Example 1: C++ program for addition of numbers using a function
kw.cpp
#include <iostream>
using namespace std;
int add(int a = 7, int b = 8)
{
    return a + b;
}
int main()
{
    cout<<add()<<"\n";
    return 0;
}
Output
kodingwindow@kw:~$ g++ kw.cpp
kodingwindow@kw:~$ ./a.out
15
kodingwindow@kw:~$
Example 2: C++ program for addition of numbers using a function
kw.cpp
#include <iostream>
using namespace std;
int add(int a, int b)
{
    return a + b;
}
int main()
{
    int i = 7, j = 8;
    cout<<add(i, j)<<"\n";
    return 0;
}
Output
kodingwindow@kw:~$ g++ kw.cpp
kodingwindow@kw:~$ ./a.out
15
kodingwindow@kw:~$
What Next?
C++ program for call by value and call by reference C++ program to add the members of two different classes using the friend function C++ program to demonstrate the use of math library functions
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