in Object Oriented Programming Language(JAVA):

Java

/* a method is similar in working to function but it belongs
 or is associated with the instance of a class i.e. object
 */
 
import java.io.*;
 
// Declaration of class
class demo {
    public int method()
    {
        System.out.println("METHOD");
        return 0;
    }
}
class GFG {
    public static void main(String[] args)
    {
        demo test = new demo();
        test.method(); // here you can see method belongs to
                     // instance of a class named demo and is
                     // called using object(test) of a
                     // class(demo), so it is a method
    }
}