#include<iostream>

using namespace std;


int my_swap(int &a,int &b)
{
	int t = a;
	a = b;
	b = t;
}

int my_swap(float &a,float &b)
{
	float t = a;
	a = b;
	b = t;
}

int my_swap(string &a,string &b)
{
	string t = a;
	a = b;
	b = t;
}

int main()
{
	int i1 = 10,i2 = 20;
	my_swap(i1,i2);
	cout << "i1 = " << i1 <<", i2 = " << i2 << endl;

	float f1 = 12.1,f2 = 21.2;
	my_swap(f1,f2);
	cout << "f1 = " << f1 <<", f2 = " << f2 << endl;
	
	string s1 = "hello",s2 = "world";
	my_swap(s1,s2);
	cout << "s1 = " << s1 << ",s2 = " << s2 << endl;

	return 0;
}

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#include <iostream>

using namespace std;

extern int calc(int a = 10,int b=1,int c=3);


int main(void)
{
    cout << calc(10,100,200) << endl;
    return 0;
}

int calc(int a,int b,int c)
{
    return (a + b + c);
}


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