#include <iostream>
using namespace std;
void func(int a,int b, int c=3);
void func(int a,int b = 5, int c);
void func(int a = 10, int b, int c);
void func(int a, int b, int c)
{
cout << "a = " << a
<< " b = " <<b <<" c= " <<c <<endl;
}
int main()
{
func(20);
func(15,20);
func(15,20,30);
func(20,30);
func();
return 0;
}
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