Write a program in c to swap two numbers using friend function

Standard input makes it convenient for us to write programs that process arbitrary amounts of input and to interact with our programs; standard draw makes it possible for us to work with graphics; and standard audio adds sound.

Friend Functions The private member data of a class can be accessed only by member functions of that class. Well, there is one exception. A friend function will be friendly with a class even though it is not a member of that class and can access the private members of the class.

It gets the width and height using dot: If we do this inside main, we get an error because they are private members and we can't access them outside of the class. But friend function to the class can access the private members. But what's the point of friend functions. In the above example, we could have made "display" as a member function of the class instead of declaring it as a friend function to the class.

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Why do we need friend functions? A friend function can be friendly to 2 or more classes. The friend function does not belong to any class, so it can be used to access private data of two or more classes as in the following example.

Generally, the use of friend functions is out of an object-oriented programming methodology, so whenever possible it is better to use members of the same class to perform operations with them as in the following example getting exactly same output.

Friend functions are not members of any class but they can access private data of the class to which they are a friend. Because they are not members of any class, you should not call them using the dot operator.

Friend Classes Just like functions are made friends of classes, we can also make one class to be a friend of another class. Then, the friend class will have access to all the private members of the other class. Where friends have access to your private members. Sponsor Open Source development activities and free contents for everyone.Write a C++ Program to Swap two numbers using call by value.

Here’s simple C++ Program to Swap two numbers using call by value in C++ Programming Language. The private member data of a class can be accessed only by member functions of that class.

Well, there is one exception. A friend function will be friendly with a class even though it is not a member of that class and can access the private members of the class. But what's the point of friend. Easy Tutor author of Program to illustrate the use of default argument function is from United ashio-midori.com Tutor says.

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C program to perform basic arithmetic operations which are addition, subtraction, multiplication, and division of two numbers. Numbers are assumed to be integers and will be entered by a user. In C language when we divide two integers we get an integer as a result, for example, 5/2 evaluates to 2.

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6 marks Solve any one question fromQ.5(a,b,c) and Q.6(a,b,c) 5(a) Write a C++ program to swap two numbers using concept of function template.