C++ Code For Function Overloading

Example 1: Function Overloading by Number of Arguments

A C++ code having a Calculator class with function overloading (multiple add methods).
Here’s the full working program:

#include <iostream>
using namespace std;

// Calculator class demonstrating Function Overloading
class Calculator {
public:
    // Function to add two integers
    int add(int a, int b) {
        return a + b;
    }
    // Function to add three integers
    int add(int a, int b, int c) {
        return a + b + c;
    }
    // Function to add two doubles
    double add(double a, double b) {
        return a + b;
    }
};

int main() {
    Calculator calc;
    cout << "Sum of 2 and 3 (int): " << calc.add(2, 3) << endl;
    cout << "Sum of 2, 3 and 5 (int): " << calc.add(2, 3, 5) << endl;
    cout << "Sum of 2.5 and 3.5 (double): " << calc.add(2.5, 3.5) << endl;
    return 0;
}

Output : Sum of 2 and 3 (int): 5 

Sum of 2, 3 and 5 (int): 10 

Sum of 2.5 and 3.5 (double): 6

This is an ideal case of Function Overloading in C++ - the add function acts differently, depending on the arguments and quantity of the arguments.

Example 2: Function Overloading by Type of Arguments

A C++ code having Print class with function overloading (display function works for int, double, and string).

Here’s the full working program:

#include <iostream>
using namespace std;

class Print {
public:
    void display(int a) {
        cout << "Integer: " << a << endl;
    }
    void display(double d) {
        cout << "Double: " << d << endl;
    }
    void display(string s) {
        cout << "String: " << s << endl;
    }
};

int main() {
    Print p;

    p.display(10);        // Calls int version
    p.display(3.14);      // Calls double version
    p.display("Hello");   // Calls string version

    return 0;
}

Output:

Integer: 10

Double: 3.14

String: Hello

This is another good example of function overloading in C++.
In this case the name of the function display is the same, but the parameter type determines which one to call.

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