reference c 2b 2b

1// function definition to swap the values.
2void swap(int &x, int &y) {
3   int temp;
4   temp = x; /* save the value at address x */
5   x = y;    /* put y into x */
6   y = temp; /* put x into y */
7  
8   return;
9}

1int& r = i;
2

1#include <iostream>
2using namespace std;
3
4// function declaration
5void swap(int &x, int &y);
6
7int main () {
8   // local variable declaration:
9   int a = 100;
10   int b = 200;
11 
12   cout << "Before swap, value of a :" << a << endl;
13   cout << "Before swap, value of b :" << b << endl;
14
15   /* calling a function to swap the values using variable reference.*/
16   swap(a, b);
17
18   cout << "After swap, value of a :" << a << endl;
19   cout << "After swap, value of b :" << b << endl;
20 
21   return 0;
22}

1Value of i : 5
2Value of i reference : 5
3Value of d : 11.7
4Value of d reference : 11.7
5

1#include <iostream>
2 
3using namespace std;
4 
5int main () {
6   // declare simple variables
7   int    i;
8   double d;
9 
10   // declare reference variables
11   int&    r = i;
12   double& s = d;
13   
14   i = 5;
15   cout << "Value of i : " << i << endl;
16   cout << "Value of i reference : " << r  << endl;
17 
18   d = 11.7;
19   cout << "Value of d : " << d << endl;
20   cout << "Value of d reference : " << s  << endl;
21   
22   return 0;
23}