#include <iostream>
using namespace std;
void main()
{
int x = 10, y = 20;
Callfunc(x, y);
Callfunc(y);
}
void Callfunc(int Arg1, int Arg2 = 20)
{
Arg1 = Arg1 + Arg2;
cout << Arg1 << Arg2;
}
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