Example 1: C++ program for addition of numbers using a function
gd.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
godarda@gd:~$ g++ gd.cpp
godarda@gd:~$ ./a.out
15
godarda@gd:~$
Example 2: C++ program for addition of numbers using a function
gd.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
godarda@gd:~$ g++ gd.cpp
godarda@gd:~$ ./a.out
15
godarda@gd:~$
Comments and Reactions
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