Private and Protected Example using friend function in C++

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This is a C++ program that demonstrates the use of friend classes to access private data members of another class. The program defines two classes, A and B. Class A has a private integer data member x initialized to 5, and class B is declared as a friend of class A. The program also defines a member function display in class B, which takes an object of class A as its argument and prints the value of its private data member x.

In the main function, the program creates an object of classA and an object of class B. The display function of class B is then called, passing the object of class A as an argument. The display function then accesses the private data member x of the object of class A using the friend declaration, and prints its value in the console.

Source Code

#include<iostream>
using namespace std;
class A
{
   int x =5;
   friend class B;
};
class B
{
  public:
    void display(A &a)
    {
       cout<<"value of x is : "<<a.x;
    }
};
int main()
{
  A a;
  B b;
  b.display(a);
  return 0;
}

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Output

value of x is : 5

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• C++ Introduction
• Hello World In C++
• Why we using namespace std in C++
• Getting Inputs in C++
• std::string class in C++
• if Statement in C++
• if else Statement in C++
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• Nested if Statement in C++
• Switch Statement in C++
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• Salary Calculation using IF Statement in C++
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• While Loop in C++
• do While Loop in C++
• For Loop in C++
• For Each Loop in C++
• Sum of N Numbers in C++
• Factors of a Given Number using C++
• Armstrong Number using C++
• Prime Number using C++
• Arrays in C++
• Search an Element in an array in C++
• Sum of Elements in an array in C++
• Greatest Elements in an array in C++
• Sort Elements in an array in C++
• Function In C++
• Function Overloading In C++
• Default Argument Function In C++
• Template In C++
• Enum In C++
• Class in C++
• What is Public Access Specifier in C++
• What is Private Access Specifier in C++
• Scope Resolution :: Operator in C++
• Default Constructor in C++
• Parametrized Constructor in C++
• Copy Constructor in C++
• Constructor Overloading in C++
• Destructor Overloading in C++
• Single Inheritance in C++
• Multiple Inheritance in C++
• Multilevel Inheritance in C++
• Hybrid Inheritance in C++
• Hierarchical Inheritance in C++
• Diamond Problem in C++
• Diamond Problem using Constructor in C++
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• Function Overriding in C++
• Operator Overloading in C++
• Unary Operator Overloading in C++
• Base Class Pointer derived Class Object in C++
• Virtual Function in C++
• Sample Virtual Function in C++
• Pure Virtual Function & Abstract Class in C++
• What is Abstraction in C++
• Getter & Setter , this Keyword in C++
• Static variables and Static Function in C++
• Friend Function in C++
• Friend Class in C++
• Change Private Values Using Friend Class in C++
• Single Value Member Initializer List in C++
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• Add value to Base Class Constructor Using Member Initializer List in C++
• Initialized Const variable using Member Initializer List in C++
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• Printing Given Word using Goto
• Printing Numbers using Goto
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• Print Reverse Tables using Goto

Break and Continue

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• Printing Numbers in C++
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While Loop

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• Decimal to Binary in C++
• Printing Even & Odd Numbers
• Printing Positive & Negative Numbers
• Prime between two Numbers
• Find Prime or Composite
• Printing Numbers in C++
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• Reverse Tables using While Loop

Do While Loop

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• Printing Array using Do While Loop
• Printing given Word
• Printing Numbers using Do While Loop

For Loop

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• Sum of Two Square using For Loop
• Alphabet Diamond Pattern
• Armstrong number using For Loop
• Cubic Numbers using For Loop
• Divisible by 7 using For Loop
• Fibonacci series using For Loop
• Formula Examples using For Loop
• Reverse Number Pattern
• Number Patterns using For Loop
• Odd & Even Numbers using For Loop
• Printing Star Diamond Pattern in C++
• Printing Flag Pattern in C++
• Printing Pyramid Pattern in C++
• Printing Boat Pattern in C++
• Diamond Pattern Outline in C++
• Square Pattern Outline in C++
• Triangle Pattern Outline in C++
• Printing Tables using For Loop
• Reverse table using For Loop
• Sum of Even & Odd using For Loop
• Squaring Numbers using For Loop
• Reverse Printing Number using in C++
• Prime or Composite using For Loop
• Common Patten Examples in C++

Friend Function in C++

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• Basic Friend Function Example
• Addition using Friend Function
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• Find Distance using Friend Function
• Length of Box using Friend Function
• Private & Protected Example in C++

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• Basic Example of String in C++
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• String Capacity Function in C++
• String Character Change in C++
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• String Length in C++
• String Palindrome in C++
• Remove Duplicate String in C++
• String Resize in C++
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• Print Values using Array
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Structure & Functions Examples

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• Difference between two Numbers in C++
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• Product of two Numbers in C++
• Check Prime Number using Function
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• Update Function in C++
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Hybrid Inheritance

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Multilevel Inheritance

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• Constructor Invoking Example
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Destructor Example

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Operator Overloading Example

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• Binary Operator Example
• Increment & Decrement Example
• Input & Output Example
• Relational Operator Distance Example
• Operator Overloading Example
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Operator and Function Example

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• Pointer to Classes in C++
• Data Hiding in C++
• Constructor Example in C++
• Copy Constructor in C++
• Scope Example in C++
• Inline Function in C++
• Struct vs Class in C++
• Operator Overloading in C++
• Friend Function in C++
• Insertion Overload in C++
• Inheritance Example in C++
• Single Inheritance in C++
• Access Specifier in C++
• Function Overriding in C++
• Runtime Polymorphism in C++
• Abstract Class in C++
• Friend Class in C++
• Static Member in C++
• Static Member Function in C++
• Nested or InnerClass in C++
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Virtual Function Examples

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