C++ Function Overloading

#include<iostream>
using namespace std;
int anik(int a, int b)
{
    int sum = a + b;
    return sum;
}
void anik(int a, int b, int c)
{
    int s = a - b + c;
    cout <<"Calculation :: " << s << endl;
}

int main()
{
    int a, b, c, d;

    cout << "Enter Three Number :: ";
    cin >> a >> b >> c;
    cout << endl;

    d = anik(a, b);
    cout << "Summation is :: " << d << endl << endl;

    anik(a, b, c);

    return 0;
}