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C++ | Define a class method outside the class definition

Here, we are going to learn how to define a class method outside the class definition in C++ programming language?
Submitted by IncludeHelp, on February 21, 2020 [Last updated : March 01, 2023]

Defining a class method outside the class definition

In the below program, we are creating a C++ program to define a class method outside the class definition.

C++ program to define a class method outside the class definition

/* C++ program to define a class method 
    outside the class definition*/

#include <iostream>
using namespace std;

// class definition
// "Sample" is a class
class Sample {
public: // Access specifier
    // method declarations
    void printText1();
    void printText2();
    void printValue(int value);
};

// Method definitions outside the class
// method definition 1
void Sample::printText1()
{
    cout << "IncludeHelp.com\n";
}

// method definition 2
void Sample::printText2()
{
    cout << "Let's learn together\n";
}

// method definition 3
// it will accept value while calling and print it
void Sample::printValue(int value)
{
    cout << "value is: " << value << "\n";
}

int main()
{
    // creating object
    Sample obj;

    // calling methods
    obj.printText1();
    obj.printText2();
    obj.printValue(101);

    return 0;
}

Output

IncludeHelp.com
Let's learn together
value is: 101

See the above code, there are three methods printText1(), printText2() and printValue() which are declared inside the class definitions and methods are defining outside the class definition using Scope Resolution Operator (::).